One-Dimensional Non-Linear Non-Stationary System of Boltzmann Moment Equations in the Fifth Approximation with a Macroscopic Boundary Condition
Akimzhanova S.
April 2025Engineered Science Publisher
Engineered Science
2025#34
The present study is devoted to the one-dimensional system of Boltzmann moment equations in the fifth approximation and macroscopic boundary conditions. The microscopic Maxwell boundary condition for the one-dimensional Boltzmann equation was approximated and boundary conditions for the one-dimensional non-linear non-stationary Boltzmann moment system in the fifth approximation were derived. The initial boundary value problems for the fifth approximation of the Boltzmann moment system with macroscopic boundary conditions were formulated. The system of Boltzmann moment equations represents a non-linear symmetric system of hyperbolic equations. The first part substantiates the existence and uniqueness of the solution to the initial boundary value problem for the one-dimensional system of Boltzmann moment equations in the fifth approximation with macroscopic boundary conditions in the space of functions that are continuous in time and square-summable over the spatial variable. In the second part, using a numerical method, an approximate solution to the initial boundary value problem for the system of Boltzmann moment equations is determined. The differential problem is approximated by a finite-difference scheme, and an algorithm and program for numerical implementation on a computer are compiled. At the end of the article, tables of values and graphs of the moments of the particle distribution function corresponding to the fifth approximation of the moment equations are presented.
Macroscopic boundary conditions , Microscopic maxwell boundary condition , One-dimensional non-linear non-stationary of Boltzmann equation , System of Boltzmann moment equations
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Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Satbayev Kazakh National Technical Research University, Almaty, 050013, Kazakhstan
Al-Farabi Kazakh National University
Satbayev Kazakh National Technical Research University
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