针对流体大变形问题网格邻域可变技术

Reconnection-based Lagrangian-local Remeshing Method for Large Deformations

结合大量实际问题,研究基于邻域可变的拉氏局部重分新方法,允许网格邻域在计算中局部跟随流体可变,虽然可能会导致任意多边形网格,但比标准的拉氏+重分方法有更好的拉氏特点.网格邻域可变的局部重分策略是基于计算过程中处理网格相交的思想,即在网格相交处改变网格邻域关系,使网格不会出现相交,保持计算正常进行.通过几个数值例子论证方法的特点,并与标准的拉氏+重分方法进行比较,显示其优点.

We present a reconection-based Lagrangian＋rezone（LR） method,in which connectivity of meshes can be changed in a rezone phase in order to handle geometric intersection.The method maintains more Lagrangian features of meshes than standard LR methods.Numerical examples demonstrate that the method is more robust for large defomations.It shows predictive capabilities of reconnection-based LR method.