Overview

In Chapter 6, the SPH method is applied to simulate the complicated explosion process arising from high explosive (HE) detonation. In this chapter, the SPH method is extended to simulate the shock waves generated by underwater explosions.

The formulation of the SPH method used in this chapter is largely the same as those in Chapter 6. The major challenge in this chapter is the presence of multi-materials in the problem domain, which requires special treatments. In order to suit the needs of underwater explosion shock simulation, a particle-to-particle interface technique is employed. The interface treatment technique allows the SPH (kernel and particle) approximations among particles form different materials. A special penalty force is applied in the interface treatment technique on the possible penetrating particles. Numerical examples reveal that the SPH method, after properly tuned, can resolve the underwater explosion shocks fairly well.

The SPH method is also used to investigate the real and the artificial detonation models of high explosive as well as their influences to the entire simulation of underwater explosion shock. It is found that beyond the region of 8 10 times the charge radius, both detonation models can get fairly good and close results. In region less than 8 10 times the charge radius, the real detonation model should be employed to obtain more accurate results.

This chapter studies also the water mitigation problems using the SPH method. The water mitigation study using the SPH method is very important in designing high-performance magazines that are robust against...