3D Agglomeration Multigrid Solver for the Reynolds-Averaged Navier-StokesEquations on Unstructured Meshes

摘要

An agglomeration multigrid strategy is developed and implemented for the solutionof three-dimensional steady viscous flows. The method enables convergence acceleration with minimal additional memory overheads, and is completely automated, in that it can deal with grids of arbitrary construction. The multigrid technique is validated by comparing the delivered convergence rates with those obtained by a previously developed overset-mesh multigrid approach, and by demonstrating grid independent convergence rates for aerodynamic problems on very large grids. Prospects for further increases in multigrid efficiency for high-Reynolds number viscous flows on highly stretched meshes are discussed.