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Output Based Grid Adaptation for Viscous Flow

The paper addresses the problem of the 3D meshing of the complex free form Boundary Representation geometry with multiple domains. It introduces a generic graph based method of the CAD model analyses with optimal boundary recovery. A three stage approach is used: firstly, an underlying geometry is repaired to provide a conformal model without gaps and overlaps. Secondly, the model is analyzed and a special topological graph is introduced. Finally, an unstructured 3D Delaunay mesh is generated using the properties of the spanning tree of the domain graph to provide an optimal boundary recovery during meshing with a minimal number of inserted nodes. The properties of the domain graph are discussed in the context of unstructured mesh generation. The paper provides examples, showing efficiency of the method for optimal meshing of complex Geological Geometry.