离心泵叶轮三维贴体网格生成

3 D Body fitted Grid Generation of Centrifugal Pump Impellers

采用椭圆型微分方程法进行离心泵叶轮三维贴体网格的自动生成 ,可以满足网格非均匀性和网格大小可人为改变等条件。在生成网格时给定边界上的点与第一内点的距离以及两者连线与壁面曲线间夹角的边界条件 ,能使在湍流计算中广泛应用的壁面函数法的条件容易满足 ,并能使普遍采用的压力第二边界条件直接用于计算中 ,还能满足差分要求 。

The grid generation method of the elliptic partial differential equations is used to automatically generate the 3 D body fitted grids of the centrifugal pump impellers which can ensure the variability of the uniformity and the size. In the generating process, as the boundary conditions, the distance between the point on the boundary and its corresponding first internal point and the angle between the linked line of two points and the wall curve were given which can make the grid easily satisfy the wall function and the widely applied second pressure boundary condition when it is used in the turbulent flow calculation. It can also satisfy the differencing demand and minimize the discretization error.