Numerical Analysis of Interaction between Single Bubble and Shock Wave.

Abstract

The Arbitrary Lagrangian-Eulerian (ALE) method is used to predict the collapse and rebound of a bubble in a compressible viscous liquid by taking account of the flow inside the bubble. Computations are performed for the interaction between a gas bubble and an incident shock wave. It is shown that when the incident shock wave is strong, the deformation of the bubble surface occurs in the early stage of collapse. When the pressure behind the incident shock wave, p0, is 101.3 MPa, an internal shock wave arises, thus considerably increasing the local temperature inside the bubble. 0n the other hand, when p0 is less than about 1.013 MPa, the liquid pressure increases almost uniformly after the incident shock wave passes through the bubble, and therefore, the state of the gas inside the bubble can be regarded as nearly uniform. It is also shown that although the velocity of the microjet becomes faster with the increase of p0, the increasing rate of jetvelocity is suppressed when the jetvelocity approaches to the velocity of sound in the liquid.