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Yury Poveshchenko Viktoriia Podryga Orkhan Rahimly 《Mathematical Methods in the Applied Sciences》2020,43(13):7825-7833
When constructing difference schemes for calculating complex problems of computational astrophysics considering magnetohydrodynamic and gravitational phenomena, the processes of matter overcompression (with a change in density by several orders of magnitude) should be taken into account, and it is important at a discrete level to take into account the corresponding energy transformations of magnetohydrodynamic, gravitational, kinetic, and internal energy during the evolution of a star. This problem is solved by constructing completely conservative difference schemes in a view of these magnetohydrodynamic processes and self-gravitating phenomena. In this work, to study and apply the difference methods for solving problems of magnetic gas dynamics, a discrete representation of symmetrized spatial deformations of the medium was obtained. The representation is consistent with changes in the magnetic, kinetic, and internal energies and does not lead to their distortions when the matter is overcompressed. 相似文献
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Poveshchenko Yu. A. Kazakevich G. I. Podryga V. O. Rahimly P. I. 《Doklady Mathematics》2022,105(3):162-165
Doklady Mathematics - This work is devoted to the mathematical modeling of the dissociation of gas hydrates in a porous medium. Numerical methods are developed for solving problems of underground... 相似文献
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V. O. Podryga 《Doklady Mathematics》2016,94(1):458-460
A multiscale approach to computing real gas flows in engineering microchannels on high-performance computer systems in a wide range of Knudsen numbers is described. The numerical implementation of the approach combines the solution of quasigasdynamic equations and the molecular dynamics method. Following the approach, the parameters of the real gas equation of state are found at the molecular level, the kinetic gas properties are calculated, and the form of boundary conditions on the microchannel walls are determined. The technique is verified by computing several test problems. The results agree well with available theoretical and experimental data. 相似文献
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Krukovskii A. Yu. Poveshchenko Yu. A. Podryga V. O. Rahimly P. I. 《Computational Mathematics and Mathematical Physics》2021,61(4):638-645
Computational Mathematics and Mathematical Physics - A finite-difference approximation of elastic forces on Lagrangian grids is constructed by applying the support operator method. For displacement... 相似文献
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Gasilov V. A. Poveshchenko Yu. A. Podryga V. O. Rahimly P. I. 《Computational Mathematics and Mathematical Physics》2020,60(1):134-143
Computational Mathematics and Mathematical Physics - The dynamics equations for a two-component fluid in a porous medium with gas hydrate inclusions are approximated on a structurally irregular... 相似文献
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