Study on underwater explosion shock characteristic of rudder based on ale method

Arbitrary Lagrangian-Eulerian (ALE) Finite Element Method is used to solve the fluid-structure interaction problem in the explosion shock. The fluid and explosive models are described by ALE algorithm, the structure model of rudder is represented in Lagrangain method. And also penalty function coupling algorithm is applied to the interface between different medium. The simulation of the whole process of ship rudder suffering from the shock of TNT explosion is accomplished by finite element software ANSYS/LS-DYNA. The shock response, including stress and displacement nephogram of rudder, pressure-time process curve in the typical position, and acceleration-time curve etc. is presented. The results show that using ALE finite element method can estimate the damage situation of rudder in underwater explosion impact load, which provide references for the anti-shock design of rudder.