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The decomposition of hydrodynamic and acoustic components of cavity flows canaid the understanding of the flow-acoustic interaction, which produces avariety of adverse effects in applications. We apply the approach of combiningthe resolvent analysis and Doak's momentum potential theory to examine theinput-output flow-acoustic characteristics of compressible flow over an opencavity at Re=10,000. The methodology can decompose hydrodynamic and acousticcomponents from an input-output framework. We further localize the forcing atthe leading-edge and front wall of the cavity and filter with a singlecomponent of velocity, density, and temperature forcing. For the subsonic flowat M=0.6, The strong acoustic component appears at the trailing edge of thecavity at a lower frequency. while as the frequency increases, the intenseacoustic structure moves close to upstream and overlap with the hydrodynamiccomponent. This tendency is also observed in the supersonic flow conditionM=1.4. Compared to different types of forcing, the streamwise velocity forcingachieves the largest energy amplification. However, it substantially reduces bymoving the forcing location from the leading-edge to the front wall of thecavity. This work provides an alternative approach to examine input-outputflow-acoustic characteristics where resonance is dominant and provides guidancefor the development of flow control strategies.

Acoustic response of turbulent cavity flow using resolvent analysis