Generation of non-isotropic unstructured grids via directional enrichment

A procedure for the generation of highly stretched grids suitable for Reyno lds-averaged Navier-Stokes (RANS) calculations is presented. In a first sta ge, an isotropic (Euler) mesh is generated. In a second stage, this grid is successively enriched with points in order to achieve highly stretched ele ments. The element reconnection is carried out using a constrained Delaunay approach. Points are introduced from the regions of lowest stretching towa rds the regions of highest stretching. The procedure has the advantages of not requiring any type of surface recovery, not requiring extra passes or w ork to mesh concave ridges/corners, and guarantees a final mesh, an essenti al requirement for industrial environments. Given that point placement and element quality are highly dependent for the Delaunay procedure, special pr ocedures were developed in order to obtain optimal point placement. Copyrig ht (C) 2000 John Wiley & Sons, Ltd.