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KIAM Preprint  31, Moscow, 2023
Authors: Bobylev A.V., Kuksin S.B.
Boltzmann equation and wave kinetic equations
Abstract:
The well-known nonlinear kinetic equations (in particular, the wave kinetic equation and the quantum Nordheim Uehling Uhlenbeck equations) are considered as a natural generalization of the classical spatially homogeneous Boltzmann equation. To this goal we introduce the generalized kinetic equation that depends on a function of four real variables F(x1; x2; x3; x4). The function F is assumed to satisfy certain commutation relations. The general properties of this equation are studied. It is shown that the above mentioned kinetic equations correspond to different forms of the function (polynomial) F. Then the problem of discretization of the generalized kinetic equation is considered on the basis of ideas which are similar to those used for construction of discrete models of the Boltzmann equation. The main attention is paid to discrete models of the wave kinetic equation. It is shown that such models possses a monotone functional similar to Boltzmann H-function. The behaviour of solutions of the simplest Broadwell model for the wave kinetic equation is discussed in detail.
Keywords:
Boltzmann equation, wave kinetic equations, Broadwell model
Publication language: russian,  pages: 20
Research direction:
Mathematical problems and theory of numerical methods
Russian source text:
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About authors:
  • Bobylev Alexander Vasilievich,  orcid.org/0000-0001-9348-0864KIAM RAS
  • Kuksin Sergei Borisovitch,  orcid.org/0000-0003-2322-2821RUDN University