NAVIER-STOKES COMPRESSIBLE 3D FLUID FLOW PREDICTIONS ON HYBRID UNSTRUCTURED GRIDS USING IMPLICIT MATRIX-FREE METHODS

摘要

A second-order accurate finite volume method for solving compressible 3D flows on hybrid structured-unstructured grids is presented. State-of-the-art accurate methods are used, among them, separate reconstruction and evolution steps to discretize the convective terms. Steady-state solutions are obtained with a matrix-free Newton-Krylov scheme, with GMRES as solver. Comparisons between predictions and either measurements or a analytical solution are performed for two steady test cases: a supersonic 10° ramp and the flow past a symmetric corner. The employed methods proved to be accurate when comparing the computed results with both experimental and analytical solutions.