In this paper, we present a generalized prismatic hybrid meshing method for viscous flow simulations.
One major difficulty in implementing a robust prismatic hybrid meshing tool is to handle boundary
layer mesh collisions and normally an extra data structure (e.g. quadtree in 2D and octree in 3D) is
required. The proposed method overcomes this difficulty via an heuristic approach and it only relies
on Constrained Delaunay Triangulation/Tetrahedralization(CDT). No extra data structures are required.
Geometrical reasoning is used to approximate the maximum marching distance of each point by walking
through the CDT. This is combined with post-processing of marching vectors and distance and prohibition of
multilevel differences to form an automatic and robust mechanism to remove boundary layer mesh collisions.
Benefiting from the matureness of CDT techniques, the proposed method is robust, efficient and simple
to implement. Its capability is demonstrated by generating quality prismatic hybrid meshes for industrial
models with complex geometries. The proposed method is believed to be able considerably reduce the effort
to implement a robust hybrid prismatic mesh generator for viscous flow simulations.