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Aeroacoustic Resonance in a Deep Cavity with Grazing Flow
  1. The resonant oscillation occurring in a cavity with grazing flow can produce sound with peaks at discrete frequencies.

  2. The oscillation can be categorized as fluid-dynamic and fluid-resonant.

  3. 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.

  4. The fluid-resonant oscillation is due to the Helmholtz resonance phenomenon.

  5. A deep cavity can have both types of the oscillations.

Velocity Field in One Resonance Cycle

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