Anisotropic Mesh Adaptation Through Edge Primitive Operations
Todd R. Michal, Joshua Ambre Krakos · 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition · 2012
The development of a modular library for anisotropic adaptation of tetrahedral unstructured meshes is presented. The adaptive method relies on repeated application of simple edge break and collapse operations to modify a mesh such that individual edge lengths match a given anisotropic metric tensor field. The procedure maintains a continuous metric distribution through consistent interpolation of the initial metric field. Several methods are integrated within the library to preprocess the initial metric field so as to limit minimum and maximum local mesh sizes, control stretching rates of mesh size and/or anisotropy, and ensure smoothness of the resulting metric distribution. In addition, procedures to limit the metric distribution relative to the initial mesh and/or to the local geometry surface curvature are presented. Finally a linear-elastic mesh deformation method coupled with application provided geometric call-back functions is used to deform the adapted mesh to the geometry surface. The modular library implementation simplifies integration of the adaptive capability with new flow solver and mesh generation packages. Examples from multiple flow solvers and a mesh manipulation tool are presented.