A computational study has been conducted to evaluate a passive control technique of suppressing intense pressure oscillations in a cavity with supersonic free stream flow. A porous surface with a sub-cavity fitted at the leading edge wall of an open square cavity at Mach number 1.83 at the cavity entrance was investigated for that purpose. The introduction of these control devices helped to alter the oscillating shear layer in a favorable way so that some of the undesirable effects resulting from supersonic cavity flows were eliminated. The results also showed that the resultant amount of attenuation of pressure oscillations was dependent on the porosity, the size of perforation of the porous surface, and on the sub-cavity.
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