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Aeroacoustis
Aeroacoustic Resonance in a Deep Cavity with Grazing Flow
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The resonant oscillation occurring in a cavity with grazing flow can produce sound with peaks at discrete frequencies.
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The oscillation can be categorized as fluid-dynamic and fluid-resonant.
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The fluid-dynamic oscillation is sustained by a feed-back loop consistent with the vortex in the shear layer and pressure waves from the downstream edge of the cavity.
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The fluid-resonant oscillation is due to the Helmholtz resonance phenomenon.
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A deep cavity can have both types of the oscillations.
Velocity Field in One Resonance Cycle
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