Evaluation of BGK-type Models of the Boltzmann Equation | |
Gao W(高巍); Sun QH(孙泉华) | |
Source Publication | AIP Conf. Proc. 1628 |
2014-12 | |
Pages | 84 |
Conference Name | the 29th International Symposium on Rarefied Gas Dynamics |
Conference Date | July13-18,2014 |
Conference Place | Xi'an, China |
Abstract | A BGK-type model is a simplified model to the Boltzmann equation where the complicated collision integral is approximated using a simple relaxation term. In this paper, a generalized BGK-type model is proposed by combining the original BGK, Shakhov and ellipsoidal statistical models. To verify the new model, theoretical and numerical analysis is performed. The Chapman-Enskog expansion shows that the generalized model can recover the Navier-Stokes-Fourier and Burnett equations by choosing properly the introduced parameters. In addition, the collision term of the model is evaluated for several designed relaxation problems. Results show that the new model can match the results of third-order moments obtained with DSMC method by adjusting the free parameters. |
Department | LHD微尺度和非平衡流动 |
URL | 查看原文 |
Language | 英语 |
Document Type | 会议论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/49428 |
Collection | 高温气体动力学国家重点实验室 |
Recommended Citation GB/T 7714 | Gao W,Sun QH. Evaluation of BGK-type Models of the Boltzmann Equation[C]AIP Conf. Proc. 1628,2014:84. |
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