Automatic generation of unstructured grids with Delaunay triangulation andits application

This paper is consisted of two parts. In the first part, a method is descri bed which generates two-dimensional triangle mesh using the Delaunay triang ulation criterion. An automatic algorithm was proposed which combines sever al advantages of the existing methods. Local mesh refinement can also be ea sily performed with this method. Examples of generated grids were presented for several convex, non-convex and multi-connected domains to demonstrate the effectiveness and feasibility of the proposed method. In the second par t, the turbulent heat transfer in an annular space finned by wave-like long itudinal fins was numerical simulated. The proposed technique was adopted t o generate the grid in the cross-section. The standard K-epsilon model in c onjuction with wall function method was used to simulate the fluid flow and heat transfer in the complex geometry. The discretization of the governing equations was described. The computational results were compared with the authors' test data and the agreement was reasonably good.