Robust Computation of 3D Viscous Hypersonic Flow Problems

Summary

A symmetric TVD relaxation method to solve the three-dimensional Navier-Stokes equations for equilibrium real gas flows is presented. The coefficient matrix is based on a linearization with respect to density, velocity and total enthalpy which reduces the work to compute the elements of the flux matrices and provides a more robust algorithm. A subgrid procedure for the viscous layer around body surfaces is introduced to focus the relaxation on the part of the computational domain in which generally a less benign convergence behavior is encountered and, hence, to save computer time. Results are presented for some laminar and turbulent viscous hypersonic flows.