Numerical Simulation For 3-D Hypersonic Flows On Hybrid Meshes And Parallization

With the development of human being in sky exploration, more and more countries focus on the hypersonic technology (HyTech), which includes propulsion, aerodynamics, integration design etc. To be one of the fundamental techniques, aerodynamics and aero-thermal-dynamics have been paid more attention than others. Limited by the wind tunnel experimental techniques and facilities, numerical simulation methods for hypersonic flows become an important way in this research field.This thesis focus on parallel numerical methods for hypersonic chemical-thermal nonequilibrium flows on hybrid meshes. The flows are modeled by Euler/N-S equations with air flow chemical reaction effects. Numerical schemes, such as Jameson type scheme, AUFS scheme etc. are developed and parallelized on distributed machine environment.a) 3D hypersonic chemical nonequilibrium flows. Spatial discretization for control equations, Jameson and AUFS, is a finite volume cell-centered type, explicit five-stages Runge-Kutta scheme for flow time stepping. Chemical kinetic model implemented is 7-species air reaction, single temperature model. A point implicit scheme is used for the chemical source term in order to solve the stiffness problems, a Newton iterative method for flow field temperature distribution.b) 2D thermochemical nonequilibrium flows. Based on the results of the first part, a two-temperature model is employed for thermochemical nonequilibrium effects. The Millikan-White relaxation model modified by Park is used for the calculation of the vibrational relaxation time.c) Distributed parallelization. The domain decomposition method(DDM) is developed for hybrid meshes on consideration of load balance. Data structure, between sub-domains and global domain, among sub-domains, are defined, and a suitable parallelization scheme for hypersonic flow solvers.Comparable numerical test cases, 2D and 3D configurations with different flow conditions, are obtained, which shows the verification, validation, high efficiency and robustness of the numerical schemes developed in this thesis.