Generalized Grid Techniques in Computational Field Simulation

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.521-531, July 1998

MESHING
RESEARCH
CORNER

Engineering Research Center for Computational Field Simulation
Mississippi State University, MS 39762.

Abstract
A generalized grid/flow-simulation system which combines the advantages of both structured and unstructured grid is presented. Structured grids are kept within the boundary layer region, which are generated using an advancing layer type approach. A local elliptic solver is applied to avoid the grid crossing near the concave regions. Unstructured grids are generated away from the body using Delaunay triangulation. The grid information for the generalized grid is stored using an edge/cell-face based data structure. A cell centered upwind finite volume scheme is used to solve the integral form of the Navier-Stokes equations. The convective fluxes are calculated using the flux difference split scheme due to Roe. Spalart-Allmaras one equation turbulence model is implemented for the generalized grids. The effect of limiter functions and flux Jacobians on convergence to steady state solutions is investigated. Numerical results that are of practical importance are presented.