Numerical Simulation Of Chemical Non-equilibrium Flow

In this thesis, strategies for solving interior flows have been introduced. Nonequilibrium flows in COIL were simulated by solving the Reynolds averaged Navier-Stokes equations and species continuity equations.An algebraic method marching along the normal-to-wall direction, viscous grids around complex geometries are generated. GRIDGEN has been introduced to generate viscous grids around complex geometries.Some time stepping schemes, explicit four stages modified Runge-Kutta scheme, implicit LU-SGS and an implicit time-stepping scheme, are used to solve 2-dimensional compressible N-S equations. Two spatially discrete schemes about the convection terms of the N-S equations: the centered difference with artificial viscosity by Jameson and the Roe scheme of flux difference splitting are studied respectively. One-equation S-A model is applied to simulate turbulent flows. The flow field on the upper half of a 10% thick circular arc "bump on a wall" is simulated. The results are in a good agreement well with the data of literature. And the numerical simulation of the flows in the SAJBEN diffuser is also presented as an example to demonstrate the efficacy of the approach. The results are in good agreement with the analysis and the experimental results. Flows in COIL were also simulated.Nonequilibrium flows in COIL were simulated by solving the Reynolds averaged Navier-Stokes equations and species continuity equations. Equations were solved using the cell-centred finite volume spatial discretization and four-stage Runge-kutta time-stepping scheme on structured viscous mesh. The method employs finite-rate chemistry and thermodynamic perfect gas properties for reaction. The stiffness problem was overcome by a relaxation iterative scheme. The results are in good agreement with the analysis and the experimental results.