Discrete unified gas kinetic scheme for diatomic gas with rotational degrees of freedom

被引：0

作者：

Yao B. ^{[1
]}

Zhang C. ^{[1
]}

Guo Z. ^{[1
]}

机构：

[1] State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan

来源：

Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2019年 / 40卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Diatomic molecular; Discrete unified gas kinetic scheme; Multi-scale flow; Non-equilibrium flow; Rotational degrees of freedom;

D O I：

10.7527/S1000-6893.2019.22914

中图分类号：

学科分类号：

摘要：

The Discrete Unified Gas Kinetic Scheme (DUGKS) is a finite volume method suitable for all Knudsen number regimes. Previous studies considering molecular translational degrees of freedom have verified the accuracy and stability of DUGKS in multiscale problems. In this paper, the DUGKS is constructed based on the Rykov gas kinetic equation, and the Landau-Teller-Jeans rotational energy relaxation model is used. Then the DUGKS can be used in multiscale problem calculation from continuum flow to rarefied flow for diatomic gases. Some non-equilibrium cases, such as one-dimensional shock structure, the hypersonic flow passing a flat plate, and the hypersonic flow around a cylinder have been tested. The results show the existence of energy exchange process corresponding to the degrees of freedom of translation and rotation in diatomic gas molecules. And the calculation results are in good agreement with the Unified Gas Kinetic Scheme (UGKS), Direct Simulation Monte Carlo (DSMC), and experimental values. © 2019, Press of Chinese Journal of Aeronautics. All right reserved.

引用

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