FAST EULER SOLVER FOR NONEQUILIBRIUM STEADY FLOWS

The Moretti's Fast Solver, based on the implicit solution of four compatibility equations, has shown to produce some unphysical behaviour in the strong relaxation layers occurring in reacting flows. In the paper a new formulation is presented which overcomes these drawbacks, while retaining the Riemann variable formulation which allows an efficient implicit integration of four separate bidiagonal equations. Moreover the scheme is extended to non orthogonal grids and its accuracy is raised to second order. The improvement of the solution quality is shown through the application to both reacting and non reacting flows over blunt bodies at hypersonic speeds.