Detached eddy simulation of supersonic base flow with bleed

The impetus for this work comes from our attempts to accurately compute the base drag and other parameters in base flows. This paper deals mainly with the numerical issues that commonly used flow solvers attempting compressible turbulence are confronted with. An attempt is made at understanding the dissipative effect of our spatial dicretisation and implicit time marching on the overall dissipation. We perform a simple experiment on decaying compressible isotropic turbulence and observe a not imperceptible difference in the performance of our second and third order accurate flux vector splitting schemes. Next we compare three implicit time advancement methods and show that point implicit methods may be inadequate for accurate DES. A recent version of the Spalart-Allmaras turbulence equation incorporating density fluctuations is used in a simulation of a canonical base flow. Finally, we present a flow case involving base bleed and compare some statistics with experiment.