Cavity flow oscillation analysis and water table simulation

Under certain conditions, high speed flow over closed cavities becomes unstable, leading to large flow flucuations inside and around the cavities. This phenomenon is simulated for a 1.5-inch deep by three-inch long cavity using a water table. Upstream blowing is used in an attempt to supress the oscillations.

Steady blowing produced total attenuation. Pulsed blowing produces similar attenuation for a few cycles, and then excited the oscillations to higher amplitude.