基于新型轴对称无网格方法的水下爆炸冲击波和气泡运动数值模拟

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

摘要:

采用无网格光滑粒子流体动力学（smooth particle hydrodynamics， SPH）方法，结合粒子体积自适应技术（volume adaptive scheme， VAS）构建高精度、高效率的新型轴对称SPH模型，实现水下爆炸冲击波和气泡运动模拟。在冲击波传播阶段，通过与经验公式及文献理论值对比，验证了该轴对称SPH模型的精度。针对气泡脉动模拟，选取典型的双气泡耦合问题，分析气泡形态和压力载荷的力学特性，讨论了两气泡之间的距离参数对气泡相互作用过程的影响。结果表明，该新型轴对称SPH模型可实现水下爆炸过程压力载荷和气泡形态演化的精确预报。

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.