Spectral analysis of the pressure generation of travelling bubbles in a two-dimensional compressible flow

The collapsing characteristics of cavitation-bubble clusters in a two-dimensional compressible flow are studied. The theory of random process is adopted to analyze the spectral property of the pressure generated by the bubbles. Analytical results show that the power spectrum of travelling-bubble-cluster induced pressure stays constant in a large frequency range. Unlike the type of oscillating sheet cavitation, no energy concentration phenomenon will exist in a narrow frequency range, so that there will be less possibility to induce structure vibration than that resulting from the former.