基于非结构任意多边形网格的滑移面计算技术

Computational technique of sliding surface based on general unstructured polygonal mesh

基于任意多边形网格管理体系,针对流体多介质问题的数值模拟,发展了拉氏方法滑移面计算技术.文章给出了滑移线设置的数据结构,滑移线上主从点速度与位置的计算格式,及节点滑移后引起界面上点、相关网格邻域关系变化的算法。该滑移计算技术避免了传统算法中由于以模拟法(重叠或分离网格)代替直接法(拼接网格)而造成几何守恒律被破坏的缺陷.数值例子验证了该算法的可行性,体现了算法无缝连接的特点.

Based n-polygon grid management system developed the Lagrange method sliding surface computing technology for the numerical simulation of fluid multi-media issues.This technique defines the data structure of sliding surface firstly,and then gives the method to get the velocity and position of the master nodes and the slave nodes lying along the interface.This technique changes the connectivity of the mesh based the interface nodes' position,so that it can describe the shape of moving sliding surface.Our technique overcomes the trouble of traditional method to handle the deformable mesh using the straight line not the curve to solve the contact-impact point.The numerical simulation results confirm the efficient of our technique;also present the characteristic of no void connectivity.