A Mach-uniform Pressure Correction Algorithm
Using AUSM Flux Definitions
Author(s)
K. Nerinckx, J. Vierendeels & E. Dick
Abstract
A collocated finite-volume pressure correction procedure for the solution of inviscid
compressible flow at all speeds is presented. Pressure correction methods usually
adopt a so-called Rhie-Chow interpolation for the cell face velocities in order
to provide pressure-velocity coupling. However, as is shown on the testcase of a
one-dimensional transonic nozzle, this Rhie-Chow interpolation becomes highly
diffusive in high Mach number flows, resulting in an extreme smearing of the
shock. Therefore we replace the Rhie-Chow interpolation for velocity and the
central interpolation for pressure by AUSM+ definitions. This results in a much
sharper shock capturing, even with a first order scheme. However, the diffusive
contributions of this flux scale badly when the Mach number diminishes. Furthermore,
press
Keywords
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