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On the vorticity-generated sound for moving surfaces. (English) Zbl 1024.76048

Authors’ summary: A formulation for analyzing the mechanism of vorticity-generated sound is presented, which is based upon an extension of a boundary integral equation method for unsteady quasi-potential compressible flows. The extension is obtained through an exact decomposition of velocity field into potential and rotational contributions, with the distinguishing feature that the vortical contribution vanishes in much of the field. The novelty is that the construction of vortical contribution of the velocity is such that discontinuities across the wake of the two (potential and rotational) contributions are eliminated, thereby facilitating possible implementations.

MSC:

76Q05 Hydro- and aero-acoustics
76M15 Boundary element methods applied to problems in fluid mechanics
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