Scattering of hydrodynamic pressure pulses by coating inhomogeneities

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Abstract
Sound generation by a deterministic, hydrodynamic pressure pulse in a fluid flowing over a compliant coating with an embedded void inhomogeneity is investigated. The inhomogeneity is represented by an acoustic monopole and its strength is found for several models of the pressure pulse. The far-field acoustic pressure is calculated for all models and is compared with the sound generated by a statistically stationary turbulent boundary layer. It is found that for certain parameters of the coating, the intensity of scattered sound generated by a deterministic pulse may exceed by 10–40 dB the intensity of sound estimated for the statistical turbulent boundary layer forcing.

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