Numerical Simulation of Underwater Explosion Shock Waves and Bubbles Based on a Novel Axisymmetric Meshless Method

Abstract:

The smooth particle hydrodynamics method is used to construct an accurate and efficient axisymmetric smooth particle hydrodynamics （SPH） model in combination with the volume adaptive scheme （VAS） to realize the simulation of the process of underwater explosion including shock wave propagation and bubble pulsation. First， the phase of shock wave propagation is simulated to verify the accuracy of the axisymmetric SPH model by comparing with the empirical formula and theoretical value. Then， a typical double-bubble coupling problem in the bubble action phase is selected to analyze the bubble evolution and pressure-load dynamic characteristics. Finally， the influence of the distance parameter between two bubbles on the bubble interaction process is further discussed. The results imply that the axisymmetric SPH model in this paper is of high accuracy and can achieve detailed bubble capture and pressure load prediction for the underwater explosion process.

Key words:underwater explosion;axisymmetric smooth particle hydrodynamics （SPH） model;shock wave;double-bubble coupling