Features of the rarefied gas description in terms of a distribution function

Research output

Abstract

The aim of the paper is to determine the relationship of the classical model for describing a rarefied gas using the distribution function and its discrete representation. Here we study the role of discreteness in the description of a medium in the kinetic theory and the interrelation between interaction of the discreteness and the "continuity" of a media. The question of the relationship between the discreteness of a medium and its description with the help of continuum mechanics is important both when processing experimental data and when going from a continuum model to discrete one in mechanics and physics. There are many studies devoted to the influence of the transition from a continuous to discrete medium in computational mathematics, but there is no study of inverse processes. The work related to the formulation of conservation laws as conditions of the equilibrium of forces and moments of forces, as well as the action of additional flows on the sides of an elementary volume, was carried out earlier. After refinement, non-symmetric stress tensor was obtained. The method for calculating this tensor was proposed. The equations for a gas were found from the modified Boltzmann equation and from the phenomenological theory. Inaccuracy leading to the symmetry of the stress tensor arises when calculating the Lagrange function of particles as the sum of pairwise interacting particles and the unchanged position of the inertia system center.

Original languageEnglish
Article number012023
JournalJournal of Physics: Conference Series
Volume1250
Issue number1
DOIs
Publication statusPublished - 5 Jul 2019
Event12th International Conference on Aerophysics and Physical Mechanics of Classical and Quantum Systems, APhM 2018 - Moscow
Duration: 27 Nov 201829 Nov 2018

Scopus subject areas

  • Physics and Astronomy(all)

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