近壁面水下爆炸气泡运动的数值计算研究

Dynamic behavior of a bubble near a rigid wall in underwater explosion

基于MSC.DYTRAN非线性有限元软件建立炸药爆轰与冲击波传播的一维有限元模型,通过与冲击波压力峰值经验公式对比,验证模型的正确性。将一维数值计算结果映射到三维流场中以确定气泡运动的初始条件,开发定义流场初始条件与边界条件的子程序,对近刚性壁面气泡运动过程进行仿真分析,通过与实验结果的对比,验证三维数值计算模型的正确性。以此为基础,研究刚性面角度以及距离参数对气泡运动、射流角度、速度的影响规律,计算模型、方法及结果对相关的工程研究和计算具有一定参考价值。

One-dimensional FE model for explosive detonation and propagation of shock wave was established and the simulation was done based on MSC. DYTRAN software. The computational results of the peak pressures of shock wave were compared with the test ones. The agreement between them verified the correctness of the FE model. The initial conditions of a three-dimensional bubble were determined by mapping the computational results of the one-dimensional model into a 3D fluid field. Subroutines to define the initial conditions and boundary conditions of the fluid field were developed. The dynamic behavior of a bubble near a rigid wall was simulated and analyzed. The interactions between the bubble and the rigid wall were studied systematically. It was shown that the dynamic behavior of the bubble is closely related to distance parameters and the angle of the rigid wall surface. The study provided a reference for the related studies and engineering calculation.