Flow-induced cavity oscillation exists in many practical environments, such as sunroofs in automobiles, landing gear bays and weapon bays on aircraft. The cavity pressure fluctuations can exceed 170 dB (ref 20 μPa) and can potentially cause fatigue failure of the cavity and its contents. In addition, the cavity pressure fluctuations can increase the drag on the aircraft. These pressure fluctuations contain tonal and broad band components which both need to be altered for many modern applications. Attempts at controlling the flow, so as to reduce the surface pressure fluctuations have been challenges to researchers. This study is concentrated on understanding the effects of “open loop” and “closed loop” on the flow field so that a better understanding of the most efficient way to control the flow can be developed.
