Anisotropic unstructured grid generation for 3D flow simulation problems

Numerical Grid Generation in Computational Field Simulations, Ed. M. Cross., B. K. Soni, J. F. Thompson, J. Hauser, P. R. Eiseman, Proceedings of the 6th International Conference, held at the University of Greenwich, pp.487-496, July 1998

MESHING
RESEARCH
CORNER

Boeing Operations International Inc., Moscow
Central Aerohydrodynamics Institute
Moscow reg., Zhukovsky, Russian Federation

Abstract
This paper describes the approach to the generation of anisotropic unstructured grids aligned with the directionality of the flow and geometry in 3D space. The grid composed of highly stretched tetrahedra produced by tessellation of prismatic grid generated in viscous dominated flow regions and tetrahedra produced by advancing front method in the outer part of the domain. This approach offers substantial savings in the grid size required for flow simulation problem, because isotropic volume grids may comprise excessive number on nodes. The directionality incorporated in advancing front and surface grid generation made it possible to obtain a smooth matching between boundary layer and outer parts of the NavierStokes grids. The Euler calculations performed on the grids around some types of geometries proved the viability of developed grid generation methods.