Semi-empirical wall pressure spectral modeling for zero and favorable pressure gradient flows.

Abstract

Semi-empirical models are used to predict the power spectral density of wall pressure fluctuations in the turbulent boundary layer. Current advancements in power spectral density wall pressure fluctuation prediction have focused on expanding the range of experiments that can be predicted to include adverse pressure gradient flows; however, favorable pressure gradient flows have not received much attention. An experiment was performed to capture the effects of the favorable pressure gradient on the power spectral density. A model was then created to improve upon some of the limitations of existing models. The proposed model improves upon the prediction of the high-frequency roll-off location, incorporates improvements made by past models, and captures the effects of favorable pressure gradients.