关键词: 非结构网格, MHD方程, 化学非平衡, 逆风格式

Abstract:

Two dimensional（2D）hypersonic magnetohydrodynamics(MHD) flows around a blunt body with chemical non-equilibrium effects are numerically simulated on unstructured meshes. The governing equations are 2D idea MHD equations and continuous equations of species, where five species and seventeen reactions are considered The AUSM scheme is implemented in the spatial discretization for the MHD equations, and an explicit fivestage Runge-Kutta scheme is used for time integration, then a loosely coupled approach is implemented to communicate between the MHD equations and the chemical model. The computational model is a 2D blunt body, and the magnetic field is generated by a dipole located inside the body. With hypersonic incoming flows, four different conditions are numerically simulated, and magnetic field and nonequilibrium chemical reactions are considered respectively. Compared with limited references, the numerical results show the feasibility of the numerical methods in simulating hypersonic MHD flows with nonequilibrium chemical reactions.

Key words: unstructured , meshes,  , MHD , equations,  , chemical , non-equilibrium,  , upwind , scheme