Abstract
Simulations were carried out of a 24° compression ramp in Mach 2.25, turbulent flow. In addition to simulations of the baseline flow, calculations were carried out with flow control applied, in the form of a streamwise body force with a wall-normal profile chosen to match a perturbation velocity profile previously identified through conditional averaging. Forcing in the upstream boundary layer with this particular form was found to drive large-scale separation unsteadiness downstream. Power spectral densities of the wall pressure fluctuations in the separated region displayed a low-frequency component that increased in proportion to the amplitude of forcing. The separation location and separation shock location were both observed to be synchronized with the forcing. These results are consistent with the Plotkin model of separation unsteadiness, and present an example of a case where large-scale separation motion is sensitive to external disturbances.
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