Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
    - GEOMETRY AND TOPOLOGY (23 journals)
    - MATHEMATICS (714 journals)
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APPLIED MATHEMATICS (92 journals)

Showing 1 - 82 of 82 Journals sorted alphabetically
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 12)
Advances in Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 7)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 15)
AKCE International Journal of Graphs and Combinatorics     Open Access  
American Journal of Applied Mathematics and Statistics     Open Access   (Followers: 10)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Modeling and Optimization     Open Access   (Followers: 2)
Annals of Actuarial Science     Full-text available via subscription   (Followers: 2)
Applied Mathematical Modelling     Full-text available via subscription   (Followers: 23)
Applied Mathematics and Computation     Hybrid Journal   (Followers: 31)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 4)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Applied Mathematics and Physics     Open Access   (Followers: 3)
Biometrical Letters     Open Access  
British Actuarial Journal     Full-text available via subscription   (Followers: 2)
Bulletin of Mathematical Sciences and Applications     Open Access  
Communication in Biomathematical Sciences     Open Access   (Followers: 2)
Communications in Applied and Industrial Mathematics     Open Access   (Followers: 1)
Communications on Applied Mathematics and Computation     Hybrid Journal   (Followers: 1)
Differential Geometry and its Applications     Full-text available via subscription   (Followers: 4)
Discrete and Continuous Models and Applied Computational Science     Open Access  
Discrete Applied Mathematics     Hybrid Journal   (Followers: 10)
Doğuş Üniversitesi Dergisi     Open Access  
e-Journal of Analysis and Applied Mathematics     Open Access  
Engineering Mathematics Letters     Open Access   (Followers: 1)
European Actuarial Journal     Hybrid Journal  
Foundations and Trends® in Optimization     Full-text available via subscription   (Followers: 2)
Frontiers in Applied Mathematics and Statistics     Open Access   (Followers: 1)
Fundamental Journal of Mathematics and Applications     Open Access  
International Journal of Advances in Applied Mathematics and Modeling     Open Access   (Followers: 1)
International Journal of Applied Mathematics and Statistics     Full-text available via subscription   (Followers: 3)
International Journal of Computer Mathematics : Computer Systems Theory     Hybrid Journal  
International Journal of Data Mining, Modelling and Management     Hybrid Journal   (Followers: 10)
International Journal of Engineering Mathematics     Open Access   (Followers: 4)
International Journal of Fuzzy Systems     Hybrid Journal  
International Journal of Swarm Intelligence     Hybrid Journal   (Followers: 2)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 13)
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems     Hybrid Journal   (Followers: 3)
Journal of Advanced Mathematics and Applications     Full-text available via subscription   (Followers: 1)
Journal of Advances in Mathematics and Computer Science     Open Access  
Journal of Applied & Computational Mathematics     Open Access  
Journal of Applied Intelligent System     Open Access  
Journal of Applied Mathematics & Bioinformatics     Open Access   (Followers: 6)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 9)
Journal of Computational Geometry     Open Access   (Followers: 3)
Journal of Innovative Applied Mathematics and Computational Sciences     Open Access   (Followers: 11)
Journal of Mathematical Sciences and Applications     Open Access   (Followers: 2)
Journal of Mathematics and Music: Mathematical and Computational Approaches to Music Theory, Analysis, Composition and Performance     Hybrid Journal   (Followers: 12)
Journal of Mathematics and Statistics Studies     Open Access  
Journal of Physical Mathematics     Open Access   (Followers: 2)
Journal of Symbolic Logic     Hybrid Journal   (Followers: 2)
Letters in Biomathematics     Open Access   (Followers: 1)
Mathematical and Computational Applications     Open Access   (Followers: 3)
Mathematical Models and Computer Simulations     Hybrid Journal   (Followers: 3)
Mathematics and Computers in Simulation     Hybrid Journal   (Followers: 3)
Modeling Earth Systems and Environment     Hybrid Journal   (Followers: 1)
Moscow University Computational Mathematics and Cybernetics     Hybrid Journal  
Multiscale Modeling and Simulation     Hybrid Journal   (Followers: 2)
Pacific Journal of Mathematics for Industry     Open Access  
Partial Differential Equations in Applied Mathematics     Open Access   (Followers: 2)
Ratio Mathematica     Open Access  
Results in Applied Mathematics     Open Access   (Followers: 1)
Scandinavian Actuarial Journal     Hybrid Journal   (Followers: 2)
SIAM Journal on Applied Dynamical Systems     Hybrid Journal   (Followers: 3)
SIAM Journal on Applied Mathematics     Hybrid Journal   (Followers: 11)
SIAM Journal on Computing     Hybrid Journal   (Followers: 11)
SIAM Journal on Control and Optimization     Hybrid Journal   (Followers: 18)
SIAM Journal on Discrete Mathematics     Hybrid Journal   (Followers: 8)
SIAM Journal on Financial Mathematics     Hybrid Journal   (Followers: 3)
SIAM Journal on Imaging Sciences     Hybrid Journal   (Followers: 7)
SIAM Journal on Mathematical Analysis     Hybrid Journal   (Followers: 4)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 3)
SIAM Journal on Numerical Analysis     Hybrid Journal   (Followers: 7)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 12)
SIAM Journal on Scientific Computing     Hybrid Journal   (Followers: 16)
SIAM Review     Hybrid Journal   (Followers: 9)
SIAM/ASA Journal on Uncertainty Quantification     Hybrid Journal   (Followers: 2)
Swarm Intelligence     Hybrid Journal   (Followers: 3)
Theory of Probability and its Applications     Hybrid Journal   (Followers: 2)
Uniform Distribution Theory     Open Access  
Universal Journal of Applied Mathematics     Open Access   (Followers: 1)
Universal Journal of Computational Mathematics     Open Access   (Followers: 3)
Similar Journals
Journal Cover
Mathematical Models and Computer Simulations
Journal Prestige (SJR): 0.305
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2070-0490 - ISSN (Online) 2070-0482
Published by Springer-Verlag Homepage  [2469 journals]
  • Two-Dimensional Model for Calculation of the Working Process of a
           Spark-Ignited Engine

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      Abstract: A two-dimensional model of the working process—the preliminary analysis of calculations (PAC)—is developed for the preliminary planning of three-dimensional numerical calculations of the working process in spark-ignited engines. The model is based on solving the energy conservation equation in partial derivatives based on the control volume method with explicit identification of the flame front. A new approach to modeling flame propagation in a spark-ignited engine is proposed, which consists of a combination of the mesh method of control volumes and the calculation of the apparent flame velocity based on the experimental data (taking into account the stage of development of the flame source). In this case, there is no need to solve the momentum transfer equation and gas mixture components to determine the current position of the flame front. Thus, the advantages of this model are the fast execution of the calculation and good predictive ability. Additionally, the program can be used for preliminary verification of three-dimensional calculations when experimental data are not available, as well as for obtaining the heat release characteristics for zero-dimensional (thermodynamic) models of the working process.
      PubDate: 2022-08-01
       
  • Quasi-Hydrodynamic Approach for Simulating Internal Wave Attractors

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      Abstract: On the example of the problem of modeling wave attractors in a stratified fluid, the advantages of the quasi-hydrodynamic (QHDFoam) algorithm over the classical algorithm of operator splitting (PISO) are demonstrated. Both algorithms are implemented by the finite volume method based on the OpenFOAM open source software package. It is shown that the application of the PISO algorithm does not reproduce the dynamics of multiple reflection and focusing of internal waves in a stratified fluid during the interaction with the boundaries of the computational domain. The QHDFoam algorithm based on solving the regularized Navier–Stokes equations gives results close to the data of  the high-order spectral-element method, the data of which are considered as the reference in this study.
      PubDate: 2022-08-01
       
  • Entropic Regularization of the Discontinuous Galerkin Method in
           Conservative Variables for Two-Dimensional Euler Equations

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      Abstract: An entropic regularization of the conservative stable discontinuous Galerkin method (DGM) in conservative variables for two-dimensional Euler equations is constructed based on a special slope limiter. This limiter ensures the fulfillment of two-dimensional analogs of the monotonicity conditions and a discrete analog of the entropic inequality. The developed method was tested on two-dimensional model gas-dynamic problems.
      PubDate: 2022-08-01
       
  • Mathematical Model for Assessing the Information Impact on the Electorate
           in Social Media during Election Campaigns

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      Abstract: A mathematical model for assessing the informational impact on the electorate in social media during election campaigns is developed. It is based on the well-known mathematical models of information warfare in a structured society and differs from them by taking into account the stochastic nature of the intensity of information dissemination from external sources. The final model is reduced to a system of stochastic differential equations, understood in the sense of Ito. The estimate of the number of adherents and preadherents who favor a candidate during the election campaign is given by the sample mean, which is calculated by the probability density function determined from the solution of the Fokker–Planck–Kolmogorov equation. The Fokker–Planck–Kolmogorov (FPK) equation is solved according to the proposed numerical scheme based on the projection formulation of the Galerkin method. The simulation results for the test problem are presented.
      PubDate: 2022-08-01
       
  • Simulation of SN2009ip Bolometric Light Curves

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      Abstract: The direct method for determining cosmological distances uses observations at the growth stage of the luminosity of superluminous supernovae, whose light curve can be explained by the interaction of a shock wave with dense circumstellar matter. The method is based on the assumption of spherical symmetry of the dense thin layer formed in the system, which can be unstable in a multidimensional model. In this paper, we consider the simulation of the supernova SN2009ip, which has been successfully applied for the direct method, using the radiation-hydrodynamics code, FRONT. It is shown that the current implementation of the code correctly reproduces the bolometric light curve and the dynamics of the dense shell’s motion in a simplified SN2009ip model. It is also shown that in the formulation under consideration, the shell remains spherically symmetric at least during the growth period of the light curve.
      PubDate: 2022-08-01
       
  • Determination of Thermal Properties of Gold in the Region of
           Melting–Crystallization Phase Transition: Molecular Dynamics Approach

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      Abstract: Molecular dynamics (MD) modeling of the thermophysical properties of pure metallic gold (Au) and hysteresis is considered in order to study its behavior during melting–crystallization phase transformations, i.e., in the transition from solid to liquid. The results of computational experiments are presented, in which the temperature dependences of a number of thermophysical characteristics of the metal are obtained. The possibility of the formation of highly superheated metastable states of the solid phase upon rapid heating of Au has been confirmed.
      PubDate: 2022-08-01
       
  • Simulation of the Capacitor Discharge Current in the Bremsstrahlung of an
           Electron Accelerator

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      Abstract: A physical experiment performed to test a mathematical model for the generation of bremsstrahlung by electrons and the formation of an electromagnetic field during its scattering is considered. During the experiment, a high-current electron accelerator irradiates the converter target. The resulting bremsstrahlung generates a flux of emission electrons and an electromagnetic field in a sealed chamber. A mathematical model of the measuring circuit used for the experimental determination of the electric current in the chamber is developed. The results of physical and computational experiments simulating them coincide with satisfactory accuracy. It is established that the necessary condition for confirming the model is to take into account the measuring equipment in the computational experiment and use directly measured values for comparison.
      PubDate: 2022-08-01
       
  • Simulation of Gas Ionization by Fast Electrons

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      Abstract: The impact ionization of a rarefied gas by high-energy electrons is considered. An approximate hydrodynamic model of the current density of low-energy secondary electrons formed during impact ionization is constructed. The concentration, drift velocity, and specific energy are calculated by an approximate solution of the kinetic equation for secondary electrons. Spatial homogeneity, isotropy of the initial distribution of secondary electrons, coincidence of the direction of their drift and the electric field are assumed. Additional approximations are related to the structure of the distribution function of secondary electrons and cross section averaging. The results of model validation by comparison with direct collision simulation are presented.
      PubDate: 2022-08-01
       
  • Modeling the Piezoconductivity Process of a Two-Phase Fluid System in a
           Fractured-Porous Reservoir

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      Abstract: Mass transfer in a carbonate reservoir of a fractured-porous type is considered. Such reservoirs have a natural system of destruction in the form of fractures and cavities. In this paper, a mathematical model of the fluid redistribution between a porous-type matrix and a network of natural fractures is proposed and studied. The resulting system of differential equations is quasi-linear and quite complex. A number of difficulties arise in its numerical solution. First, the system contains a large number of unknown functions. Second, the nature of the nonlinearity of the equations is such that the corresponding linearized system no longer has the property of the self-adjointness of the spatial differential operators. To solve this problem, the method of splitting by physical processes and the approximation of differential operators by the finite difference method are used. The resulting split mesh model is equivalent to the discrete original balance equations of the system (conservation of mass components of fluids and total energy of the system) written in the divergent form. This approach is based on a nonlinear approximation of mesh functions in time, which depends on the fraction of the volume occupied by fluids in the pores, and is simple to implement. This paper presents the results of numerical calculations and analyzes the space-time dynamics of pressure change processes.
      PubDate: 2022-08-01
       
  • MHD Simulation of the Supernova Remnant Dynamics Taking into Account the
           Neutral Plasma Component

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      Abstract: The technique and results of three-dimensional modeling of a radiative shock wave that occurs when a supernova remnant expands into the surrounding interstellar medium are presented. The aim of the calculations is to analyze the hydrodynamic instability in a dense layer of matter formed during the deceleration of the remnant in the interstellar gas. The layer structure, which largely determines the efficiency of cosmic ray generation, depends on a number of factors and, in particular, on the rate of radiative cooling of the interstellar plasma, the magnitude of the magnetic field, and the presence of a neutral component in the ionized medium. The creation of a methodology and software for assessing these factors is the defining motivation for this work. For modeling, the MARPLE3D software package (Keldysh Institute of Applied Mathematics, Russian Academy of Sciences) is used, which was developed to solve problems of magnetic radiative gas dynamics on high-performance computing systems of the cluster type.
      PubDate: 2022-08-01
       
  • Development of a Method for Calculating Flows in Multicircuit Pipeline
           Networks

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      Abstract: This study is devoted to the development of a method for calculating the process of a nonstationary flow of compressible fluid in a pipeline network based on a system of quasi-one-dimensional (averaged over the cross section of a pipe) equations of mass and energy and momentum conservation equations. A finite-difference scheme and the corresponding calculation algorithm implemented in a program computer code are constructed. The difference scheme has the property of conservatism with the fulfillment of grid analogs of the main conservation laws and satisfies the stability and monotonicity criteria of the solution. The proposed solution method consists of reducing the calculation of the flow in a multicircuit network of pipes with a large number of junctions and branches to a set of three-point sweeps performed independently on each pipe. The advantage of the method is the possibility of natural parallelization of the computational process. In relation to this, the method is promising for use in multiprocessor systems. Examples of numerical calculations by the developed method are given.
      PubDate: 2022-08-01
       
  • Coupled Simulation of Gasdynamic and Elastoplastic Phenomena in a Material
           under the Action of an Intensive Energy Flux

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      Abstract: A complex computer model of thermomechanical phenomena and a technique for end-to-end modeling of processes occurring in a solid material under the action of an intense energy flux are developed. Using the example of calculating the impact on a polymer material, the dynamics of nonlinear wave processes leading to internal damage in a sample of the material and spalling phenomena are discussed. The created software can be used in the analysis of the results of intense energy impacts in engineering practice, verification of models of volumetric fractures, and spallation in brittle materials, as well as validation of wide-range equations of state.
      PubDate: 2022-08-01
       
  • Supercomputer Simulation of Hydrobiological Processes of Coastal Systems

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      Abstract: This paper discusses supercomputer modeling of the dynamics of plankton populations, including phyto- and zooplankton, in coastal systems. The mathematical model of the dynamics of plankton populations includes a system of convection-diffusion-reaction equations with nonlinear terms, which makes it possible to study the mechanism of external hormonal regulation based on the scenario approach. The proposed mathematical 3D model is linearized, discretized, and based on coordinate splitting, a chain consisting of two-dimensional and one-dimensional problems is obtained. For the numerical implementation of the proposed mathematical model of hydrobiology of the coastal system in the form of a software module (SM), a multiprocessor computer system (MCS) designed for massively parallel computing is used; its use makes it possible to significantly reduce the running time of the SM. To improve the accuracy of calculations, a procedure is used to refine the solution on a sequence of condensing uniform rectangular grids. The effect of the mechanism of ectocrine regulation and the mode of intake of biogenic substances on the production and destruction processes of plankton is studied. The mathematical model includes a nonlinear dependence used to describe the growth rate of algae cells on the concentration of the metabolite, which made it possible to describe the ability of algae excretion products to control their growth even under conditions of the massive intake of pollutants. The approach used corresponds to modern ideas about the functioning of hydrobiocenosis. Based on the developed software toolkit, focused on the supercomputer, not only direct trophic interactions but also the actions of the products of the vital activity of individuals, which are mediated–chemical interactions, are studied.
      PubDate: 2022-08-01
       
  • A Numerical Study of the Effect of an Obstacle on the Flow around a
           Vertical-Axis Wind Turbine

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      Abstract: The results of numerical simulation of a vertical-axis wind turbine (VAWT) based on the solution of three-dimensional Reynolds-averaged Navier–Stokes equations with the Spalart–Allmaras turbulence model are presented. The results of parametric calculations of a viscous compressible flow under conditions simulating urban infrastructure for a helicoid-type wind turbine with three spirally twisted blades are presented.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030048
       
  • On Impact Ionization of Ions Modeling in the Distorted Waves Approximation

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      Abstract: Atomic and ion properties calculated in the Hartree–Fock–Slater quantum-statistical model are used in the direct calculation of the differential and total cross sections of electron impact ionization of singly ionized oxygen and nitrogen atoms by the distorted wave approximation. The convergence of the cross sections justifies applicability of the approximation for calculating the cross sections for impact ionization of ions by electrons in gas-plasma formations. The calculated cross sections are compared with analytical approximations and available experimental data. The calculation results show that the proposed method gives reliable results, which, combined with the applicability of the Hartree–Fock–Slater model in a wide range of temperatures and densities, allow it to be used in a wide range of energies and ion charges.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030164
       
  • Mixed Convection Flow across a Vertical Cone with Heat Source/Sink and
           Chemical Reaction Effects

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      Abstract: This contribution is concerned with mixed convection flow across a vertical cone in the presence of heat source/sink and chemical reaction effects; the two-dimensional, steady, laminar, viscous incompressible fluid flow case has been discussed with favorable applications in the science, engineering, and industries. The flow model is designed in the form of mathematical equations and, for the sake of numerical solution simplicity, non-dimensionalization has been performed and the gained non-similarity equations are solved numerically via an efficient numerical technique called the bivariate Chebyshev spectral collocation quasi-linearization method. A schematic illustration of the obtained results at various stream-wise locations of the velocity, temperature, and concentration profiles for variations of the governing parameters are exhibited in the results and discussions section; and we have noted that higher rate of heat generation made heat transfer to the surface from the flow, and it enhances temperature profile as well. Moreover, skin friction, heat, and mass transfer rate are also illustrated in tabular form. To authenticate the accuracy of the present computations, we organize a favorable comparison with prior published computation; the residual analysis study also depicted which determines the convergence of the framed numerical simulation.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030127
       
  • Computing System for Modeling Sea Currents Using Regularized Shallow Water
           Equations

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      Abstract: A computer system for modeling sea currents, which is based on a hydrodynamic model with regularized shallow water equations, is presented. A system of regularized equations is presented and a technique for solving it is briefly described, including an algorithm for calculating dry-bed areas. The efficiency of the program code’s parallelization is tested on a high-performance computing system. The acceleration curve is obtained. The structure of the program and its interaction with external modules are presented. Test calculations of tidal fluctuations in the northern seas are carried out. The computational domain covers the White Sea, the Pechora Sea, parts of the Barents and Kara seas, and the Kara Strait. The results describe well the tidal phenomena in the study area.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030097
       
  • Linear Stability Analysis in a Mixed-Order Reaction–Subdiffusion
           System

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      Abstract: In this study, we consider a two-component medium with subdiffusive transport and nonlinear chemical kinetics. Formally, such a system can be represented as coupled equations with Caputo derivatives of various orders. It is shown by means of linear analysis that the ratio of the indices of fractional derivatives significantly affects the selection of patterns that may occur in the system. A new type of bifurcations is also demonstrated, which cannot be observed in a similar system with ordinary derivatives. The analysis carried out is supplemented by the results of direct numerical simulation.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030176
       
  • Mathematical Modeling of the Dynamics of a Low-Flying Spacecraft with a
           Ramjet Electric Propulsion Engine

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      Abstract: The motion of a spacecraft (SC) in an ultralow orbit at a height of 175 km is simulated. The SC is equipped with a ramjet electric propulsion engine (REPE), which makes it possible to compensate the drag force. The controllable angular motion of the SC is simulated taking into account the main disturbing factors, including errors in the layout of the SC and engine installation, as well as the effect of wind in the atmosphere. The energy consumption of the control system in different attitude modes is estimated.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030139
       
  • Numerical Simulation of Sound Pressure for an LS-Type Calibration System
           of Measurement Microphones

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      Abstract: The results of modeling sound pressure in the calibration system of measurement microphones of the LS type based on the reciprocity method and using the quasi-gas dynamic (QGD) approach in the frequency range from 1 Hz to 10 kHz are presented. A numerical method based on QGD equations for a compressible viscous heat-conducting gas is constructed using an explicit scheme, the finite difference method for a uniform grid with the approximation of spatial derivatives through central differences, and the fictitious node method to approximate the boundary conditions. The Mach numbers ranging from 7.3 × 10–10 to 7.3 × 10–6 are a feature of the computational problem in the studied frequency range. The close agreement of the modeling results with the known analytical solution points to the applicability of the QGD approach for modeling gas flows with extremely small Mach numbers and acoustic problems in particular.
      PubDate: 2022-06-01
      DOI: 10.1134/S2070048222030061
       
 
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