Abstract
A large fraction of the experimental database used for validation of computational fluid dynamics (CFD) predictions of shock-induced turbulent separated flows consists of time-averaged measurements. If meaningful conclusions are to be drawn from comparisons of these time-averaged data with computations, it is important to understand how the data are generated physically. This can be difficult and time consuming but is an essential element in the selection of an appropriate mathematical model for the computation. For the separated compression ramp interaction, which is widely used as a CFD test case, global unsteadiness is a dominant phenomenon. Without modeling the unsteadiness, accurate predictions of the time-averaged wall pressure, outgoing velocity profiles, and other parameters will likely remain elusive, irrespective of the turbulence model.
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