A domain decomposition study of massively parallel computing in compressible gas dynamics

摘要

The appropriate utilization of massively parallel computers for solving the Navier-Stokes equatios is investigated and determined from an engineering persoective. The issues investigated ARe: (1) Should strip or patch domain decomposition of the spatial mesh be used to reduce computer time? 92) How many computer nodes should be used for a proboem with a given sized meash to reduce computer time? (3) Is the convergence of the Navier-Stokes solution procedure (LU-SGS) adversely influenced by the domain decomposition ap;proach? The results of the paper show that the present Navier-Stokes solution technique has good performance on a massively parallel computer for transient flow problems. For steady-state problems with a large number of mesh cells, the solution procedure will require significant computer time due to an increased number of iterations to achieve a converged solution. The optimum number of computer nodes to use for a problem with a given global mesh size is investigated.