射流预测法与近壁三维爆炸气泡计算

Jet Prediction Method for the Simulation of 3D Explosion Bubble

针对近板壁三维爆炸气泡的计算 ,运用射流预测法和局部曲面拟合来改善泡面单元形态 ,解决了由于网格变形而引起的计算不收敛问题 .运用边界单元法来求解流场 .通过算例 ,给出气泡迁移、射流等重要动力学行为 。

The behavior of a bubble near a rigid plate is considered by the local surface fitting and the 'jet prediction' method. The convergence problem caused by the abnormality of the elements can be solved. The flow is attained by using the boundary integral equation method on the assumption that the water is inviscid and incompressible, and the bubble gas obeys the isoentropic rule. The evolution of the bubble is simulated by means of the mixed Euler Lagrange method, and the Runge Kutta method. The important behaviors of the bubble, such as migration and jetting, are derived from the sample. The solution of one period of the explosion bubble can be obtained.