Multiple Marching Direction Approach to Generate High Quality Hybrid Meshes

This paper describes the method to generate hybrid meshes composed of triangular prisms, pyramids, hexahedra, and tetrahedra for viscous computational fluid dynamics simulations. Surface triangulation is performed using a direct advancing front method or a modified mesh-decimation method. From a surface mesh, a near-field mesh is generated using an advancing layer approach. To generate high-quality meshes and to mesh around singular points, multiple marching directions are prepared from nodes on sharp convex corners. Special placement of elements around the sharp convex corners avoids using generalized elements. Tetrahedral meshing is then performed to fill the rest of the domain using an advancing front method. The hybrid mesh generation method is applied to several models to demonstrate its capability.