A numerical and experimental investigation into the effects of cavity geometry on the production of cavity tones

The effect of the leading and trailing edge geometries on the production of tones associated with the flow of low‐speed subsonic air over a cavity were investigated experimentally and numerically. The leading edge geometries considered in the study included an overhang (simulating car door gaps) and an overhang with delta tabs such as used to control jet noise. The trailing edge geometries used in the investigations included sloped and rounded impingement regions. The numerical results documented the periodic fluctuations of the transverse velocity, pressure, and density of the shear layer and the resulting cavity pressures. The periodic vortex behavior in the cavity mouth and impingement region was also studied numerically to predict possible configurations for sound suppression. Experimental investigations of the cavity sound‐pressure levels were used to determine the validity of the numerical simulations and the predicted cavity configurations for sound suppression.