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  Subjects -> ENGINEERING (Total: 2246 journals)
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ENGINEERING (1191 journals)            First | 1 2 3 4 5 6 | Last

Showing 401 - 600 of 1205 Journals sorted alphabetically
IET Optoelectronics     Hybrid Journal   (Followers: 1)
IET Radar, Sonar & Navigation     Hybrid Journal   (Followers: 24)
IET Renewable Power Generation     Hybrid Journal   (Followers: 9)
IET Science, Measurement & Technology     Hybrid Journal   (Followers: 2)
IET Signal Processing     Hybrid Journal   (Followers: 14)
IETE Journal of Research     Open Access   (Followers: 8)
IETE Technical Review     Open Access   (Followers: 6)
IIE Transactions     Hybrid Journal   (Followers: 2)
Implementation Science     Open Access   (Followers: 13)
Indian Journal of Biotechnology (IJBT)     Open Access   (Followers: 2)
Industrial Data     Open Access   (Followers: 1)
Industrie et Technologies     Full-text available via subscription   (Followers: 17)
Informatik-Spektrum     Hybrid Journal   (Followers: 1)
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Ingenius : Revista de Ciencia y Tecnología     Open Access  
Innovare : Revista de ciencia y tecnología     Open Access  
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
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Intelligent Control and Automation     Open Access   (Followers: 6)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Interface Science and Technology     Full-text available via subscription  
Intermetallics     Hybrid Journal   (Followers: 23)
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International conference KNOWLEDGE-BASED ORGANIZATION     Open Access  
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 3)
International Journal for Numerical Methods in Engineering     Hybrid Journal   (Followers: 29)
International Journal for Numerical Methods in Fluids     Hybrid Journal   (Followers: 19)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 2)
International Journal for the History of Engineering & Technology     Hybrid Journal   (Followers: 7)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
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International Journal of Aerodynamics     Hybrid Journal   (Followers: 16)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 16)
International Journal of Air-Conditioning and Refrigeration     Hybrid Journal   (Followers: 7)
International Journal of Antennas and Propagation     Open Access   (Followers: 9)
International Journal of Applied Ceramic Technology     Hybrid Journal   (Followers: 7)
International Journal of Applied Power Engineering     Open Access   (Followers: 4)
International Journal of Architectural Computing     Full-text available via subscription   (Followers: 4)
International Journal of Automation and Control Engineering     Open Access   (Followers: 2)
International Journal of Automotive Technology and Management     Hybrid Journal   (Followers: 5)
International Journal of Autonomic Computing     Hybrid Journal   (Followers: 1)
International Journal of Autonomous and Adaptive Communications Systems     Hybrid Journal   (Followers: 4)
International Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
International Journal of Bifurcation and Chaos     Hybrid Journal   (Followers: 2)
International Journal of Biomedical and Clinical Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Biomedical Imaging     Open Access   (Followers: 5)
International Journal of Cast Metals Research     Hybrid Journal  
International Journal of Circuit Theory and Applications     Hybrid Journal   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Collaborative Engineering     Hybrid Journal  
International Journal of Combinatorics     Open Access   (Followers: 1)
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International Journal of Computer Applications in Technology     Hybrid Journal   (Followers: 3)
International Journal of Control Science and Engineering     Open Access   (Followers: 5)
International Journal of Control, Automation and Systems     Hybrid Journal   (Followers: 12)
International Journal of Corrosion     Open Access   (Followers: 10)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 7)
International Journal of Design Engineering     Hybrid Journal   (Followers: 14)
International Journal of Digital Multimedia Broadcasting     Open Access   (Followers: 5)
International Journal of Education and Management Engineering     Open Access   (Followers: 2)
International Journal of Education Economics and Development     Hybrid Journal   (Followers: 3)
International Journal of Embedded Systems     Hybrid Journal   (Followers: 5)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription   (Followers: 1)
International Journal of Energy Optimization and Engineering     Hybrid Journal   (Followers: 3)
International Journal of Engine Research     Hybrid Journal   (Followers: 1)
International Journal of Engineering & Technology     Open Access   (Followers: 4)
International Journal of Engineering and Manufacturing     Open Access   (Followers: 1)
International Journal of Engineering Education     Full-text available via subscription   (Followers: 6)
International Journal of Engineering Management and Economics     Hybrid Journal   (Followers: 3)
International Journal of Engineering Mathematics     Open Access   (Followers: 2)
International Journal of Engineering Pedagogy     Open Access  
International Journal of Engineering Practical Research     Open Access  
International Journal of Engineering Research in Africa     Full-text available via subscription   (Followers: 1)
International Journal of Engineering Science     Hybrid Journal   (Followers: 6)
International Journal of Engineering Systems Modelling and Simulation     Hybrid Journal   (Followers: 8)
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Social Justice, and Peace     Open Access   (Followers: 5)
International Journal of Environmental Engineering     Hybrid Journal   (Followers: 6)
International Journal of Experimental Design and Process Optimisation     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 35)
International Journal of Flow Control     Full-text available via subscription   (Followers: 5)
International Journal of Foresight and Innovation Policy     Hybrid Journal   (Followers: 7)
International Journal of Fracture     Hybrid Journal   (Followers: 11)
International Journal of Geo-Engineering     Open Access  
International Journal of Geotechnical Engineering     Hybrid Journal   (Followers: 5)
International Journal of Grid and Utility Computing     Hybrid Journal  
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 31)
International Journal of Heat and Mass Transfer     Hybrid Journal   (Followers: 135)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 6)
International Journal of Hypersonics     Full-text available via subscription   (Followers: 4)
International Journal of Imaging Systems and Technology     Hybrid Journal   (Followers: 1)
International Journal of Impact Engineering     Hybrid Journal   (Followers: 9)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 5)
International Journal of Innovation Science     Full-text available via subscription   (Followers: 9)
International Journal of Innovative Technology and Research     Open Access   (Followers: 1)
International Journal of Integrated Engineering     Open Access  
International Journal of Intelligent Engineering Informatics     Hybrid Journal  
International Journal of Intelligent Systems and Applications in Engineering     Open Access   (Followers: 2)
International Journal of Lifecycle Performance Engineering     Hybrid Journal   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Research     Hybrid Journal   (Followers: 6)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 8)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 8)
International Journal of Mathematics in Operational Research     Hybrid Journal  
International Journal of Medical Engineering and Informatics     Hybrid Journal   (Followers: 3)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 4)
International Journal of Mobile Network Design and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Multiphase Flow     Hybrid Journal   (Followers: 4)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 5)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 2)
International Journal of Navigation and Observation     Open Access   (Followers: 19)
International Journal of Network Management     Hybrid Journal   (Followers: 1)
International Journal of Nonlinear Sciences and Numerical Simulation     Hybrid Journal  
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (Followers: 9)
International Journal of Optics     Open Access   (Followers: 3)
International Journal of Organisational Design and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (Followers: 6)
International Journal of Pavement Engineering     Hybrid Journal   (Followers: 4)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 4)
International Journal of Plasticity     Hybrid Journal   (Followers: 6)
International Journal of Plastics Technology     Hybrid Journal   (Followers: 1)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 6)
International Journal of Polymer Science     Open Access   (Followers: 22)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (Followers: 6)
International Journal of Precision Engineering and Manufacturing-Green Technology     Hybrid Journal  
International Journal of Precision Technology     Hybrid Journal  
International Journal of Pressure Vessels and Piping     Hybrid Journal   (Followers: 17)
International Journal of Production Economics     Hybrid Journal   (Followers: 13)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 5)
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Quantum Information     Hybrid Journal   (Followers: 2)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 11)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 9)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 4)
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (Followers: 3)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Service Science, Management, Engineering, and Technology     Full-text available via subscription   (Followers: 1)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal   (Followers: 2)
International Journal of Social Robotics     Hybrid Journal   (Followers: 2)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 3)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 4)
International Journal of Speech Technology     Hybrid Journal   (Followers: 7)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (Followers: 12)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 5)
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International Journal of Thermal Sciences     Hybrid Journal   (Followers: 13)
International Journal of Thermodynamics     Open Access   (Followers: 8)
International Journal of Turbo & Jet-Engines     Hybrid Journal   (Followers: 3)
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 4)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 6)
International Journal of Vehicular Technology     Open Access   (Followers: 4)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (Followers: 3)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal   (Followers: 1)
International Journal on Artificial Intelligence Tools     Hybrid Journal   (Followers: 5)
International Nano Letters     Open Access   (Followers: 6)
International Review of Applied Sciences     Open Access  
International Review of Applied Sciences and Engineering     Full-text available via subscription  
International Scholarly Research Notices     Open Access   (Followers: 173)

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Journal Cover Engineering Analysis with Boundary Elements
  [SJR: 1.251]   [H-I: 52]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0955-7997
   Published by Elsevier Homepage  [3039 journals]
  • Three-dimensional BEM analysis of stress state near a crack-borehole
           system
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Dmitry V. Nikolskiy, Mattia Zammarchi, Sofia G. Mogilevskaya, Alberto Salvadori
      The paper presents a numerical study of the three-dimensional problem of cracks interacting with a cylindrical uniformly pressurized borehole. The theoretical developments describe general case in which the axis of the borehole can be inclined to the vertical direction, the cracks are either located outside of the borehole or emanate from it, and the in-situ stresses are uniform with major principal stress acting in vertical direction. The tractions are prescribed at the cracks surfaces that includes two limiting cases of traction-free cracks (“fast pressurization”) or cracks subjected to uniform load equal to that applied at the surface of the borehole (“slow pressurization”). The study is based on the complex integral representations for the three-dimensional fields around the borehole-crack system. The boundary surfaces are approximated using triangular mesh and quadratic polynomials are employed for approximating the boundary unknowns. The prescribed boundary conditions are met using “limit after discretization” procedure. The linear algebraic system to find the unknowns is set up by the collocation method. Two numerical benchmarks are presented.

      PubDate: 2016-09-27T13:59:01Z
       
  • A generalized beta finite element method with coupled smoothing techniques
           for solid mechanics
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): W. Zeng, G.R. Liu, C. Jiang, T. Nguyen-Thoi, Y. Jiang
      This paper presents a generalized smoothing techniques based beta finite element method (βFEM) to improve the performance of standard FEM and the existing smoothed finite element methods (S-FEM) in solid mechanics. As we know, the edge-based (for 2D) or face-based (for 3D) strain smoothing techniques can bring much more accurate solutions than standard FEM, and offer lower bounds for force driven problems. The node-based smoothing technique with “overly-soft” feature, on the other hand has a unique property of producing upper bound solutions. This work proposes a novel generalized S-FEM with the smoothing domains generated based on both edges/faces and nodes. An adjustable parameter β is introduced to control the ratio of the area of edge/face-based and node-based smoothing domains. It is found that nearly exact solutions in strain energy can be obtained by tuning the parameter, making use of the important property that the exact solution is bonded by the solutions of NS-FEM and ES/FS-FEM. Standard patch tests are likewise satisfied. A number of numerical examples (static, dynamic, linear and nonlinear) have shown that the present βFEM method is found to be ultra-accurate, insensitive to mesh quality, temporal stable, capable of modeling complex geometry, immune from volumetric locking, etc.

      PubDate: 2016-09-23T13:41:43Z
       
  • A piecewise partitioning Scaled Boundary Finite Element algorithm to solve
           viscoelastic problems with cyclic symmetry
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Chongshuai Wang, Yiqian He, Haitian Yang
      Scaled Boundary Finite Element Method (SBFEM) and a temporally adaptive algorithm are combined to solve viscoelastic problems. By expanding variables at a discretized time interval, a spatially and temporally coupled viscoelastic problem is decoupled into a series of recursive spatial problems, which are solved by SBFEM, the computing accuracy in the time domain is controlled via a self-adaptive process. For the cyclic symmetric structures, the cyclic symmetry is exploited to reduce the computational expense of SBFEM, both the eigenvalue and system equations of SBFEM are partitioned into a number of smaller independent problems, which are solved by a partitioning algorithm. Two numerical examples are given to verify and illustrate the proposed approach.

      PubDate: 2016-09-23T13:41:43Z
       
  • Dynamic pressure distributions of semi-submersible
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Ke Wang, Xiaowei Gao, Xiaoming Cheng
      In the hydrodynamic study of Semi-submersibles, the wave pressure distribution on the wetted surface is critical input for structure analysis. Based on wave radiation and diffraction theory, a higher-order boundary element method (HOBEM) was applied to calculate the wave pressure distribution for a semi-submersible under specified wave direction and frequency. An integral system containing the FEM modeling of the semi-submersible, numerical calculation of hydrodynamic motion coefficients and data extraction and export for BEM analysis was established in the current study. A newly developed multiple and double nodes relocation method coupled with FEM-BEM model transformation is applied to remove the singularities along the sharp edges and corners of the semi-submersible. The numerical results confirm that the above algorithm significantly improves the numerical accuracy of wave pressure analysis for the semi-submersible.

      PubDate: 2016-09-23T13:41:43Z
       
  • Flows in slip-patterned micro-channels using boundary element methods
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Chandra Shekhar Nishad, Anirban Chandra, G.P. Raja Sekhar
      In this study we investigate steady, pressure-driven, two-dimensional flow of Newtonian fluid through slip-patterned, rectangular channels in the low Reynolds number limit. The slip flow regime is modeled using the Navier's slip boundary condition. In this work, we present only in-phase patterned slip. Subsequently, based on the characteristic length of the patterning, we have considered two subcases, namely large and fine patterned slip. Boundary element method (BEM) is used to numerically solve Stokes equation and obtain the streamline profiles. Streamlines, velocity profiles, pressure gradients, and shear stresses are analyzed to gain a proper understanding of the flow mechanics.

      PubDate: 2016-09-19T13:19:31Z
       
  • Heat conduction analysis by adaptive iterative BEM-FEM coupling procedures
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): D. Soares, L. Godinho
      This work explores the application of coupled numerical models in thermal conduction analysis, taking into account frequency domain formulations. For this purpose, iterative coupling techniques between the Boundary Element Method (BEM) and the Finite Element Method (FEM) are discussed, also considering adaptive discretization procedures. Two coupling approaches are studied here, both using optimal relaxation parameters to ensure and/or to speed up the convergence of the iterative analysis. Non-matching discretizations on the common interfaces of the different subdomains of the model are allowed, and a single iterative cycle is adopted, incorporating both the adaptive and the coupling processes simultaneously. The methodology is quite flexible, and the possibility of using independent discretizations on each subdomain greatly facilitates the use of enhanced adaptive remeshing; in this context, specialized adaptive techniques for each subdomain/methodology may be applied. The adoption of a single iterative loop also renders a very efficient methodology, avoiding the excessive computational costs of sequentially chained iterative cycles. Numerical examples are presented in the end of the paper, illustrating the good performance of the proposed techniques, as well as their potentialities in engineering applications.

      PubDate: 2016-09-19T13:19:31Z
       
  • Automated hybrid singularity superposition and anchored grid pattern BEM
           algorithm for the solution of inverse geometric problems
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Marcus W. Ni, Alain J. Kassab, Eduardo Divo
      A method for solving an inverse geometric problem is presented by reconstructing the unknown subsurface cavity geometry with the boundary element method (BEM) and a genetic algorithm in combination with the Nelder-Mead non-linear simplex optimization method. The heat conduction problem is solved by the BEM which calculates the difference between the measured temperature at the exposed surface and the computed temperature under the current update of the unknown subsurface flaws and cavities. In a first step, clusters of singularities are utilized to solve the inverse problem and to identify the location of the centroid(s) of the subsurface cavity(ies)/flaw(s). In a second step, the reconstruction of the estimated cavity(ies)/flaw(s) geometry(ies) is accomplished by utilizing an anchored grid pattern upon which cubic spline knots are restricted to move in the search for the unknown geometry. The solution is achieved using a genetic algorithm accelerated with the Nelder-Mead non-linear simplex method. The automated algorithm successfully reconstructs single and multiple subsurface cavities within two dimensional mediums. The cavity detection was enhanced by applying multiple boundary condition sets (MBCS) to the same geometry. This extra information supplied on the boundary made the subsurface cavity easily detectable despite its low heat signature effect on the boundaries.

      PubDate: 2016-09-19T13:19:31Z
       
  • Mixed miscible-immiscible fluid flow modelling with incompressible SPH
           framework
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Gourabananda Pahar, Anirban Dhar
      A divergence-free Incompressible Smoothed Particle Hydrodynamics (ISPH) framework is developed for modelling multifluid immiscible/miscible flows. The numerical model considers Navier-Stokes equation along with scalar-transport equation to represent flow characteristics. Pure divergence free ISPH algorithm is used to solve Navier-Stokes momentum equation. Scalar transport equation is solved based on the nature of the fluid particles represented in terms of colour indicator (ϕ). Fixed ghost particles are utilized for simulating slip boundary. Proposed model is validated against three analytical/experimental results: (a) immiscible Rayleigh-Taylor Instability (b) lock-exchange non-Boussinesq flow (c) miscible gravity current with low density ratio. The model can capture Kelvin-Helmholtz instabilities generated at the interface. the framework is capable of capturing density-dependent flow with low to high density ratio alike. The capability of the developed model in general multifluid system is demonstrated for two cases (a) miscible multimode Rayleigh-Taylor Instability and (b) mixed miscible-immiscible fluid flow simulation.

      PubDate: 2016-09-19T13:19:31Z
       
  • A new dual reciprocity hybrid boundary node method based on Shepard and
           Taylor interpolation method and Chebyshev polynomials
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Fei Yan, Xia-Ting Feng, Jia-He Lv, Peng-Zhi Pan, Shao-Jun Li
      A new dual reciprocity hybrid boundary node method (DHBNM) is proposed in this paper, in which the Shepard and Taylor interpolation method (STIM) and Chebyshev polynomials interpolation are proposed. Firstly, the Shepard interpolation is used to construct zero level shape function, and the high-power shape functions are constructed through the Taylor expansion, and through those two methods, no inversion is needed in the whole process of the shape function construction. Besides, Chebyshev polynomials are used as the basis functions for particular solution interpolation instead of the conical function, radial basis functions, and the analytical solutions of the basic form of particular solutions related to Chebyshev polynomials for elasticity are obtained, by means of this method, no internal node is needed, and interpolation coefficients can be given as explicit functions, so no inversion is needed for particular solution interpolation, which costs a large amount of computational expense for the traditional method. Based on those two methods, a new dual reciprocity hybrid boundary node method is developed, compared to the traditional DHBNM, no inversion is needed for both shape function construction and particular solution interpolation, which greatly improves the computational efficiency, and no internal node is needed for particular solution interpolation. Numerical examples are given to illustrate that the present method is accurate and effective.

      PubDate: 2016-09-19T13:19:31Z
       
  • Domain decomposition scheme with equivalence spheres for the analysis of
           aircraft arrays in a large-scale range
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Ting Su, Mengmeng Li, Rushan Chen
      we propose a domain decomposition scheme for solving scattering problem from multi-objects distribution in a large-scale range. Each sub-object is enclosed by an equivalence sphere. The scheme is composed of the equivalence process and translation process. In the equivalence process, the scattering fields from the sub-object are produced by the equivalence mode currents on the equivalence sphere. The equivalence mode currents are the current expansion of the body of revolution (BoR) basis functions, which are transformed from the current expansion of the Rao–Wilton-Glisson (RWG) basis functions. The multilevel fast multipole algorithm (MLFMA) is employed to accelerate the equivalence process. In the translation process, the mode translation matrices are obtained based on the BoR basis functions and the coordinate conversion method for computing the interactions among the equivalence spheres. The adaptive cross algorithm (ACA) is used to accelerate the evaluation of mode translation matrices. The proposed approach is very efficient for analysis of the objects distributed in a large-scale range. Numerical results demonstrate that the approach provides significant improvements in terms of memory requirements.

      PubDate: 2016-09-08T12:28:29Z
       
  • On deterministic-stochastic time domain study of dipole antenna for GPR
           applications
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): D. Poljak, S. Antonijevic, S. Sesnic, S. Lallechere, K. El Khamlichi Drissi
      A deterministic-stochastic transient study of Ground Penetrating Radar (GPR) dipole antenna radiating in a presence of a two-media configuration is carried out in the paper. A deterministic direct time domain formulation is based on the corresponding space-time Hallen integral equation. The numerical solution is carried out via the improved space-time variant of the Galerkin-Bubnov Indirect Boundary Element Method (GB-IBEM). The Stochastic-Collocation (SC) method is then applied to determine accurate confidence intervals due to the random variations of GPR input parameters. Once obtaining the current along the dipole antenna, it is possible to calculate other parameters of interest for GPR dipole antenna behavior, such as the field reflected from the interface of two media, or the field transmitted into a lower half-space. Some illustrative numerical results for the transient current along the dipole antenna and transient electric field transmitted into the lower half-space are given.

      PubDate: 2016-09-08T12:28:29Z
       
  • Using the Gaussian function to simulate constant potential anodes in
           multiobjective optimization of cathodic protection systems
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): W.J. Santos, J.A.F. Santiago, J.C.F. Telles
      The purpose of this work is to numerically find the optimum location of constant potential anodes to ensure complete structure surface protection using a cathodic protection technique. The existence of sacrificial anodes is originally introduced through the boundary conditions of the corresponding boundary value problem (BVP). However, if constant potential galvanic regions are introduced through its boundaries, then finding their optimal location is not an easy task due to the necessity of redefining boundary geometric nodes and the arrangement of virtual sources for the standard method of fundamental solutions (MFS) formulation. Therefore, in this work, the galvanic anodes are introduced as source terms using a Gaussian function. Hence, the boundary remains the same for different anode positions. The optimization process includes the identification of the following parameters characterizing the Gaussian function: the optimum coordinates of the centre of the anode, a factor that involves the inherent potential of the electrode and a proportionality factor for the electrode diameter. The MFS methodology coupled with a genetic algorithm presented good results for this multiobjective optimization procedure. This fact can be seen in the several results of applications that are discussed in this paper, considering numerical simulations in finite regions in R 2.

      PubDate: 2016-09-08T12:28:29Z
       
  • Analysis of the inherent instability of the interpolating moving least
           squares method when using improper polynomial bases
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Xiaolin Li, Qingqing Wang
      This paper first discusses the inherent instability of the interpolating moving least squares (IMLS) method. In the original IMLS method, non-scaled polynomial bases are used. Theoretical and numerical results indicate that the stability of the original IMLS method decreases as the separation distance decreases. Then, using shifted and scaled polynomial bases, a stabilized algorithm of the IMLS method is proposed and analyzed. As an application, the stabilized IMLS method is finally introduced into the meshless Galerkin boundary node method (GBNM) to produce a stabilized GBNM for potential problems and Stokes problems. Numerical examples are given to demonstrate the stability and convergence of the presented stabilized algorithms.

      PubDate: 2016-09-08T12:28:29Z
       
  • A linear complementarity formulation of meshfree method for elastoplastic
           analysis of gradient-dependent plasticity
    • Abstract: Publication date: December 2016
      Source:Engineering Analysis with Boundary Elements, Volume 73
      Author(s): Guiyong Zhang, Yong Li, Haiying Wang, Zhi Zong
      This work presents a linear complementarity formulation for elastoplastic analysis of the gradient-dependent plasticity including large deformation problems. The formulation is based on the meshfree smoothed radial point interpolation method, where the parametric variational principle (PVP) is used in the form of linear complementarity and the gradient-dependent plasticity is represented by the linearization of yield criterion. The yield stress is linearly evolved through equivalent plastic strain as well as its Laplacian (namely second gradient). The global discretized system equations are transformed into a standard linear complementarity problem (LCP), which can be solved readily using the Lemke method. The proposed approach is capable of simulating material hardening/softening and strain localization. An extensive numerical study is performed to validate the proposed method and to investigate the effects of various parameters. The numerical results demonstrate that the proposed approach is accurate and stable for the elastoplastic analysis of 2D solids with gradient-dependent plasticity on strain localization.

      PubDate: 2016-09-03T12:17:14Z
       
  • Numerical solution of a non-classical two-phase Stefan problem via radial
           basis function (RBF) collocation methods
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Mehdi Dehghan, Mahboubeh Najafi
      The aim of this paper is to make a comparative study of some high order methods for the numerical solution of a non-classical one-dimensional two-phase Stefan problem. The moving boundary is captured explicitly via boundary immobilization method. The Chebyshev and Legendre spectral collocation methods as high order mesh-based techniques and some radial basis function (RBF) collocation techniques as high order meshless methods are used for spatial discretization. The considered Stefan problem has two stages: one before the extinction time ( 0 ≤ t ≤ t m ) and one after the extinction time ( t m ≤ t ) . For this particular model there exists a closed form solution for the former stage but there is no analytical solution for the latter one. Numerical results show that RBF-QR method can attain the accuracy of spectral methods when implemented on Chebyshev grid. The high order accuracy for the two stages shows the superiority of the proposed methods in comparison to the previous works.

      PubDate: 2016-08-30T11:58:00Z
       
  • Complete solutions at or near the boundary nodes of boundary elements for
           coupled stretching-bending analysis
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): H.W. Chang, Chyanbin Hwu
      In boundary element analysis if the field point is located at or near the boundary nodes, its associated integrals may become singular. Although in the literature the displacements and tractions at the boundary nodes have been well solved for the coupled stretching-bending analysis, their related strains and stresses still remain unsolved due to the coincidence of field points and boundary nodes. In this paper to avoid the singular problem, at the boundary nodes the components of stress resultants, bending moments, in-plane strains and plate curvatures in the tangential direction are approximated by finite difference method, whereas the components in normal direction are evaluated with the aid of constitutive laws for the tangential-normal coordinate. After getting the complete solutions at the boundary nodes, the solutions for the points near the boundary are interpolated by the moving least square method. To verify the correctness of the proposed method, examples of the laminated plates with or without holes subjected to in-plane tension, or out-of-plane bending, or transverse loading are illustrated and compared with the solutions obtained by the other methods.

      PubDate: 2016-08-30T11:58:00Z
       
  • Forced vibration analysis of functionally graded beams by the meshfree
           boundary-domain integral equation method
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Y. Yang, C.C. Lam, K.P. Kou
      Forced vibration of two-dimensional functionally graded beams is studied in this paper by a developed meshfree boundary-domain integral equation method. Material properties of the functionally graded beams are assumed varying continuously either in longitudinal or transvers direction following the exponential function. The boundary-domain integral equations are derived by using the elastostatic fundamental solutions based on the two-dimensional elastic theory. Radial integral method (RIM) is employed to transform the domain integrals into boundary integrals. A meshfree scheme is achieved through assuming the displacements and accelerations in the domain integrals by a combination of the radial basis function and polynomials with time dependent coefficients. Wilson-θ, Houbolt as well as two kinds of damped Newmark's algorithms are applied to accomplish the time integration. The forced vibration of the functionally graded beam subjected by the harmonic loading and transient loading are investigated in detail. Numerical examples demonstrate that the four mentioned time integral schemes are all adapted well to the developed meshfree boundary-domain integral equation method for analyzing the forced vibration of homogeneous structures. For the analysis of FG structures, it is shown that the damped Newmark's algorithm can achieve more stable and accurate results.

      PubDate: 2016-08-30T11:58:00Z
       
  • A fully smoothed finite element method for analysis of axisymmetric
           problems
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Detao Wan, Dean Hu, Gang Yang, Ting Long
      A fully smoothed finite element method is developed to model axisymmetric problems by incorporating a special integral into the Cell-based, Node-based and Edge-based Smoothed Finite Element Method (CS-FEM, NS-FEM, ES-FEM), respectively. The special integral is done by combining Gauss divergence theorem with the evaluation of an indefinite integral, which can be used for treatment of the axisymmetric term in strain matrix and shape function in mass matrix. Applying the special integral and smoothing technique, all the domain integrals in stiffness matrix and mass matrix can be smoothed and rewritten as boundary integrals of smoothing cells. Then the stiffness matrix and mass matrix of element are computed by a simple summation over the smoothing cells. In this work, the proposed method is extended to static and structure dynamic analysis of axisymmetric problems. Numerical examples show that the proposed method can yield good performance even for extremely irregular elements.

      PubDate: 2016-08-26T13:22:53Z
       
  • Three-dimensional fracture propagation with numerical manifold method
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Yongtao Yang, Xuhai Tang, Hong Zheng, Quansheng Liu, Lei He
      By introducing the concept of mathematical cover and physical cover, the numerical manifold method (NMM) is able to solve continuous and discontinuous problems in a unified way. In this paper, the NMM is developed to analyze three dimensional (3D) fracture propagation. The maximum tensile stress criterion is implemented to determine whether the fracture will propagate and the direction of fracture propagation. Three benchmark problems are analyzed to validate the present algorithm and program. The numerical results replicate available experimental results and existing numerical results. The present algorithm and 3D NMM code are promising for 3D fracture propagation. They deserve to be further developed for the analysis of rock mechanic problems in which the initiation and propagation of multiple fractures, tensile and shear fractures, and fracture propagation under compressive loading are taken into account.

      PubDate: 2016-08-26T13:22:53Z
       
  • Crack analysis by using the enriched singular boundary method
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Ji Ma, Wen Chen, Ji Lin
      In this paper, we make the first attempt to extend the singular boundary method to crack problems in conjunction with the domain decomposition technique. In order to characterize singular behaviors around cracks, enriched functions are analytically derived from the governing equations and the corresponding conditions containing singularities. We verify the present enriched singular boundary method to the torsion problem of a cracked bar and the acoustic propagation problem in crack media, which are governed by Laplace and Helmholtz equations, respectively. Numerical results demonstrate the accuracy and efficiency of the proposed scheme.

      PubDate: 2016-08-21T13:11:53Z
       
  • More accurate results for nonlinear generalized
           Benjamin-Bona-Mahony-Burgers (GBBMB) problem through spectral meshless
           radial point interpolation (SMRPI)
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Elyas Shivanian, Ahmad Jafarabadi
      In this article, the spectral meshless radial point interpolation (SMRPI) technique is applied to the nonlinear generalized Benjamin-Bona-Mahony-Burgers (GBBMB) in two-dimension with initial and Dirichlet-type boundary conditions. This method is based on erudite combination of meshless methods and spectral collocation techniques. The point interpolation method with the help of radial basis functions is used to construct shape functions which play as basis functions in the frame of SMRPI. To treat the nonlinearity part, a kind of predictor-corrector scheme combined with Crank-Nicolson technique is adopted. We prove that the time discrete scheme is stable respect to the time variable in H 1 and convergent with convergence order O ( δ t ) . To show the high accuracy of SMRPI, a comparison study of the present method and recently applied interpolating element-free Galerkin technique is given through applying on GBBMB equation. The results reveal that the method is more accurate and possesses low complexity.

      PubDate: 2016-08-21T13:11:53Z
       
  • Analysis of underwater acoustic scattering problems using stable
           node-based smoothed finite element method
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Yingbin Chai, Wei Li, Tianyun Li, Zhixiong Gong, Xiangyu You
      A stable node-based smoothed finite element method (SNS-FEM) is presented that cures the “overly-soft” property of the original node-based smoothed finite element method for the analysis of underwater acoustic scattering problems. In the SNS-FEM model, the node-based smoothed gradient field is enhanced by additional stabilization term related to the gradient variance items. It is demonstrated that SNS-FEM provides an ideal stiffness of the continuous system and improves the performance of the NS-FEM and FEM. In order to handle the acoustic scattering problems in unbounded domain, the well known Dirichlet-to-Neumann (DtN) boundary condition is combined with the present SNS-FEM to give a SNS-FEM-DtN model for exterior acoustic problems. Several numerical examples are investigated and the results show that the SNS-FEM-DtN model can achieve more accurate solutions compared to the NS-FEM and FEM.

      PubDate: 2016-08-17T18:03:24Z
       
  • Crack propagation in non-homogenous materials: Evaluation of mixed-mode
           SIFs, T-stress and kinking angle using a variant of EFG Method
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): N. Muthu, S.K. Maiti, B.G. Falzon, Wenyi Yan
      A new variant of the Element-Free Galerkin (EFG) method, that combines the diffraction method, to characterize the crack tip solution, and the Heaviside enrichment function for representing discontinuity due to a crack, has been used to model crack propagation through non-homogenous materials. In the case of interface crack propagation, the kink angle is predicted by applying the maximum tangential principal stress (MTPS) criterion in conjunction with consideration of the energy release rate (ERR). The MTPS criterion is applied to the crack tip stress field described by both the stress intensity factor (SIF) and the T-stress, which are extracted using the interaction integral method. The proposed EFG method has been developed and applied for 2D case studies involving a crack in an orthotropic material, crack along an interface and a crack terminating at a bi-material interface, under mechanical or thermal loading; this is done to demonstrate the advantages and efficiency of the proposed methodology. The computed SIFs, T-stress and the predicted interface crack kink angles are compared with existing results in the literature and are found to be in good agreement. An example of crack growth through a particle-reinforced composite materials, which may involve crack meandering around the particle, is reported.

      PubDate: 2016-08-12T17:41:09Z
       
  • A direct velocity-pressure coupling Meshless algorithm for incompressible
           fluid flow simulations
    • Abstract: Publication date: November 2016
      Source:Engineering Analysis with Boundary Elements, Volume 72
      Author(s): Andrés Vidal, Alain J. Kassab, Eduardo A. Divo
      A localized radial-basis function (RBF) Meshless algorithm, with a direct velocity-pressure coupling scheme, is presented for fluid flow simulations. The proposed method is a combination of several efficient techniques found in different Computational Fluid Dynamic (CFD) procedures and has very low numerical diffusion. The fundamental idea of this method lays on several important inconsistencies found in three of the most popular techniques used in CFD, segregated procedures, streamline-vorticity formulation for 2D viscous flows, and the fractional-step method, very popular in Direct Numerical Simulation (DNS) and Large-Eddy Simulation (LES). The proposed scheme uses the classical segregated point distribution for all primitive variables, and performs all necessary interpolations with the accurate RBF technique. The viscous term is estimated using standard second order finite differences, while the convection term is discretized using the low-diffusion flux limiters. The velocity-pressure coupling is performed with the flow equations in their original form, and using a direct velocity-pressure coupling scheme. This way of solving the flow equations has no approximations in the boundary conditions. The method is validated with the 2D lid-driven cavity problem and very good agreement is found with classical data.

      PubDate: 2016-08-12T17:41:09Z
       
  • Sub-regions without subdomain partition with boundary elements
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Carlos Friedrich Loeffler, Webe João Mansur
      This paper presents a simple and effective numerical procedure to model domains with sectorial heterogeneous properties using the boundary element method. The physical problem is divided into a complete homogenous domain and other non homogeneous sectors. Matrices similar to the standard H boundary element matrix are constructed for each sector, which are related to the energy stored in them. The assembly of the coefficients related to the sectorial matrices in the final boundary element system is done through the direct introduction of unknown variables at internal auxiliary points. Comparatively to the sub-regions technique, the proposed procedure is advantageous, since the effect of interface approximations is attenuated and computer implementation of its corresponding numerical model is simpler.

      PubDate: 2016-08-08T17:26:11Z
       
  • Single layer regularized meshless method for three dimensional Laplace
           problem
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Lin Liu, Hong Zhang
      The subtraction and adding-back technique for Regularized Meshless Method (RMM) has been proposed by Young et al. (2005) [8] on 2-D Laplace problem and extended to 3-D Laplace problem by Young et al. (2009) [13], where the kernel functions of double layer potentials were adopted to desingularize fundamental solution singularity while the source points are overlapped on the physical points. Here the Single Layer Regularized Meshless Method (SRMM) is proposed. The solutions are represented by single layer potential. The singularity of the fundamental solution is desingularized by the carefully chosen particular solution in the null-fields of the boundary integral equation using the subtraction and adding-back technique for the Dirichlet boundary condition. The double layer potential is adopted for the Neumann boundary condition. The numerical examples show that the convergence trend and accuracy of the SRMM are better than those of using other methods (RMM, IBDS) by one or two orders of magnitude.

      PubDate: 2016-08-08T17:26:11Z
       
  • Interior field methods for Neumann problems of Laplace's equation in
           elliptic domains, comparisons with degenerate scales
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Zi-Cai Li, Li-Ping Zhang, Ming-Gong Lee
      The interior field method (IFM) is applied to Neumann problems for Laplace's equation in elliptic domains. The polynomial convergence rates are derived, and small condition number as O(N) can be obtained, where N is the number of particular solutions used. Moreover, the effective condition number as O ( 1 ) is explored, to display excellent stability (Li et al., 2015 [21]). Numerical experiments are carried out, to support the analysis made. The error analysis of the IFM for Dirichlet problems in circular domains is reported in Li et al. (2016) [19]. The error and stability analysis of the IFM for Neumann problems in elliptic domains is more advanced and challenging; this is the first goal of this paper. The second goal is to compare the Neumann problems with the degenerate scales of Dirichlet problems; some useful guidances are found for application. From the comparisons, the conservation law is essential to guarantee the unique solutions. The adaptive processes are also proposed to deal with the algorithm singularity of Dirichlet problems; they may be applied to the boundary element method (BEM), the original NFM, and the indirect BIEM for the arbitrary smooth boundary or the convex polygonal boundary.

      PubDate: 2016-08-08T17:26:11Z
       
  • Simulation of micro-seismicity in response to injection/production in
           large-scale fracture networks using the fast multipole displacement
           discontinuity method (FMDDM)
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Moien Farmahini-Farahani, Ahmad Ghassemi
      Analysis of fluid flow, permeability, and micro-seismicity in large fracture networks are essential for economical production from engineered geothermal and petroleum reservoirs. In this work, the fluid pressure change, as a result of injection and production inside a stochastic, deformable, non-propagating fracture network is modeled using the fast multipole displacement discontinuity method combined with the finite difference method. The former is employed to simulate the response of the fracture network to changes in the pressure due to fluid injection. In addition to pressure changes inside the fracture network, changes in fracture status with respect to normal (“joint” versus hydraulic fracture) and shear (stick versus slip) deformation, dilation, and friction coefficient are considered. Rate-and-state friction model and the Mohr-Coulomb criterion are used to model slip and potential micro-earthquakes and their seismic moments. Simulation results show that increase in pressure inside a fracture network leads to permanent slip and nucleation of micro-earthquakes which are mostly influenced by the orientation of the fractures and the magnitude of fluid pressure and the injection rate. Injecting the same volume of water over a longer time period decreases the number and magnitude of seismic events.

      PubDate: 2016-08-08T17:26:11Z
       
  • Shape reconstructions from phaseless data
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Kuo-Ming Lee
      For the inverse scattering problem from a sound-soft obstacle with full far field data, a simple hybrid method was proposed by Lee [9]. In this research, we consider the case where as data only the modulus of the far field are available. The aim is to reconstruct the shape of the obstacle with this limited data.

      PubDate: 2016-08-08T17:26:11Z
       
  • MHD natural convection in a semi-annulus enclosure filled with water-based
           nanofluid using DRBEM
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): F.S. Oğlakkaya, Canan Bozkaya
      Natural convection of a water-based nanofluid consisting Cu nanoparticles in a semi-annulus enclosure subjected to a magnetic field is considered. The inner wall has constant heat flux, the outer wall is maintained at a cold temperature and the other two walls are thermally insulated. The governing equations derived by considering the effect of magnetic field are solved numerically using the dual reciprocity boundary method (DRBEM) with constant elements. The boundary only nature of the dual reciprocity method results in considerably small computational cost in obtaining the solution. The simulations focus on the effects of the Rayleigh number, the Hartmann number, the nanoparticle volume fraction, and the inclination angles of the enclosure and the magnetic field on the flow and heat transfer characteristics. The results show that the convection and the average Nusselt number ( Nu ¯ ) decrease with an increase in the strength of the magnetic field whereas they increase by increasing the Rayleigh number. Furthermore, an increase in Hartmann number accelerates the rate of decrease in Nu ¯ as inclination angles decrease. Thus, the inclined magnetic field and the inclination angle of the enclosure can be used as control parameters for enhancing the heat transfer convection and flow behavior in an enclosure.

      PubDate: 2016-08-04T17:14:00Z
       
  • Applications of the Clifford algebra valued boundary element method to
           electromagnetic scattering problems
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Jia-Wei Lee, Li-Wei Liu, Hong-Ki Hong, Jeng-Tzong Chen
      Electromagnetic problems governed by Maxwell's equations are solved by using a Clifford algebra valued boundary element method (BEM). The well-known Maxwell's equations consist of eight pieces of scalar partial differential equations of the first order. They can be rewritten in terms of the language of Clifford analysis as a nonhomogeneous k-Dirac equation with a Clifford algebra valued function. It includes three-component electric fields and three-component magnetic fields. Furthermore, we derive Clifford algebra valued boundary integral equations (BIEs) with Cauchy-type kernels and then develop a Clifford algebra valued BEM to solve electromagnetic scattering problems. To deal with the problem of the Cauchy principal value, we use a simple Clifford algebra valued k-monogenic function to exactly evaluate the Cauchy principal value. Free of calculating the solid angle for the boundary point is gained. The remaining boundary integral is easily calculated by using a numerical quadrature except the part of Cauchy principal value. This idea can also preserve the flexibility of numerical method, hence it is suitable for any geometry shape. In the numerical implementation, we introduce an oriented surface element instead of the unit outward normal vector and the ordinary surface element. In addition, we adopt the Dirac matrices to express the bases of Clifford algebra C l 3 ( ℂ ) . We also use an orthogonal matrix to transform global boundary densities into local boundary densities for satisfying boundary condition straightforward. Finally, two electromagnetic scattering problems with a perfect spherical conductor and a prolate spheroidal conductor are both considered to examine the validity of the Clifford algebra valued BEM with Cauchy-type kernels.

      PubDate: 2016-08-04T17:14:00Z
       
  • Numerical and experimental investigation on vibro-acoustic response of a
           shaft-hull system
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Chenyang Li, Jian Wang, Yegao Qu, Zhiyi Zhang, Hongxing Hua
      The vibro-acoustic characteristics of a submerged shaft-hull system are investigated by numerical and experimental methods. A numerical model for the structure-fluid interaction of the system is formulated by the coupled finite element/boundary element methods. With this model, the influence of the shaft vibration on the dynamic and acoustic responses of the submerged shaft-hull system is analyzed via the modal decomposition technology. It is found that reduction of the stiffness of the stern bearing and symmetrization of the foundation can reduce the sound radiation from the submerged shaft-hull system subjected to transversal and axial force excitations, respectively. The numerical solutions are validated by the experimental results, and reasonable agreement is observed.

      PubDate: 2016-08-04T17:14:00Z
       
  • A coupled FE-BIE model for the static analysis of Timoshenko beams bonded
           to an orthotropic elastic half-plane
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Enrico Tezzon, Nerio Tullini, Luca Lanzoni
      Interface displacements, surface tractions and stresses of a flexible beam bonded to an elastic orthotropic half-plane are analysed by means of a Finite Element-Boundary Integral Equation (FE-BIE) method. Numerical results are obtained by using locking-free shear deformable beams and piecewise constant interfacial reactions. Making use of the generalised Green's function for the half-plane, the mechanical behaviour of fully bonded or detached beams subjected to force, couple or thermal load is investigated. The special cases of a beam in bilateral frictionless contact with the half-plane and a beam having a vanishing bending rigidity (thin film) are considered also. In particular, the maximum bending moment of beams subjected to a vertical point force are compared with some closed-form solutions of the contact problem of a rigid indenter and with the solution of an infinite Euler–Bernoulli beam in bilateral frictionless contact with an isotropic substrate.

      PubDate: 2016-08-04T17:14:00Z
       
  • An ACA-SBM for some 2D steady-state heat conduction problems
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Xing Wei, Bin Chen, Shenshen Chen, Shuohui Yin
      In this paper, an accelerated singular boundary method (SBM) incorporating adaptive cross approximation (ACA) is developed for the steady-state heat conduction problems. The SBM, a recently developed boundary collocation method, employs the fundamental solutions of the governing operators as the kernel functions, and desingularizes the source singularity with a concept of origin intensity factor. However, the SBM suffers fully-populated influence matrix which results in prohibitively expensive operation counts and memory requirements as the number of degrees of freedom increases. In this paper, the ACA is applied to accelerate the SBM meanwhile reducing the memory requirement. Furthermore, the ACA-SBM is robust to different fundamental solutions, which enables it to deal with different heat conduction problems. The effectiveness, feasibility and robustness of the proposed method are numerically tested on different heat conduction problems including isotropic homogeneous, anisotropic homogeneous and non-homogeneous media with quadratic material variation of thermal conductivity, highlighting the accuracy as well as the significant reduction in memory storage and analysis time in comparison with the traditional SBM.

      PubDate: 2016-07-29T16:38:12Z
       
  • Coupling of BEM subdomains – BETI applied to collocation BEM with
           mixed basis functions
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Bernhard Lindner, Christian Duenser, Gernot Beer
      This work is about the coupling of subdomains for elasticity problems using the boundary element tearing and interconnecting method (BETI). BETI is a substructuring technique which is able to solve large problems involving subdomains efficiently, because its formulation is ideally suited for parallel computation. In contrast to the original formulation of BETI, where the symmetric Galerkin boundary element method (SGBEM) is applied, here the traditional collocation BEM is used. As will be shown the solution algorithm is applied in a very similar way as in the original version. Special attention will be paid to the distribution of tractions along interfaces of BEM subdomains. Especially if the coupling interface is not smooth but has corners and edges erroneous traction results can be obtained by using the non-symmetric approximation of the Dirichlet-to-Neumann map. For a sequential calculation involving several load steps this leads to unacceptable results if a classical continuous approximation of the physical fields is used. Therefore discontinuous basis functions for the displacement and traction field are introduced. As will be shown in this work the quality of results can be improved drastically by this technique.

      PubDate: 2016-07-29T16:38:12Z
       
  • Displacement and equilibrium mesh-free formulation based on integrated
           radial basis functions for dual yield design
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Phuc L.H. Ho, Canh V. Le, T. Tran-Cong
      This paper presents displacement and equilibrium mesh-free formulation based on integrated radial basis functions (iRBF) for upper and lower bound yield design problems. In these approaches, displacement and stress fields are approximated by the integrated radial basis functions, and the equilibrium equations and boundary conditions are imposed directly at the collocation points. In this paper it has been shown that direct nodal integration of the iRBF approximation can prevent volumetric locking in the kinematic formulation, and instability problems can also be avoided. Moreover, with the use of the collocation method in the static problem, equilibrium equations and yield conditions only need to be enforced at the nodes, leading to the reduction in computational cost. The mean value of the approximated upper and lower bound is found to be in excellent agreement with the available analytical solution, and can be considered as the actual collapse load multiplier for most practical engineering problems, for which exact solution is unknown.

      PubDate: 2016-07-29T16:38:12Z
       
  • Local Eshelby matrix in eigen-variable boundary integral equations for
           solids with particles and cracks in full space
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Yingjie Tang, Hang Ma, Cheng Yan
      In order for the large scale numerical simulation of solids with particles and cracks, the concept of local Eshelby matrix has been introduced into the computational model of the eigen-variable boundary integral equation (BIE) to resolve the problem of interactions among particles and cracks by joining the two concepts of the eigenstrain and eigen COD. The local Eshelby matrix in the present paper is considered as an extension of the concept of Eshelby tensor in numerical form for both equivalent inclusions and cracks, defined on the group of near field particles and cracks in full space. Through some typical numerical examples, the computations of stress intensity factors (SIF) are carried out and compared with the results of the sub-domain method using the dual BIE. With the proposed computational model, it is verified not only the correctness and feasibility but also the high efficiency of the present solution procedure, showing the potential of the proposed method for large scale numerical simulation of solids with particles and cracks.

      PubDate: 2016-07-29T16:38:12Z
       
  • Improved hybrid boundary solution for shell elements
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Taha H.A. Naga, Youssef F. Rashed
      In this paper, a new finite element for shell structures is developed using an improved hybrid boundary solution. First the variational boundary integral equation for shear-deformable plate bending problems is developed based on quadratic boundary elements. Hence such a formulation is coupled to a similar formulation for 2D plane stress problems to produce the developed shell elements. Numerical examples are presented to demonstrate the accuracy and validity of the proposed formulation.

      PubDate: 2016-07-29T16:38:12Z
       
  • Three-dimensional thermo-elastoplastic analysis of thick functionally
           graded plates using the meshless local Petrov–Galerkin method
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): R. Vaghefi, M.R. Hematiyan, A. Nayebi
      A numerical method based on the meshless local Petrov–Galerkin (MLPG) method is presented for three-dimensional (3D) thermo-elastoplastic analysis of thick functionally graded (FG) plates subjected to combined thermal and mechanical loads. The FG plate is assumed to be made of two constituents, whose volume fractions vary continuously in the thickness direction according to a power law. All material properties are considered to be temperature dependent. The von-Mises yield criterion and isotropic strain hardening rule are employed to describe the elastoplastic behaviors of the FG plates. The weak form is derived using the 3D equilibrium equations, and then it is transformed into local integral equations on brick-shaped local sub-domains by using a Heaviside step function as the test function. The proposed approach makes it possible to distribute more nodes in the direction of the material variation to construct the shape and test functions. Consequently, more accurate solutions can be obtained easily and effectively. Several numerical examples for temperature, displacement and stress analysis of thick FG plates are presented for different material gradients and boundary conditions. The obtained results have been compared with accurate finite element results and an excellent agreement has been observed.

      PubDate: 2016-07-25T16:22:05Z
       
  • Radial basis function-based pseudospectral method for static analysis of
           thin plates
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Artur Krowiak
      The paper deals with the implementation of radial basis function-based pseudospectral method (RBF-PS), which is a meshless numerical technique, to static analysis of thin, isotropic plates. The analyzed problem possesses multiple boundary conditions, therefore direct application of the RBF-PS is not straightforward. In the paper, some approaches to implement the method in such the case are presented. They are examined by the analysis of square plates as well as irregular shaped ones with various combinations of boundary conditions. A careful attention is paid to the problem of choosing an appropriate value of the shape parameter for radial basis functions and an effective approach is explained. The obtained results show the usefulness and high accuracy of the approaches proposed, confirming the advantages of the use of the radial basis function approximation in pseudospectral mode.

      PubDate: 2016-07-25T16:22:05Z
       
  • Implementation of CPCT based BIEs for 3D elasticity and its application in
           fracture mechanics
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Jia-He Lv, Xia-Ting Feng, Fei Yan, Bing-Rui Chen
      The accurate evaluation of singular boundary integrals is a long-debated issue for the successful implementation of BIEs. In the past decades, various methods have been developed, among which the singularity subtraction technique (SST) has been proved to be a unified method for various orders of singularities. However, the accuracy of original SST is sensitive to element shape due to the near singularity caused by element shape distortion. In this paper, a new conformal polar coordinate transformation (CPCT) for quadrilateral elements is proposed to eliminate the shape effect. Besides, an improved sigmoidal transformation is introduced in the angular direction to assign Gauss points more reasonably. By combination of the two strategies with original SST, a more efficient and robust numerical integration scheme for singular integrals can be obtained. Several numerical examples including crack problems are presented to demonstrate the accuracy and feasibility to coarse meshes for CPCT based BIEs and dual BEM.

      PubDate: 2016-07-18T15:46:47Z
       
  • Solid analysis of micron-sized thin structures with BEM for steady-state
           heat conduction
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Jia-He Lv, Xia-Ting Feng, Shao-Jun Li, Quan Jiang, Hao-Sen Guo
      Accurate thermal or mechanical analysis of thin structures has been a challenging task for various numerical methods, due to the exceeding closeness of the two neighboring surfaces. In this paper, the micron-sized interior-like thin structures for steady-state heat conduction is investigated with BEM. Three major difficulties would be encountered during solid analysis of thin structures with BEM: 1) degeneracy of the linear systems of equations; 2) evaluation of singular integrals over distorted elements; 3) evaluation of various orders of nearly singular integrals. To investigate the effect of singular and nearly singular integrals independently, the singularity subtraction technique (SST) and nonlinear distance transformation combined with adaptive subdivision method are employed to deal with singular and nearly singular integrals, respectively. Besides, a conformal mapping procedure aligned with sigmoidal transformation in angular direction is proposed to eliminate the near singularity derived from the distortion of element shape. Several challenging numerical examples with characteristic thickness h = 10 − 3 , including annular disk, hollow sphere and hollow torus examples, are solved with coarse meshes compared to original methods, and some meaningful conclusions have been obtained.

      PubDate: 2016-07-18T15:46:47Z
       
  • An improved exponential transformation for accurate evaluation of nearly
           singular boundary integrals in 3D BEM
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): Qing-Nian Yang, Yu Miao
      Accurate evaluation of nearly singular integrals is an important issue for the successful implementation of the boundary element method (BEM), and the exponential transformation has been proved to be feasible in dealing with nearly weak and strong singular integrals for 2D and 3D boundary elements with regular shape. In this paper, in order to eliminate the shape effect from distorted elements, an improved exponential transformation is proposed by combination of the conformal mapping and sigmoidal transformation in angular direction. Besides, the nearly hyper-singular integrals have been solved readily with a simple geometrical manipulation to convert them into line integrals. The performance of the conformal mapping based exponential transformation, including sensitivity to the relative distance, location of projection point and number of Gauss points used, is tested in detail through a distorted curved element extracted from cylinder surface. Finally, an alternative form of exponential transformation and comparisons with the distance transformation are discussed.

      PubDate: 2016-07-18T15:46:47Z
       
  • A boundary integral equation over the thin rotating blade of a wind
           turbine
    • Abstract: Publication date: October 2016
      Source:Engineering Analysis with Boundary Elements, Volume 71
      Author(s): K. Mescheryakov, M.A. Sumbatyan, A.A. Bondarchuk
      In the present paper we study the aerodynamics of a thin rotating Wind Turbine (WT) blade. Under the assumption of high specific speed (i.e. large angular velocity), by using the classical potential theory, the problem is reduced to a dual integral equation over the surface of the blade. Since a certain value of the axial component of the velocity vector, which is not known a priori, is present in the right-hand side of the basic dual integral equation, the method proposed is based on an iteration scheme. This rapidly converges in two-three steps. The method is tested on example of a small WT, by a comparison with the results obtained by the ANSYS-CFX finite-volume software.

      PubDate: 2016-07-18T15:46:47Z
       
  • A surface-to-surface scheme for 3D contact problems by boundary face
           method
    • Abstract: Publication date: September 2016
      Source:Engineering Analysis with Boundary Elements, Volume 70
      Author(s): Xiaomin Shu, Jianming Zhang, Lei Han, Yunqiao Dong
      The surface-to-surface contact algorithm has been proposed to overcome the drawbacks of node-to-surface algorithm in finite element method implementations. In the surface-to-surface algorithm, contact constraints are imposed between sub-elements rather than between nodes, and an auxiliary plane for each element is introduced to perform overlapping area detection. This work presents a combination of the surface-to-surface algorithm and the boundary face method (BFM) for solving contact problems in three dimensions. The BFM is based on boundary integral equation and is a truly isogeometric method, as it makes direct use of the geometric information of the bounding surface of a body. Apparently, the BFM is more suitable for solving contact problems. In our implementation, the auxiliary plane is no more necessary, but replaced by the boundary faces themselves which already exist in the BFM data structure. Our implementation is natural and can more precisely match the contact conditions between faces, and therefore, higher level of accuracy can be expected. Numerical examples presented have demonstrated the advantages of the combined method.

      PubDate: 2016-06-15T05:42:03Z
       
  • Free and forced vibration analyses using the four-node quadrilateral
           element with continuous nodal stress
    • Abstract: Publication date: September 2016
      Source:Engineering Analysis with Boundary Elements, Volume 70
      Author(s): Yongtao Yang, Li Chen, Dongdong Xu, Hong Zheng
      The recently published four-node quadrilateral element with continuous nodal stress (Quad4-CNS) is extended to free and forced vibration analyses of two-dimensional solids. The Quad4-CNS element can be regarded as a partition-of-unity (PU) based ‘FE-Meshfree’ element which inherits better accuracy, higher convergence rate, and high tolerance to mesh distortion from the meshfree methods, while preserving the Kronecker-delta property of the finite element method (FEM). Moreover, the Quad4-CNS element is free from the linear dependence problem which otherwise cripples many of the PU based finite elements. Several free and forced vibration problems are solved and the performance of the element is compared with that of the four-node isoparametric quadrilateral element (Quad4) and eight-node isoparametric quadrilateral element (Quad8). The results show that, for regular meshes, the performance of the element is superior to that of Quad4 element, and comparable to that of Quad8 element. For distorted meshes, the present element has better mesh-distortion tolerance than Quad4 and Quad8 elements.

      PubDate: 2016-06-15T05:42:03Z
       
  • A meshless solution of two dimensional multiphase flow in porous media
    • Abstract: Publication date: September 2016
      Source:Engineering Analysis with Boundary Elements, Volume 70
      Author(s): Karel Kovářík, Soňa Masarovičová, Juraj Mužík, Dana Sitányiová
      Multiphase fluid flow problems are of importance in many disciplines including hydrology and petroleum reservoir engineering. Standard methods such as the finite differences, finite volumes and expanded mixed finite elements methods use very general unstructured grids and need different grid adaptation strategies to ensure optimal solution of this non-linear problem. The meshless methods seem to be quite a good alternative to these classical mesh-based methods. In our work we used the meshless Petrov–Galerkin local method based on the pressure-saturation formulation.

      PubDate: 2016-06-15T05:42:03Z
       
 
 
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