Performance comparisons of parallel implicit solvers for hypersonic flow computations on unstructured meshes

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

5 Scopus citations

Abstract

A comparative study of time integration methods for the Navier-Stokes equations with chemistry is presented. A hybrid line-relaxation and point-relaxation implicit method is compared with a fully-coupled time integration method. The fully-coupled method makes use of the PETSc library and uses a Krylov method with an additive Schwarz method for parallel solutions. Computations are presented for a blunt-body flow over a range of Reynolds numbers, and results show that the hybrid line/point-relaxation and the fullycoupled methods both converge to steady state independent of the free-stream Reynolds number and grid stretching. The approximate hybrid method converges in less CPU time in this case. Memory usage and elapsed CPU time results are shown for perfect-gas and 11 species air chemistry calculations. The memory requirements triple when the fully-coupled method is used for both equation sets. Results also show that the fully-coupled method is superior to the approximate method when the flow is strongly anisotropic or when the mesh topology is not designed to take advantage of the hybrid method.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 18th AIAA Computational Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages1616-1631
Number of pages16
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

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