COMPUTATION OF 3-DIMENSIONAL HYPERSONIC FLOWS IN CHEMICAL NONEQUILIBRIUM

An algorithm for the simulation of three-dimensional hypersonic flows in chemical nonequilibrium is presented. The basic flow solver is base d on a quasiconservative formulation of the Euler or Navier-Stokes equ ations. The Jacobi matrices are split according to the sign of their e igenvalues. The derivatives of the conservative variables are split ac cordingly. A third-order upwind space discretization is used in conjun ction with an optimized three-stage Runge-Kutta explicit time stepping scheme. The chemistry source terms are treated point-implicitly. For inviscid flow, the code is applied to the complete HERMES 1.0 configur ation. The influence of mesh resolution is studied by comparing a fine grid with a coarse grid solution. The coarse grid solution is usually sufficient to describe global flow phenomena. The analysis of local f low details requires refined meshes. For viscous flow, the flow about generic configurations (double-ellipse, hemisphere-cylinder-flare, hyp erbola-flare) is investigated by performing grid sensitivity studies a s well as by comparing different transport models.