Comparison study of implicit gauss-seidel line iteration method for transonic flows

Yiqing Shen, Baoyuan Wang, Gecheng Zha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

This paper studies the sweep direction effect on the convergence rate and CPU time of the implicit unfactored Gauss-Seidel line relaxation (GSLR) method for compressible flows. The line Gauss-Seidel iteration is also compared with the LU-SGS (lower-upper symmetric Gauss-Seidel) method. A modified LU-SGS method, namely LU-GSLR, is studied. The LU-GSLR use the unfactored GSLR method with the simple matrix of the LU-SGS. The numerical experiments indicate that for the external flows, the line Gauss-Seidel relaxation methods with sweeping in all directions achieves the optimum convergence rate and CPU efficiency. For an inviscid transonic internal flow, the best convergence rate is obtained with sweeping in streamwise direction only. Within each time step, one sweep (a forward sweep plus a backward sweep) per time step is sufficient. For the three implicit methods, GSLR, LU-SGS, and LU-GSLR, the GSLR is the most efficient method when the Roe scheme is used. The LU-GSLR method is a feasible method and can achieve better efficiency than the LU-SGS for some cases.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 18th AIAA Computational Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages1580-1593
Number of pages14
ISBN (Print)1563478994, 9781563478994
DOIs
StatePublished - 2007
Event18th AIAA Computational Fluid Dynamics Conference - Miami, FL, United States
Duration: Jun 25 2007Jun 28 2007

Publication series

NameCollection of Technical Papers - 18th AIAA Computational Fluid Dynamics Conference
Volume2

Other

Other18th AIAA Computational Fluid Dynamics Conference
CountryUnited States
CityMiami, FL
Period6/25/076/28/07

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Automotive Engineering

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