Generation of viscous grids with ridges and corners

摘要

An extension of Lohner1 for the generation of high aspect ratio volume grids on surfaces with ridges and corners is presented for Reynolds-Averaged Navier-Stokes computations (RANS). Multiple normals are introduced along convex ridges. The original technique generates a semi-structured boundary layer of prismatic elements growing along point normals. Therefore, extra faces of null area must be introduced to take into account the multiple growth curves at convex ridges and produce a valid topological surface triangu-lation. The procedure relies on a topological taxonomy of an arbitrary combination of concave and convex ridges. Each case is highlighted in details. Several complex geometries have been chosen to illustrate the proposed procedure and timings are given, showing that the new module does not place any extra burden in the previous semi-structured approach.