3D Anisotropic Delaunay Meshing for Ideal Interfacing to Block-Unstructured Mixed Meshes Using a Sparse Octree for Metric Size Propagation

Kurzfassung

Generating smooth mixed block-unstructured meshes is a promising way to reduce mesh sizes for outer aerodynamic flow analysis. Beyond the core part of the mesh generation, the smooth meshing of the boundary layer region by structured hexahedrons and prisms, for the remaining flow field a triangulation method is needed that allows for a smooth transition between the different element types. This paper outlines the details of the final brick of the mixed meshing method, an anisotropic triangulation method to generate bounding element conforming tetrahedral meshes. A special emphasis is put on a new sparse octree method for memory and time efficient propagation of the underlying propagation of the anisotropic met-ric information in the mesh domain. The contribution presents modifications to a Delaunay-type meshing kernel together with a special sparse octree structure for memory efficient propagation of anisotropic size information. The benefits of the method are outlined for two common aerodynamic configurations, the ONERA M6 wing and the Boeing CRM configura-tion, known from the 4th AIAA drag prediction workshop.