交贯隧道边界元数值模拟中的网格剖分方法

分别分析了三维情况下隧道表面结构化和非结构化网格的生成原理.主要通过对隧道表面进行分块,采用映射方法先在平面内进行非结构化三角网格剖分,然后依据断面的拟合插值函数投影到几何体表面,形成隧道表面的非结构化三角网格剖分.在交贯隧道边界元数值模拟计算中实现了交贯隧道表面网格中交贯点的快速追踪查找,解决了交贯隧道表面交贯处的网格剖分衔接问题,并且通过在VB环境下的OpenGL编程,实现了网格剖分的可视化,并得到了符合边界元计算所需的网格单元节点数据.

Mesh Generation Principles for Intersecting Tunnels Numerical Simulation by Boundary Element Method

Structured and unstructured mesh generation principles were analyzed in 3D tunnel surface region.3D complicated surface regions were split into several parts,and then 2D unstructured triangle mesh generation was done by using mapping method and the 2D mesh was mapped onto 3D surface region according to interpolating function of cross-section fitting,so unstructured triangle mesh of 3D surface region was generated.Nodes on the intersecting lines of intersecting tunnels are traced and found fast in intersecting tunnels numerical simulation through boundary element method,which effectively solve the mesh close problem near the intersecting line.Moreover,visualization of mesh generation is realized on the basis of Visual Basic and OpenGL visualization figure platform.