基于边界元法的二维结构物出水的数值模拟

基于边界元方法对二维结构物出水进行数值模拟，分析该过程的水动力问题.模型假定流体不可压缩，并忽略黏性；结构物为刚体，以恒定速度垂直出水.基于拉格朗日网格追踪每一点的运动和速度势的变化，计算出水过程中的非线性自由液面.结果表明，在临近自由表面时，结构物上方的自由液面形成一个隆起区；同时，结构物受到垂直向下的水动压力明显增大.
Based on the boundary element method (BEM), the waterexit problem of 2D body was simulated to analyze the hydrodynamic force phenomenon. It was assumed that the fluid was incompressible and inviscid, the structure was rigid and waterexit vertically at constant speed. Lagrange grid was adopted to track the motion of every node and the change of velocity potential, the nonlinear free surface during the process of waterexit was calculated. Results show that when a body approaches the free surface, the upper free surface will generate upwelling area, and the hydrodynamic pressure down into the water encountered by the structure will increase significantly.