On group symmetries of the hydrodynamic equations for rarefied gas

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-01-01 DOI:10.3934/KRM.2021012

A. Bobylev, S. Meleshko

引用次数: 2

Abstract

The invariant group transformations of three-dimensional hydrodynamic equations derived from the Boltzmann equation are studied. Three levels (with respect to the Knudsen number) of hydrodynamic description are considered and compared: (a) Euler equations, (b) Navier-Stokes equations, (c) Generalized Burnett equations (GBEs), which replace the original (ill-posed) Burnett equations. The main attention is paid to group analysis of GBEs in their most general formulation because this and related questions have not been studied before in the literature. The results of group analysis of GBEs and, for comparison, of similar results for Euler and Navier-Stokes equations are presented in two theorems and discussed in detail. It is remarkable that the use of computer code greatly simplifies the proof of the results for GBEs, which are very cumbersome equations with many undetermined parameters.

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稀薄气体流体动力方程的群对称性

研究了由玻尔兹曼方程导出的三维流体动力方程的不变群变换。考虑并比较了流体力学描述的三个层次(相对于Knudsen数):(a)欧拉方程，(b) Navier-Stokes方程，(c)广义伯内特方程(GBEs)，它取代了原始的(不适定的)伯内特方程。主要关注的是gbe在其最一般的形式的群体分析，因为这和相关的问题还没有在以前的文献研究。在两个定理中给出了gbe的群分析结果，并对欧拉方程和Navier-Stokes方程的类似结果进行了比较，并进行了详细的讨论。值得注意的是，使用计算机代码大大简化了GBEs结果的证明，这是非常繁琐的方程，有许多待定参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.