Analysis of preconditioning and multigrid for Euler flows with low-subsonic regions |
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Authors: | B. Koren B. van Leer |
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Affiliation: | (1) Centrum voor Wiskunde en Informatica, Afdeling Numerieke Wiskunde, P.O. Box 94079, 1090 GB Amsterdam, The Netherlands;(2) Department of Aerospace Engineering, The University of Michigan, 1320 Beal Avenue, 48109-2118 Ann Arbor, MI, USA |
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Abstract: | For subsonic flows and upwind-discretized, linearized 1-D Euler equations, the smoothing behavior of multigrid-accelerated point Gauss-Seidel relaxation is analyzed. Error decay by convection across domain boundaries is also discussed. A fix to poor convergence rates at low Mach numbers is sought in replacing the point relaxation applied to unconditioned Euler equations, by locally implicit time-stepping applied to preconditioned Euler equations. The locally implicit iteration step is optimized for good damping of high-frequency errors. Numerical inaccuracy at low Mach numbers is also addressed.The work reported was performed in the framework of the BRITE-EURAM Aeronautics R&D Programme of the European Communities (Contract No. AER2-CT92-0040). The work was started during the second author's visit to CWI in 1993. |
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Keywords: | Subsonic flows Euler equations multigrid methods preconditioning matrices convergence and accuracy analyses |
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