Convergence acceleration of viscous and inviscid hypersonic flow calculationsThe convergence of inviscid and viscous hypersonic flow calculations using a two-dimensional flux-splitting code is accelerated by applying a Richardson-type overrelaxation method. Successful results are presented for various cases; and a 50 percent savings in computer time is usually achieved. An analytical formula for the overrelaxation factor is derived, and the performance of this scheme is confirmed numerically. Moreover, application of this overrelaxation scheme produces a favorable preconditioning for Wynn's epsilon-algorithm. Both techniques have been extended to viscous three-dimensional flows and applied to accelerate the convergence of the compressible Navier-Stokes code. A savings of 40 percent in computer time is achieved in this case.
Document ID
19890054729
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cheer, A. (California Univ. Davis, CA, United States)
Hafez, M. (California, University Davis, United States)
Cheung, S. (California Univ. Davis, CA, United States)
Flores, J. (NASA Ames Research Center Moffett Field, CA, United States)