Acoustic-gravity waves induced by vortices horizontally moving underwater
In this article,the governing equation of acoustic gravity waves is derived.Based on the governing equation,acoustic-gravity waves induced by a cylinder horizontally moving under water are investigated.Strong anisotropy phenomena are observed from the frequency spectra of the acoustic-gravity waves.According to the results,a set of line spectra,which are approximately two sets of continuous spectra,can be observed in the spectrum of the acoustic-gravity wave.A semi-analytic solution for the acoustic-gravity wave generated by the moving vortex pair in two-dimensional space is obtained with Green's function to analyze the characteristic frequencies of the spectrum.The far-field solution of acoustic-gravity waves in three-dimensional space is asymptotically analyzed to explain phenomena observed from the frequency spectra.
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