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A Moving Mesh Method for Kinetic/Hydrodynamic Coupling

Published online by Cambridge University Press:  03 June 2015

Zhicheng Hu  and
Heyu Wang
Zhicheng Hu*
Affiliation:
Department of Mathematics, Zhejiang University, Hangzhou 310027, Zhejiang, China
Heyu Wang*
Affiliation:
Department of Mathematics, Zhejiang University, Hangzhou 310027, Zhejiang, China
*
URL: http://mypage.zju.edu.cn/wangheyu, Email: huzhicheng@zju.edu.cn
Corresponding author. Email: wangheyu@zju.edu.cn
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Abstract

This paper deals with the application of a moving mesh method for kinetic/hydrodynamic coupling model in two dimensions. With some criteria, the domain is dynamically decomposed into three parts: kinetic regions where fluids are far from equilibrium, hydrodynamic regions where fluids are near thermody-namical equilibrium and buffer regions which are used as a smooth transition. The Boltzmann-BGK equation is solved in kinetic regions, while Euler equations in hydrodynamic regions and both equations in buffer regions. By a well defined monitor function, our moving mesh method smoothly concentrate the mesh grids to the regions containing rapid variation of the solutions. In each moving mesh step, the solutions are conservatively updated to the new mesh and the cut-off function is rebuilt first to consist with the region decomposition after the mesh motion. In such a framework, the evolution of the hybrid model and the moving mesh procedure can be implemented independently, therefore keep the advantages of both approaches. Numerical examples are presented to demonstrate the efficiency of the method.

Keywords

65M5076P05Moving mesh methodkinetic/hydrodynamic couplingthe Boltzmann-BGK equation
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 4 , Issue 6 , December 2012 , pp. 685 - 702
Copyright
Copyright © Global-Science Press 2012

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