Unstructured Viscous Grid Generation by Advancing-Layers Method

AIAA-93-3453-CP, AIAA, pp.420-434, 1993

MESHING
RESEARCH
CORNER

VIGYAN, Inc. Hampton, Virginia

Abstract
A new method of generating unstructured triangular/tetrahedral grids with high-aspect-ratio cells is proposed. The method is based on a new grid- marching strategy referred to as 'advancing-layers' for construction of highly stretched cells in the boundary layer and the conventional advancing-front technique for generation of regular, equilateral cells in the inviscid-flow region. Unlike the existing semi-structured viscous grid generation techniques, the new procedure relies on a totally unstructured advancing-front grid strategy resulting in a substantially enhanced grid flexibility and efficiency. The method is conceptually simple but powerful, capable of producing high quality viscous grids for complex configurations with ease. A number of two-dimensional, triangular grids are presented to demonstrate the methodology. The basic elements of the method, however, have been primarily designed with three- dimensional problems in mind, making it extendible for tetrahedral, viscous grid generation.