Study on bubble collapse near a solid wall under different hypergravity environments

Abstract

Bubble has significant applications in ocean engineering. Aiming at the difficulty of conducting the underwater explosion bubble experiment with large charge in deep water, this paper adopts a new way to deal with this problem. On the basis of similarity theory, it is found that by considering the scaling relationship of gravitational acceleration, the explosion bubble with small charge in shallow water can satisfy the similar relationship with the explosion bubble with large charge in deep water. Therefore, the dynamic characteristics of the explosion bubble with large charge in deep water can be realized by changing the gravitational acceleration. With the assumption that the liquid is inviscid and incompressible, the bubble dynamics are solved by the Euler equations with the finite volume method, and the motion of the bubble interface is tracked by the front tracking method. Based on this model, the bubble collapse characteristics near a solid wall under different hypergravity environments are studied systematically. The results show that the bubble motion, the formation position of the bubble jet, the liquid jet velocity, and the pressure induced by the bubble will change significantly under different hypergravity environments.