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Поляков, Сергей Владимирович

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Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.

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Поляков

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Сергей Владимирович

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Computation of 3D Water Flows by the Double Potential Method for the Simulation of Electromagnetic Water Purification
(2020) Tarasov, N.; Polyakov, S.; Kudryashova, T.; Поляков, Сергей Владимирович
In this paper, we discuss the modeling of the electromagnetic water purification. This model requires a velocity distribution in a study domain. For that purpose, the double potential method for simulating incompressible viscous fluid flows was used. The system of equations was discretized with the help of the finite volume method using an exponential transformation for the vortex calculation. As a result, a software implementation of the developed numerical scheme was obtained. The simulation of the three-dimensional flow was carried out in a study domain. The results were compared with Ansys CFD. The comparison showed a good degree of consistency between the two distributions. Using the obtained velocity field, we simulated the process of water purification using the induction of the electromagnetic field.
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Incompressible Viscous Flow Simulation Using the Quasi-Hydrodynamic Equations’ System
(2020) Tarasov, N. I.; Karamzin, Y. N.; Kudryashova, T. A.; Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© 2020, Pleiades Publishing, Ltd.Abstract: In this paper, we consider the problem of modeling viscous incompressible fluid flow using the quasi-hydrodynamic (QHD) system of equations. The use of this approach makes it possible to avoid instability in the pressure calculation when using the classical formulation of the Navier–Stokes equations, which is manifested when using cellular numerical schemes. For the numerical implementation of QHD equations, the finite volume method is used with cell-center approximation. In the case of a two-dimensional problem a square mesh is used. A cubic mesh is used in the case of a three-dimensional problem. Two series of calculations are performed for testing in areas of complex geometry for several Reynolds numbers. The results are compared with the ANSYS CFX software package. The comparison shows the high quality of the numerical simulation results using the QHD system of equations.
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Molecular Dynamic Calculation of Macroparameters of Technical Gases by the Example of Argon, Nitrogen, Hydrogen, and Methane
(2020) Podryga, V. O.; Vikhrov, E. V.; Polyakov, S. V.; Поляков, Сергей Владимирович
© 2020, Pleiades Publishing, Ltd.Abstract: This work is devoted to the molecular dynamic calculations of the properties of technical gases, whose study is a traditional problem of physics of matter. At present, there is increased interest in this problem due to the development of nanotechnologies and their introduction in various industries. The gases’ properties required for simulation are expressed as a set of macroparameters, including kinetic coefficients; parameters of the equation of state; and values of kinetic, potential, total, and internal energies. The study was performed for technical gases such as argon, hydrogen, nitrogen, and methane at a pressure of 1 atm and in the temperature range from 100 to 400 K. The obtained calculated data on the macroparameters of gases is in good agreement with the known theoretical estimates and experimental data.
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Problems of coordinating the solutions of quasigasdynamic equations with results of molecular-dynamic calculations in analysis of real gas flows
(2019) Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© Published under licence by IOP Publishing Ltd. This paper is devoted to the numerical study of complex gas-dynamic processes in microchannels of technical systems. The analysis is carried out on the basis of the equations of quasigasdynamics, taking into account the real dependences of the equation of state and kinetic coefficients on temperature and pressure, as well as the realistic description of the channel walls. As an example, the flow of nitrogen in the nickel channel of the actual structure is selected. The task is considered in the context of a multiscale approach. The main idea of this approach is to combine models of continuum with models of particles. Combining models is implemented in the framework of the method of splitting by physical processes. The correctness of this approach is ensured by the selection of suitable time intervals and the conjugation of scale levels. The goal is to develop a numerical algorithm that integrates grid methods for solving quasigasdynamic equations and molecular dynamics method, allowing to take into account the properties of real substances in the general model. In work the method of coordination of numerical solutions at different scale levels in time and space is investigated. Based on the proposed methodology, direct molecular modeling of the flow in the channel was carried out and data were prepared for calculating such a flow using the equations of quasigasdynamics. The study confirmed the possibility of synthesizing these two numerical methods.
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Molecular dynamic modeling of metal nanocluster motion caused by gas flow influence
(2019) Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© 2019 Author(s).The paper is devoted to supercomputer molecular modeling of gas dynamic spraying of nanoparticles on the substrate. The urgency of this problem is related to the development of production technologies for promising nanocoatings and nanomaterials. The observed increase in the power of modern computer and supercomputer systems makes it possible to use mathematical models based on the first principles in numerical experiments. One of such models is the molecular dynamics method. In this paper, a new technique and the results of using this model for calculating the acceleration of a nickel nanocluster by a nitrogen flow are presented.
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Multiscale Mathematical Modeling of the Metal Nanoparticles Motion in a Gas Flow
(2019) Podryga, V.; Polyakov, S.; Поляков, Сергей Владимирович
© 2019, Springer Nature Switzerland AG.The paper is devoted to modeling the motion of metal nanoparticles in a gas flow. Two different ways are proposed to solve the problem. The first way is based on the use of the molecular dynamics method, the second method is based on the use of the multiscale approach combining the quasigasdynamic equations system and the molecular dynamics method. A cluster of nickel atoms is considered as a metallic nanoparticle, a flow of nitrogen molecules is considered as a gas flow. In numerical experiments, the conditions for matching the applied mathematical models and the behavior of the nanoparticle are determined.
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Finite Difference Schemes on Locally Refined Cartesian Grids for the Solution of Gas Dynamic Problems on the Basis of Quasigasdynamics Equations
(2019) Karamzin, Y. N.; Kudryashova, T. A.; Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© 2019, Springer Nature Switzerland AG.The paper is devoted to the numerical solution of gas dynamic problems on the basis of a system of quasigasdynamic equations in domains of complex shape. One possible grid approach to solving this class of problems is used. An approach is applying to the locally refined Cartesian (LRC) grids, consisting of rectangles (parallelepipeds) of various sizes. In this paper some variants of the construction of finite difference schemes in the two-dimensional case are considered. Their order of approximation is investigated. The analysis of the schemes is carried out numerically on the example of two-dimensional problem of gas flow under conditions of the real equation of state.
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Construction of Higher-Order Approximation Difference Scheme for Nonlinear Convection-Diffusion Equation Using Adaptive Artificial Viscosity in Case of Two-Phase Filtering Problems
(2019) Popov, I. V.; Poveshchenko, Y. A.; Polyakov, S. V.; Попов, Игорь Викторович; Повещенко, Юрий Андреевич; Поляков, Сергей Владимирович
© 2019, Springer Nature Switzerland AG.The method of adaptive artificial viscosity is used to model the process of one-dimensional nonlinear convection-diffusion equation. For this purpose, a finite difference scheme (FDS) of the second order of time and space approximation has been developed. The scheme was tested using a numerical solution of the problem on formation of a gradient catastrophe. The process of two-phase filtration was analyzed with the help of constructed FDS. Numerical calculations showed that the proposed method, and in this case reliably tracks the discontinuities of the solution.
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Investigation of gas-dynamic processes in a boundary layer on a basis of molecular dynamics simulation
(2019) Kuryashova, T. A.; Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© Published under licence by IOP Publishing Ltd.The work is devoted to numerical simulation of the nonlinear gas dynamic processes in technical systems of micron sizes. This problem is relevant for many applications related to the implementation and the use of nanotechnology in various industries. As an example, a gas flow in micro channel with metal walls is considered. Within this problem, we are interested in a calculation of the boundary layer parameters from first principles. The numerical analyses are carried out according to the Newton's equations of classical dynamics. The model under consideration takes into account the molecular composition of the gas, the atomic structure of the metal surfaces, and heat exchange of the gas with the metal. Computer implementation is focused on using high-performance systems with hybrid architecture. The calculations are performed on the example of a nitrogen flow into a nickel micro channel for several micro channel lengths. The flow velocity varied over a wide range. It is considered in the subsonic, transonic, and supersonic ranges. In numerical experiments, macro parameters of gas flow in the boundary layer are obtained and the corresponding near-wall model is formed. It can be used for the calculation of flows in micro channels using continuum mechanics methods.
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Atomistic Modeling of Metal Nanocluster Motion Caused by Gas Flow Impact
(2019) Podryga, V. O.; Polyakov, S. V.; Поляков, Сергей Владимирович
© 2019, Pleiades Publishing, Ltd.The work is devoted to supercomputer molecular modeling of gas dynamic spraying of nanoparticles on the substrate. The urgency of this problem is related to the development of production technologies for promising nanocoatings and nanomaterials. The observed increase in the power of modern computer and supercomputer systems makes it possible to use mathematical models based on the first principles in numerical experiments. One of such models is the molecular dynamics method. In this paper, a new results of using of direct molecular simulation for calculating of the acceleration of a nickel nanocluster by a nitrogen flow are presented. The data obtained in the calculations allow to optimize the parameters of the accelerating gas system and predict the speed characteristics of the nanocluster near the substrate surface.