Numerical simulations of the flow due to injection of sonic jets into supersonic crossflows have been performed. Attention was focused on a particular case for which the earlier predictions had been poor. Improvement in prediction of the upstream separation location was demonstrated with higher-order formulas and known turbulence model corrections. As injection pressure increases, or a wider slot is used, all other conditions remaining the same, it was found necessary to have adequate resolution of the boundary layer as well as the region up to the Mach surface. Then, presently available Reynolds-averaged Navier-Stokes solutions are accurate over the full range of experiments considered, even though these flows are quite complex.
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