Three single equation turbulence models were applied to a test case of a Ma
ch 9 flow over a 38 deg ramp. None of the models have been optimized to hig
h-speed flows. Results indicate that the R-t closure outperforms both the S
palart-Allmaras and Menter's models in predicting this flow. Since the R-t
model's formulation is also topography-parameter-free, it seems to be the b
est choice for use in hypersonic heat transfer prediction within the single
equation closure family.