用于ALE有限元模拟的网格更新方法

MESH UPDATE ALGORITHM IN ALE FINITE METHOD WITHIN FREE SURFACE FLOW

任意拉格朗日欧拉法(ALE)可以通过定义参考网格的运动,实现自由液面跟踪,完成液体晃动的数值计算.综合用于更新网格节点的3种基本计算方法,将多方向更新网格速度的技术应用于任意拉格朗日欧拉网格节点的速度计算.给出了水平圆柱形贮箱和椭圆形贮箱内液体晃动算例,实现了多方向更新网格运动与晃动流场计算的耦合,使ALE方法能胜任复杂几何边界下的自由液面流动的数值模拟.

The arbitrary Lagrange-Euler method affords tracking the motion of free interface in liquid slosh problems through defining the nodal velocities of reference frame. Based on reviewing the three elementary algorithms applied in mesh updating, the method that computational nodes can move more than one direction is used in special numerical example. This achievement demonstrates that the ALE method is available for more complex geometrical boundaries. The nodal velocities and mesh configurations during the sloshing in horizontal cylinder are illustrated at the section of nuemerical example.