Numerical Simulation Study of Pulsation Dynamics of Underwater Explosion Bubble Located under Elastoplastic Plane

The study on interaction of elastoplastic structure and underwater explosion bubble is an important topic. The dynamics of bubble, located under a horizontal elastic-plastic plane, was studied by MSC. Dytran program, and fluid-structure interaction was analyzed also. The dimensionless parameter n is introduced, which equals to the stand-off distance/the maximum bubble radius. The parameters of bubble, such as radius and period, with different variable n , are compared with those without boundary condition, and it is found out that an oscillating bubble located under elastic-plastic plane can be considered a perfect sphere when variable n ≥ 2. It is obtained that a cavitation zone like a taper appears between plane and bubble, followed by a powerful jet impacting on elastic-plastic plane, which is observed by underwater explosion experiment.