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ENGINEERING (1196 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 216)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 177)
Composites Part B : Engineering     Hybrid Journal   (Followers: 224)
Composites Science and Technology     Hybrid Journal   (Followers: 163)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | Last

Journal Cover Comptes Rendus Mécanique
  [SJR: 0.633]   [H-I: 32]   [2 followers]  Follow
   Full-text available via subscription Subscription journal  (Not entitled to full-text)
   ISSN (Print) 1631-0721
   Published by Elsevier Homepage  [3051 journals]
  • Acoustical scattering identification with local impedance through a
           spectral approach
    • Abstract: Publication date: Available online 14 April 2017
      Source:Comptes Rendus Mécanique
      Author(s): Mohamed Amine Ben Souf, Ahmed Kessentini, Olivier Bareille, Mohamed Taktak, Mohamed N. Ichchou, Mohamed Haddar
      Acoustical scattering in waveguides is studied in this paper. The Wave Finite Element (WFE) approach is mainly used, since it allows the reduction of problems dealing with periodic waveguides. The paper deals with guided acoustical propagation, that is, propagation in a main direction is privileged. The scattering by a locally reacting lining is first studied. The liner can be characterised by its local impedance in this case. The equivalent surface impedance is therefore calculated. Then, scattering by a porous layer is considered. A full three-dimensional modelling of the lining is preferred since porous materials are bulk reacting. The scattering matrix of the lined part is computed, and acoustical scattering of high-order modes and conversion between modes are highlighted. The acoustic power attenuation is further evaluated. The response of ducts subjected to constraining boundary conditions is also calculated. Numerical results are presented and compared to those obtained with conventional approaches.

      PubDate: 2017-04-19T09:36:44Z
  • Identification of nonlinear anti-vibration isolator properties
    • Abstract: Publication date: Available online 2 April 2017
      Source:Comptes Rendus Mécanique
      Author(s): Fares Mezghani, Alfonso Fernández Del Rincón, Mohamed Amine Ben Souf, Pablo García Fernandez, Fakher Chaari, Fernando Viadero Rueda, Mohamed Haddar
      Vibrations are classified among the major problems for engineering structures. Anti-vibration isolators are used to absorb vibration energy and minimise transmitted force which can cause damage. The isolator is modelled as a parallel combination of stiffness and damping elements. The main purpose of the model is to enable designers to predict the dynamic response of systems under different structural excitations and boundary conditions. A nonlinear identification method, discussed in this paper, aims to provide a tool for engineers to extract information about the nonlinear dynamic behaviour using measured data from experiments. The proposed method is demonstrated and validated with numerical simulations. Thus, this technique is applied to determine the nonlinear parameters of a commercial metal mesh isolator. Nonlinear stiffness and nonlinear damping can decrease with the increase in the amplitude of the base excitation. The softening behaviour of the mesh isolator is clearly visible.

      PubDate: 2017-04-04T15:56:52Z
  • Dynamic and quasi-electromagnetostatic evolution of a
           thermoelectromagnetoelastic body
    • Abstract: Publication date: Available online 31 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Christian Licht, Somsak Orankitjaroen, Panumart Sawangtong, Thibaut Weller
      A standard technique of evolution equations in Hilbert spaces of possible states with finite energy supplies results of existence and uniqueness for the dynamic evolution of a thermoelectromagnetoelastic body and for its ‘‘quasi-electromagnetostatic approximation’’  whose relevance is established through a convergence result as a parameter, accounting for the ratio of the speed of elastic wave propagation to the celerity of the light, goes to zero.

      PubDate: 2017-04-04T15:56:52Z
  • Dynamic contact problem with adhesion and damage between
           thermo–electro–elasto-viscoplastic bodies
    • Abstract: Publication date: Available online 31 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Tedjani Hadj ammar, Abdelkader Saïdi, Abdelaziz Azeb Ahmed
      We study of a dynamic contact problem between two thermo–electro–elasto-viscoplastic bodies with damage and adhesion. The contact is frictionless and is modeled with normal compliance condition. We derive variational formulation for the model and prove an existence and uniqueness result of the weak solution. The proof is based on arguments of evolutionary variational inequalities, parabolic inequalities, differential equations, and fixed point theorem.

      PubDate: 2017-04-04T15:56:52Z
  • A high-order corrector estimate for a semi-linear elliptic system in
           perforated domains
    • Abstract: Publication date: Available online 22 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Vo Anh Khoa
      We derive in this Note a high-order corrector estimate for the homogenization of a microscopic semi-linear elliptic system posed in perforated domains. The major challenges are the presence of nonlinear volume and surface reaction rates. This type of correctors justifies mathematically the convergence rate of formal asymptotic expansions for the two-scale homogenization settings. As the main tool, we use energy-like estimates to investigate the error estimate between the micro and macro concentrations and between the corresponding micro- and macro-concentration gradients. This work aims at generalizing the results reported in [1,2].

      PubDate: 2017-03-28T14:36:44Z
  • On Hashin–Shtrikman-type bounds for nonlinear conductors
    • Abstract: Publication date: Available online 18 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Michaël Peigney
      For linear composite conductors, it is known that the celebrated Hashin–Shtrikman bounds can be recovered by the translation method. We investigate whether the same conclusion extends to nonlinear composites in two dimensions. To that purpose, we consider two-phase composites with perfectly conducting inclusions. In that case, explicit expressions of the various bounds considered can be obtained. The bounds provided by the translation method are compared with the nonlinear Hashin–Shtrikman-type bounds delivered by the Talbot–Willis (1985) [2] and the Ponte Castañeda (1991) [3] procedures.

      PubDate: 2017-03-21T13:04:50Z
  • Modeling of failure characteristics of rectangular hard rock influenced by
           sample height-to-width ratios: A finite/discrete element approach
    • Abstract: Publication date: Available online 18 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Fan Feng, Xibing Li, Diyuan Li
      In the present study, a combined finite/element approach is used to analyze failure characteristics of a rectangular hard rock with different sample height-to-width ratios based on the uniaxial compression test. The objective of this paper is to illustrate the transitional mechanisms from shear fracture to extension failure of brittle rocks and the occurrence conditions of surface-parallel slabbing. Numerical results show that failure modes have experienced the shear, tension with shear and surface-parallel slabbing failure with the decrease of sample height-to-width ratios. It is seen from the simulation results that the shear band in larger height-to-width ratios is composed of an amount of extension meso-cracks that are parallel to the loading direction, and the slabbing failure tends to be the result of the accessible propagation of extension meso-cracks due to short sample height, which validate the essence of extension failure in hard rocks. The good agreement between simulation and laboratory testing also shows the practicability and advancement of a combined finite/discrete element approach.

      PubDate: 2017-03-21T13:04:50Z
  • Fatigue crack growth simulation in coated materials using X-FEM
    • Abstract: Publication date: Available online 17 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Khalid Nasri, Mohammed Zenasni
      In the present work, the eXtended Finite Element Method (XFEM) is used to study the effect of bi-material interfaces on fatigue life in galvanised panels. X-FEM and Paris law are implemented in ABAQUS software using Python code. The XFEM method proved to be an adequate method for stress intensity factor computation, and, furthermore, no remeshing is required for crack growth simulations. A study of fatigue crack growth is conducted for several substrate materials, and the influence of the initial crack angle is ascertained. This study also compares the crack growth rate between three types of bi-materials alloys zinc/steel, zinc/aluminium, and zinc/zinc. The interaction between two cracks and fatigue life, in the presence of bi-material interface, is investigated as well.

      PubDate: 2017-03-17T10:59:23Z
  • 2-D hydro-viscoelastic model for convective drying of deformable and
           unsaturated porous material
    • Abstract: Publication date: Available online 15 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Lamine Hassini, Lamloumi Raja, Gisèle Laure Lecompte-Nana, Mohamed Afif Elcafsi
      The aim of this work was to simulate in two dimensions the spatio-temporal evolution of the moisture content, the temperature, the solid (dry matter) concentration, the dry product total porosity, the gas porosity, and the mechanical stress within a deformable and unsaturated product during convective drying. The material under study was an elongated cellulose–clay composite sample with a square section placed in hot air flow. Currently, this innovative composite is used in the processing of boxes devoted to the preservation of heritage and precious objects against fire damage and other degradation (moisture, insects, etc.). A comprehensive and rigorous hydrothermal model had been merged with a dynamic linear viscoelasticity model based on Bishop's effective stress theory, assuming that the stress tensor is the sum of solid, liquid, and gas stresses. The material viscoelastic properties were measured by means of stress relaxation tests for different water contents. The viscoelastic behaviour was described by a generalized Maxwell model whose parameters were correlated to the water content. The equations of our model were solved by means of the ‘COMSOL Multiphysics’ software. The hydrothermal part of the model was validated by comparison with experimental drying curves obtained in a laboratory hot-air dryer. The simulations of the spatio-temporal distributions of mechanical stress were performed and interpreted in terms of material potential damage. The sample shape was also predicted all over the drying process.

      PubDate: 2017-03-17T10:59:23Z
  • A method for the identification of dynamic constraint parameters in
           multi-supported flexible structures
    • Abstract: Publication date: Available online 14 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Ahmad Baklouti, José Antunes, Vincent Debut, Tahar Fakhkakh, Mohamed Haddar
      In this paper, a new method for identifying the dynamical parameters of local constraining supports such as mass, stiffness, and damping was developed through combining the measured frequency transfer functions and structural modification techniques. Since measurement noise often leads to erroneous identifications, regularization techniques have been implemented to reduce noise amplification in the inverse problem. The developed technique has been validated by numerical tests on a multi-supported flexible structure, which can be seen as an idealized electricity generator rotor shaft. The results are satisfactory for noise-free data as well as under realistic noise levels. The sensitivity of the identified support features to noise levels is asserted through a parametric study

      PubDate: 2017-03-17T10:59:23Z
  • Bridging meso- and microscopic anisotropic unilateral damage formulations
           for microcracked solids
    • Abstract: Publication date: Available online 9 March 2017
      Source:Comptes Rendus Mécanique
      Author(s): Qi-Zhi Zhu, Shuang-Shuang Yuan, Jian-fu Shao
      A mathematically consistent and unified description of induced anisotropy and unilateral effects constitutes one of the central tasks in the continuum damage theories developed so far. This paper aims at bridging constitutive damage formulations on meso- and micro-scales with an emphasis on a complete mesoscopic determination of material effective properties for microcracked solids. The key is to introduce a new set of invariants in terms of strain tensor and fabric tensor by making use of the Walpole's tensorial base. This invariant set proves to be equivalent to the classical one, while the new one provides great conveniences to high-order orientation-dependent tensor manipulations. When limited to the case of parallel microcracks, potential relations between ten combination coefficients are established by applying continuity conditions. It is found that the dilute approximation with penny-shaped microcracks is a particular case of the present one. By originally introducing effective strain effect, interactions between microcracks are taken into account with comparison to the Mori–Tanaka method as well as the Ponte-Castaneda and Willis scheme. For completeness, discussions are also addressed on macroscopic formulations with high-order damage variables.

      PubDate: 2017-03-10T09:51:41Z
  • Two-phase flow patterns and size distribution of droplets in a
           microfluidic T-junction: Experimental observations in the squeezing regime
    • Abstract: Publication date: Available online 21 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Yassine Mahdi, Kamel Daoud, Lounès Tadrist
      Generating micrometer sized droplets has been studied in a microfluidic system with T-junction geometry 250 μm in internal diameter and with PTFE capillary tubing. Several experiments were conducted by varying the flow rate of the dispersed phase from 2.78 ⋅ 10 − 11  m 3 / s to 5.28 ⋅ 10 − 9  m 3 / s and that of the continuous phase from 2.78 ⋅ 10 − 10  m 3 / s to 1.94 ⋅ 10 − 9  m 3 / s . The visualization of different flow regimes (drop, plug, and annular) was carried out for three configurations (not inverted in a horizontal position, inverted in a horizontal position, and inverted in a vertical position) for low capillary numbers. The model of Gauss was also chosen for a droplet size distribution in the dispersed phase, with the flow quality x varying from 0.016 to 0.44. The evolution of the drop size distribution as a function of the flow quality in the dispersed phase shows that the variation coefficient of the droplet's diameter is inversely proportional to the flow quality.

      PubDate: 2017-03-10T09:51:41Z
  • Reply to “Comments on ‘Large deflection and rotation of Timoshenko
           beams with frictional end supports under three-point bending’ ” [C.
           R. Mecanique 345 (2017), doi:10.1016/j.crme.2017.01.004]
    • Abstract: Publication date: Available online 9 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Dao-Kui Li, Xian-Fang Li

      PubDate: 2017-02-11T01:41:58Z
  • Comments on ‘Large deflection and rotation of Timoshenko beams with
           frictional end supports under three-point bending’ [Comptes rendus
           Mecanique 344 (8) (2016) 556–568]
    • Abstract: Publication date: Available online 9 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Milan Batista
      The paper discusses certain limitations of the analytical solution presented in this article [1]. It is demonstrated that the solution is valid only for small deflections of an inextensible beam.

      PubDate: 2017-02-11T01:41:58Z
  • Analyse thermomécanique des problèmes de fissure fixe sous
           chargement dynamique
    • Abstract: Publication date: Available online 8 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Zoumana Soumahoro, Hubert Maigre
      The purpose of this work is the study of thermomechanical coupling in the mechanisms of dynamic rupture in a fixed crack under dynamic loading.

      PubDate: 2017-02-11T01:41:58Z
  • Heterogeneous linearly piezoelectric patches bonded on a linearly elastic
    • Abstract: Publication date: Available online 8 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Christian Licht, Somsak Orankitjaroen, Patcharakorn Rojchanasuwakul, Thibaut Weller
      In [1], we studied the response of a thin homogeneous piezoelectric patch perfectly bonded to an elastic body. Here we extend this study to the case of a very thin heterogeneous patch made of a periodic distribution of piezoelectric inclusions embedded in a linearly elastic matrix and perfectly bonded to an elastic body. Through a rigorous mathematical analysis, we show that various asymptotic models arise, depending on the electromechanical loading together with the relative behavior between the thickness of the patch and the size of the piezoelectric inclusions.

      PubDate: 2017-02-11T01:41:58Z
  • Vibro-acoustic modeling and validation using viscoelastic material
    • Abstract: Publication date: Available online 6 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Rogério Pirk, Stijn Jonckheere, Bert Pluymers, Wim Desmet
      In aerospace industries, on-board electronics are carried during flight, and such equipment must be qualified to withstand the loads to which they are exposed. In this fashion, the knowledge of the different dynamic aspects of excitations and the behavior of structures, components and/or acoustic enclosures are crucial to have controlled and performing space systems. Passive control techniques using viscoelastic materials (VEM) are widely applied and their effects on space systems must be studied aiming to obtain adequate operational environments. The effect of damping insertion on the dynamic behavior of a vibro-acoustic system is assessed in this work. A coupled structural–acoustic system, composed by a VEM coated aluminum panel and an acoustic box, is modeled by Finite Element Method (FEM). On the other side, tests are preformed using the KU Leuven facilities to validate the FEM model. Numerical vs. experimental comparisons were done and acceptable agreement was obtained. On the other side, it was found that sound inside the box reduces due to the smaller sound radiation generated by the treated panel.

      PubDate: 2017-02-11T01:41:58Z
  • Nonlocal modeling of a randomly distributed and aligned long-fiber
           composite material
    • Abstract: Publication date: Available online 6 February 2017
      Source:Comptes Rendus Mécanique
      Author(s): Azdine Nait-ali
      The work under study is about the variational and stochastic modeling of randomly distributed and aligned long-fiber composites. Its objective is to derive a homogenized behavior that exhibits the nonlocal phenomenon of this type of material at the macroscopic scale. Several methods of applied mathematics are used in order to keep the maximum information about the nonlocal behavior after homogenization.

      PubDate: 2017-02-11T01:41:58Z
  • Prediction of the critical buckling load of multi-walled carbon nanotubes
           under axial compression
    • Abstract: Publication date: Available online 6 January 2017
      Source:Comptes Rendus Mécanique
      Author(s): Abdelaziz Timesli, Bouazza Braikat, Mohammad Jamal, Noureddine Damil
      In this paper, we propose a new explicit analytical formula of the critical buckling load of double-walled carbon nanotubes (DWCNT) under axial compression. This formula takes into account van der Waals interactions between adjacent tubes and the effect of terms involving tube radii differences generally neglected in the derived expressions of the critical buckling load published in the literature. The elastic multiple Donnell shells continuum approach is employed for modelling the multi-walled carbon nanotubes. The validation of the proposed formula is made by comparison with a numerical solution. The influence of the neglected terms is also studied.

      PubDate: 2017-01-06T15:45:00Z
  • On the connection between tug-of-war games and nonlocal PDEs on graphs
    • Abstract: Publication date: Available online 20 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Abderrahim Elmoataz, Pierre Buyssens
      In this paper, we are interested in the connection between some stochastic games, namely the tug-of-war games, and non-local PDEs on graphs. We consider a general formulation of tug-of-war games related to many continuous PDEs. Using the framework of partial difference equations, we transcribe this formulation on graph, and show that it encompasses several PDEs on graphs such as the ∞-Laplacian, the game p-Laplacian with and without gradient terms, and the eikonal equation. We then interpret these discrete games as non-local tug-of-war games. The proposed framework is illustrated with general interpolation problems on graphs.

      PubDate: 2016-12-21T11:31:42Z
  • Simulation-based conceptual design of an acoustic metamaterial with full
           band gap using an air-based 1-3 piezoelectric composite for ultrasonic
           noise control
    • Abstract: Publication date: Available online 15 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Shahrokh Rezaei, Morteza Eskandari-Ghadi, Mohammad Rahimian
      This paper aims at proposing a novel type of acoustic metamaterials with complete band gap composed of piezoelectric rods with square array as inclusions embedded in an air background (matrix). A modified plane wave expansion method accompanied with the principles of the Bloch–Floquet method with electromechanical coupling effect and also impedance spectra are used to get a band frequency and to investigate the passband for the selected cut of piezoelectric rods. We investigate both the electromechanical coupling coefficient and mechanical quality factor and their dependency to passband and bandwidth, which depends on both the density and the wave impedance of the matrix and the inclusions (rods). The ratio of the volume of inclusion to the matrix is used to define the fill factor or the so-called inclusion ratio, to introduce the bandwidth as a function of that. Furthermore, the fabrication method is presented in this paper. The results make a suitable foundation for design purposes and may develop an inherently passive ultrasonic noise control. In addition, the results provide the required guidance for a simulation-based design of elastic wave filters or wave guide that might be useful in high-precision mechanical systems operated in certain frequency ranges and switches made of piezoelectric materials; they also propose a novel type of elastic metamaterials, which is independent of the wave direction and has an equal sensitivity in all directions in which it reacts omnidirectionally and mitigates the occupational noise exposure.

      PubDate: 2016-12-21T11:31:42Z
  • Eigensolutions to a vibroacoustic interior coupled problem with a
           perturbation method
    • Abstract: Publication date: Available online 15 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Bertille Claude, Laetitia Duigou, Gregory Girault, Jean-Marc Cadou
      In this paper, an efficient and robust numerical method is proposed to solve non-symmetric eigenvalue problems resulting from the spatial discretization with the finite element method of a vibroacoustic interior problem. The proposed method relies on a perturbation method. Finding the eigenvalues consists in determining zero values of a scalar that depends on angular frequency. Numerical tests show that the proposed method is not sensitive to poorly conditioned matrices resulting from the displacement–pressure formulation. Moreover, the computational times required with this method are lower than those needed with a classical technique such as, for example, the Arnoldi method.

      PubDate: 2016-12-21T11:31:42Z
  • Invariant solutions in a channel flow using a minimal restricted nonlinear
    • Abstract: Publication date: Available online 12 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Frédéric Alizard
      Simulations using a Restricted Nonlinear (RNL) system, where mean flow distortion resulting from Reynolds stress feedback regenerates rolls, is applied in a channel flow under subcritical conditions. This quasi-linear restriction of the dynamics is used to study invariant solutions located in the bulk of the flow found recently by Rawat et al. (2016) [14]. It is shown that the RNL system truncated to a single streamwise mode for the perturbation supports invariant solutions that are found to bifurcate from a relative periodic orbit into a travelling wave solution when the spanwise size is increasing. In particular, the travelling wave solution exhibits a spanwise localized structure that remains unchanged for large values of the spanwise extent as the invariant solution lying on the lower branch found by Rawat et al. (2016) [14]. In addition, travelling wave solutions provided by this minimal RNL system are self-similar with respect to the Reynolds number based on the centreline velocity, and the half-channel height varying from 2000 to 5000.

      PubDate: 2016-12-14T09:49:36Z
  • Note on the stability of viscous roll waves
    • Abstract: Publication date: Available online 3 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Blake Barker, Mathew A. Johnson, Pascal Noble, Luis Miguel Rodrigues, Kevin Zumbrun
      In this note, we announce a complete classification of the stability of periodic roll-wave solutions of the viscous shallow water equations, from their onset at Froude number F ≈ 2 up to the infinite Froude limit. For intermediate Froude numbers, we obtain numerically a particularly simple power-law relation between F and the boundaries of the region of stable periods, which appears potentially useful in hydraulic engineering applications. In the asymptotic regime F → 2 (onset), we provide an analytic expression of the stability boundaries, whereas in the limit F → ∞ , we show that roll waves are always unstable.

      PubDate: 2016-12-07T08:00:44Z
  • A tribute to Bernard Zappoli
    • Abstract: Publication date: Available online 1 December 2016
      Source:Comptes Rendus Mécanique
      Author(s): Jean-Jacques Favier

      PubDate: 2016-12-07T08:00:44Z
  • Blood flow and microgravity
    • Abstract: Publication date: Available online 25 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Lionel Bureau, Gwennou Coupier, Frank Dubois, Alain Duperray, Alexander Farutin, Christophe Minetti, Chaouqi Misbah, Thomas Podgorski, Daria Tsvirkun, Mikhail Vysokikh
      The absence of gravity during space flight can alter cardio-vascular functions partially due to reduced physical activity. This affects the overall hemodynamics, and in particular the level of shear stresses to which blood vessels are submitted. Long-term exposure to space environment is thus susceptible to induce vascular remodeling through a mechanotransduction cascade that couples vessel shape and function with the mechanical cues exerted by the circulating cells on the vessel walls. Central to such processes, the glycocalyx – i.e. the micron-thick layer of biomacromolecules that lines the lumen of blood vessels and is directly exposed to blood flow – is a major actor in the regulation of biochemical and mechanical interactions. We discuss in this article several experiments performed under microgravity, such as the determination of lift force and collective motion in blood flow, and some preliminary results obtained in artificial microfluidic circuits functionalized with endothelium that offer interesting perspectives for the study of the interactions between blood and endothelium in healthy condition as well as by mimicking the degradation of glycocalyx caused by long space missions. A direct comparison between experiments and simulations is discussed.

      PubDate: 2016-11-30T05:09:56Z
  • Thermal convection in a cylindrical annulus under a combined effect of the
           radial and vertical gravity
    • Abstract: Publication date: Available online 24 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Antoine Meyer, Marcel Jongmanns, Martin Meier, Christoph Egbers, Innocent Mutabazi
      The stability of the flow of a dielectric fluid confined in a cylindrical annulus submitted to a radial temperature gradient and a radial electric field is investigated theoretically and experimentally. The radial temperature gradient induces a vertical Archimedean buoyancy and a radial dielectrophoretic buoyancy. These two forces intervene simultaneously in the destabilization of the flow, leading to the occurrence of four types of modes depending on the relative intensity of these two buoyancies and on the fluid's properties: hydrodynamic and thermal modes that are axisymmetric and oscillatory, stationary columnar modes and electric modes which are stationary and non-axisymmetric modes. Experiments performed in a parabolic flight show the existence of non-axisymmetric modes that should be either columnar or helicoidal vortices.

      PubDate: 2016-11-30T05:09:56Z
  • Foreword
    • Abstract: Publication date: Available online 23 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Jacqueline Etay, Roger Prud'homme, Pierre Haldenwang

      PubDate: 2016-11-30T05:09:56Z
  • Flows induced by power-law stretching surface motion modulated by
           transverse or orthogonal surface shear
    • Abstract: Publication date: Available online 16 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Patrick Weidman
      Boundary-layer solutions to Banks' problem for the flow induced by power-law stretching of a plate are obtained for two generalizations that include arbitrary transverse plate shearing motion. In one extension an arbitrary transverse shearing motion is the product of the power-law stretching. In the other extension the streamwise stretching coordinate is added to an arbitrary transverse shearing and together raised to the power of stretching. In addition we find that Banks' power law stretching may be accompanied by orthogonal power-law shear. In all cases, the original boundary-value problem of Banks [1] is recovered. Results are illustrated with velocity profiles both at the plate and at fixed height in the fluid above the plate.

      PubDate: 2016-11-30T05:09:56Z
  • Microgravity experiments and numerical studies on ethanol/air spray flames
    • Abstract: Publication date: Available online 16 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Romain Thimothée, Christian Chauveau, Fabien Halter, Colette Nicoli, Pierre Haldenwang, Bruno Denet
      Spray flames are known to exhibit amazing features in comparison with single-phase flames. The weightless situation offers the conditions in which the spray characteristics can be well controlled before and during combustion. The article reports on a joint experimental/numerical work that concerns ethanol/air spray flames observed in a spherical chamber using the condensation technique of expansion cooling (based on the Wilson cloud chamber principle), under microgravity. We describe the experimental set-up and give details on the creation of a homogeneous and nearly monosized aerosol. Different optical diagnostics are employed successfully to measure the relevant parameters of two-phase combustion. A classical shadowgraphy system is used to track the flame speed propagation and allow us to observe the flame front instability. The complete characterization of the aerosol is performed with a laser diffraction particle size analyser by measuring the droplet diameter and the droplet density number, just before ignition. A laser tomography device allows us to measure the temporal evolution of the droplet displacement during flame propagation, as well as to identify the presence of droplets in the burnt gases. The numerical modelling is briefly recalled. In particular, spray-flame propagation is schematized by the combustion spread in a 2-D lattice of fuel droplets surrounded by an initial gaseous mixture of fuel vapour and air. In its spherical expansion, the spray flame presents a corrugated front pattern, while the equivalent single-phase flame does not. From a numerical point of view, the same phenomena of wrinkles are also observed in the simulations. The front pattern pointed out by the numerical approach is identified as of Darrieus–Landau (DL) type. The droplets are found to trigger the instability. Then, we quantitatively compare experimental data with numerical predictions on spray-flame speed. The experimental results show that the spray-flame speed is of the same order of magnitude as that of the single-phase premixed flame. On the other hand, the numerical results exhibit the role played by the droplet radius in spray-flame propagation, and retrieve the experiments only when the droplets are small enough and when the Darrieus–Landau instability is triggered. A final discussion is developed to interpret the various patterns experimentally observed for the spray-flame front.

      PubDate: 2016-11-30T05:09:56Z
  • Mathematical justification of an elastic elliptic membrane obstacle
    • Abstract: Publication date: Available online 15 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Ángel Rodríguez-Arós
      Starting from the 3D Signorini problem for a family of elastic elliptic shells, we justify that the obstacle problem of an elastic elliptic membrane is the right approximation posed in a 2D domain, when the thickness tends to zero. Specifically, we provide convergence results in the scaled and de-scaled formulations.

      PubDate: 2016-11-30T05:09:56Z
  • On the interest of microgravity experimentation for studying convective
           effects during the directional solidification of metal alloys
    • Abstract: Publication date: Available online 15 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Henri Nguyen-Thi, Guillaume Reinhart, Bernard Billia
      Under terrestrial conditions, solidification processes are often affected by gravity effects, which can significantly influence the final characteristics of the grown solid. The low-gravity environment of space offers a unique and efficient way to eliminate these effects, providing valuable benchmark data for the validation of models and numerical simulations. Moreover, a comparative study of solidification experiments on earth and in low-gravity conditions can significantly enlighten gravity effects. The aim of this paper is to give a survey of solidification experiments conducted in low-gravity environment on metal alloys, with advanced post-mortem analysis and eventually by in situ and real-time characterization.

      PubDate: 2016-11-30T05:09:56Z
  • Combustion in microgravity: The French contribution
    • Abstract: Publication date: Available online 14 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Roger Prud'homme, Guillaume Legros, José L. Torero
      Microgravity (drop towers, parabolic flights, sounding rockets and space stations) are particularly relevant to combustion problems given that they show high-density gradients and in many cases weak forced convection. For some configurations where buoyancy forces result in complex flow fields, microgravity leads to ideal conditions that correspond closely to canonical problems, e.g., combustion of a spherical droplet in a far-field still atmosphere, Emmons' problem for flame spreading over a solid flat plate, deflagration waves, etc. A comprehensive chronological review on the many combustion studies in microgravity was written first by Law and Faeth (1994) and then by F.A. Williams (1995). Later on, new recommendations for research directions have been delivered. In France, research has been managed and supported by CNES and CNRS since the creation of the microgravity research group in 1992. At this time, microgravity research and future activities contemplated the following: – Droplets: the “ D 2 law” has been well verified and high-pressure behavior of droplet combustion has been assessed. The studies must be extended in two main directions: vaporization in mixtures near the critical line and collective effects in dense sprays. – Flame spread: experiments observed blue flames governed by diffusion that are in accordance with Emmons' theory. Convection-dominated flames showed significant departures from the theory. Some theoretical assumptions appeared controversial and it was noted that radiation effects must be considered, especially when regarding the role of soot production in quenching. – Heterogeneous flames: two studies are in progress, one in Poitiers and the other in Marseilles, about flame/suspension interactions. – Premixed and triple flames: the knowledge still needs to be complemented. Triple flames must continue to be studied and understanding of “flame balls” still needs to be addressed.

      PubDate: 2016-11-30T05:09:56Z
  • Aqueous foams and foam films stabilised by surfactants. Gravity-free
    • Abstract: Publication date: Available online 9 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Dominique Langevin
      There are still many open questions and problems in both fundamental research and practical applications of foams. Despite the fact that foams have been extensively studied, many aspects of foam physics and chemistry still remain unclear. Experiments on foams performed under microgravity allow studying wet foams, such as those obtained early during the foaming process. On Earth, wet foams evolve too quickly due to gravity drainage and only dry foams can be studied. This paper reviews the foam and foam film studies that we have performed in gravity-free conditions. It highlights the importance of surface rheology as well as of confinement effects in foams and foam films behaviour.

      PubDate: 2016-11-30T05:09:56Z
  • Nucleate pool boiling in microgravity: Recent progress and future
    • Abstract: Publication date: Available online 9 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Catherine Colin, Olivier Kannengieser, Wladimir Bergez, Michel Lebon, Julien Sebilleau, Michaël Sagan, Sébastien Tanguy
      Pool boiling on flat plates in microgravity has been studied for more than 50 years. The results of recent experiments performed in sounding rocket are presented and compared to previous results. At low heat flux, the vertical oscillatory motion of the primary bubble is responsible for the increase in the heat transfer coefficient in microgravity compared to ground experiments. The effect of a non-condensable gas on the stabilisation of the large primary bubble on the heater is pointed out. Experiments on isolated bubbles are also performed on ground and in parabolic flight. The effect of a shear flow on the bubble detachment is highlighted. A force balance model allows determining an expression of the capillary force and of the drag force acting on the bubble.

      PubDate: 2016-11-30T05:09:56Z
  • Eutectic solidification patterns: Interest of microgravity environment
    • Abstract: Publication date: Available online 8 November 2016
      Source:Comptes Rendus Mécanique
      Author(s): Mathis Plapp, Sabine Bottin-Rousseau, Gabriel Faivre, Silvère Akamatsu
      The solidification of binary eutectic alloys produces two-phase composite materials in which the microstructure, that is, the geometrical distribution of the two solid phases, results from complex pattern-formation processes at the moving solid–liquid interface. Since the volume fraction of the two solids depends on the local composition, solidification dynamics can be strongly influenced by thermosolutal convection in the liquid. In this contribution, we review our experimental and numerical work devoted to the understanding of eutectic solidification under purely diffusive conditions, which will soon be tested and extended during the microgravity experiment TRANSPARENT ALLOYS planned by the European Space Agency (ESA).

      PubDate: 2016-11-30T05:09:56Z
  • Homogenization of random attractors for reaction–diffusion systems
    • Abstract: Publication date: November–December 2016
      Source:Comptes Rendus Mécanique, Volume 344, Issues 11–12
      Author(s): Kuanysh A. Bekmaganbetov, Gregory A. Chechkin, Vladimir V. Chepyzhov
      We consider reaction–diffusion systems with randomly oscillating terms. We construct the deterministic homogenized reaction–diffusion system and prove that the trajectory attractors of the initial systems converge to the trajectory attractors of the homogenized systems.

      PubDate: 2016-11-30T05:09:56Z
  • The Proper Generalized Decomposition as a space–time integrator for
           elastoplastic problems
    • Abstract: Publication date: November–December 2016
      Source:Comptes Rendus Mécanique, Volume 344, Issues 11–12
      Author(s): Jean-Michel Bergheau, Sylvain Zuchiatti, Jean-Christophe Roux, Éric Feulvarch, Samuel Tissot, Gilles Perrin
      This paper details the development of the Proper Generalized Decomposition as a space–time integrator of elastoplastic problems and shows its ability to determine the elastoplastic states resulting from cyclic loadings. The first part of this paper recalls the step-by-step resolution in time of an elastoplastic problem. The implementation of the Proper Generalized Decomposition is then developed in a second part. In the last third part, applications and numerical simulations are presented to show the relevance of the method.

      PubDate: 2016-11-30T05:09:56Z
  • Variational discretizations for the dynamics of fluid-conveying flexible
    • Abstract: Publication date: November–December 2016
      Source:Comptes Rendus Mécanique, Volume 344, Issues 11–12
      Author(s): François Gay-Balmaz, Vakhtang Putkaradze
      We derive a variational approach for discretizing fluid–structure interactions, with a particular focus on the dynamics of fluid-conveying elastic tubes. Our method is based on a discretization of the fluid's back-to-labels map and a Lie group discretization of the tube's variables, coupled with an appropriately formulated discrete version of the fluid conservation law. This approach allows the development of geometric numerical schemes for the dynamics of fluid-conveying collapsible tubes, which preserve several intrinsic geometric properties of the continuous system, such as symmetries and symplecticity. In addition, our approach can also be used to derive simplified, but geometrically consistent, low-component models for further analytical and numerical analysis of the system.

      PubDate: 2016-11-30T05:09:56Z
  • Evaporation condensation-induced bubble motion after temperature gradient
    • Abstract: Publication date: Available online 31 October 2016
      Source:Comptes Rendus Mécanique
      Author(s): Vadim S. Nikolayev, Yves Garrabos, Carole Lecoutre, Guillaume Pichavant, Denis Chatain, Daniel Beysens
      Thermocapillary (Marangoni) motion of a gas bubble (or a liquid drop) under a temperature gradient can hardly be present in a one-component fluid. Indeed, in such a pure system, the vapor–liquid interface is always isothermal (at saturation temperature). However, evaporation on the hot side and condensation on the cold side can occur and displace the bubble. We have observed such a phenomenon in two different fluids submitted to a temperature gradient under reduced gravity: hydrogen under magnetic compensation of gravity in the HYLDE facility at CEA-Grenoble and water in the DECLIC facility onboard the ISS. The experiments and the subsequent analysis are performed in the vicinity of the vapor–liquid critical point to benefit from critical universality. In order to better understand the phenomena, a 1D numerical simulation has been performed. After the temperature gradient is imposed, two regimes can be evidenced. At early times, the temperatures in the bubble and the surrounding liquid become different thanks to their different compressibility and the “piston effect” mechanism, i.e. the fast adiabatic bulk thermalization induced by the expansion of the thermal boundary layers. The difference in local temperature gradients at the vapor–liquid interface results in an unbalanced evaporation/condensation phenomenon that makes the shape of the bubble vary and provoke its motion. At long times, a steady temperature gradient progressively forms in the liquid (but not in the bubble) and induces steady bubble motion towards the hot end. We evaluate the bubble velocity and compare with existing theories.

      PubDate: 2016-11-30T05:09:56Z
  • Bernard Zappoli's contribution to the French scientific life
    • Abstract: Publication date: Available online 28 October 2016
      Source:Comptes Rendus Mécanique
      Author(s): Roger Prud'homme
      In November 2014, at the annual meeting of the research group “Fundamental and Applied Microgravity” held in Carqueiranne, France, I was asked to speak on Bernard Zappoli and his accomplishments. The following is an edited transcription of the speech delivered in his honor following his recent retirement as the Head of The Physical Science Programme at the French Space Agency (CNES). After an introduction outlining his human qualities and retirement as engineer emeritus, his career is summarized. It then details the scientific activities he has undertaken during different periods of his career at several universities, the European Society of Propulsion (“Société européenne de propulsion”, SEP), and the CNES. Special attention is devoted to the research groups at the CNES/CNRS that we initiated and the management of which I had been sharing with him for several years. Allusion is made to his recent and new retiree activities.

      PubDate: 2016-11-30T05:09:56Z
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