Effects of Actuation Frequency on Flow Control Applied to a Wall-Mounted Hump

摘要

A large-eddy simulation was performed over a wall-mounted hump model to test the effectiveness of high-frequency actuation, F+ ≥ 5, versus low-frequency actuation at F+ ～ O(1) at a momentum coefficient of 0.11 %. It was found that, for the locations and momentum coefficients tested, that high-frequency actuation did not improve the mean separation bubble length. Close examination of the M = 0.6 case compared with the M = 0.25 case revealed a slight delay in reattachment for the higher Mach number, whereas the low Mach number was approximately the same as the baseline flow, which may indicate that compressibility plays a role in the high-frequency actuation regime.