Development of Automatic Tetrahedral-Mesh Generation Technique for Large-Scale Computational Fluid Dynamics

This paper describes a high-speed, automatic, tetrahedral-generation technique for large-scale computational fluid dynamics that is based on Delaunay method. The system first generates triangles on surfaces of a geometry model. Next, it divides the model into coarse elements (tetrahedrals) using nodes of surface triangles. Then it iterates the next three processes : (1) set a goal volume for each element using the area of surface triangle, (2) put a new node into the element if the volume of a target element is larger than the goal volume, and (3) divide elements using the Delaunay method. In addition, this system controls the density of inside elements which exist from the surface to the inside of the geometry model, using depth parameters. In such a manner, a tetrahedral-mesh with appropriate for computational fluid dynamics can be generated quickly.