FLUX-VECTOR SPLITTING FOR COMPRESSIBLE LOW MACH NUMBER FLOW

Several problems are encountered when calculating low Mach number flow . We illustrate them from different points of view and investigate two flux-vector splittings designed for this type of flow. Both splitting s are applied to a quasi-1-D nozzle flow, using the explicit as well a s a semi-implicit and the implicit Euler scheme with a finite-volume u pwind formulation. Results at low and very low Mach numbers are compar ed with calculations using Roe's scheme. A von Neumann stability analy sis is carried out for the more promising scheme based on a convection -pressure splitting.