Abstract:

Extremely fine meshes are required to resolve the flow in the thin shear layer regions present in high Reynolds number turbulent flows. In addition, such fine spacings normal to the body surfaces result in very high aspect ratio cells in the shear layers, which generally degrades the efficiency of the multigrid scheme. Details of the acceleration techniques, which are important for convergence on meshes with such high aspect ration cells, are discussed. The multigrid technique developed here is shown to result in a significant reduction in computer time to achieve converged solutions, as compared to the basic diagonalized Beam Warming schemes.

Key words: computational gr ids, Navier-Stokes equation, computat ional fluid dynamics