Large eddy simulation of transonic flow over a bump has been carried out. Transonic flows over an object typically contain shocks and unsteady flow separation. Due to sharp flow gradients and high Reynolds number together with large scale unsteadiness, the LES approach is most appropriate. The general flow was found to compare well with experimental results. The formation and motion of the shock system was studied. Additionally we consider the effects of driving pressure unsteadiness. Hysteretic and possibly chaotic behavior of the shock location at the bump surface was observed, depending on the driving pressure unsteadiness.
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