AMovingMeshMethod for Kinetic / Hydrodynamic

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 thermodynamical equilibrium and buffer regions which are used as a smooth transition. 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 step of the mesh moving, the solutions are conservatively updated to the newmesh and the cut-off function is rebuilt first to consist with the region decomposition after the mesh moving. 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. Numerical examples are presented to demonstrate validation and efficiency of the method. AMS subject classifications: to be provided by author 10