Numerical Solution on Spherical Vacuum Bubble Collapse Using MPS Method

Abstract

In this study, the vacuum bubble collapse in liquid pool has been simulated using MPS code. The liquid is described using moving particles and the bubble-liquid interface was set to be vacuum pressure boundary without interfacial heat mass transfer. The motion and location of interfacial particles can be competent in configurating the topological shape of vacuum bubble. The time dependent bubble diameter, interfacial velocity and bubble collapse time were obtained under wide parametric range. The comparison with Rayleigh’s prediction showed a good agreement which validates the applicability and accuracy on MPS method in solving present momentum problems. The potential void-induced water hammer pressure pulse was also evaluated which is instructive for cavitaion erosion study. The bubble collapse with noncondensable gas has also been simulated and the rebound phenomenon was successfully captured which is similar with vapor-filled cavitation phenomenon. The present study exhibits some fundamental characteristics of vacuum bubble hydrodynamics and it is also expected to be instructive for further applications of MPS method to in complicated bubble dynamics.