计算液体晃动ALE网格速度的高精度方法

A HIGH PRECISION METHOD TO COMPUTE THE ALE GRID VELOCITY IN LIQUID SLOSHING SIMULATION

利用自由液面曲率参量,在传统求解方法基础上对相应结点网格速度引入修正,以提高计算精度．域内网格速度计算,由传统线性关系改用分段函数表达,以保证网格剖分的质量．将二维矩形贮箱内流体晃动问题作为算例,求解激励响应结果并与已有物理实验进行对比,二者符合较好．

The computational precision is important for ALE description in liquid sloshing simulation to calculate the grid velocity. On the free surface, the grid velocity is corrected by using the curvature there to improve its description precision. Piecewise smooth functions are used to calculate the grid velocity inside, they are better than a linear relationship applied before for the subdivision of the high quality grid. A 2D problem excited in a rectangular tank is computed and results are compared with experiment, as in the reference. The advantage of using high precision grid velocity is obvious.