A08 Numerical investigation of ultrasonic cavitation bubble oscillations through 3D compressible simulation

Abstract

The ultrasonic cavitating bubble oscillations were numerically investigated through full 3D computational fluid dynamics. The bubble compression was numerically expressed by the compressible fluid dynamics. The Volume of Fluid (VOF) method was adopted for the bubble-liquid multiphase flow. The frequency of pressure oscillation is 20 kHz, and the oscillation amplitudes of pressure wave are 0.5 and 0.9 atm., respectively.
The numerical results show that the bubble oscillates almost linearly at the 0.5 atm. amplitude. However, the oscillations of bubble become non-linear at the 0.9 atm. amplitude. The calculated results correspond well to the results obtained by using the Keller and Rayleigh-Plesset equations.