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Assessment of Preconditioning Methods

Radespiel, R. and Turkel, E. and Kroll, N. (1995) Assessment of Preconditioning Methods. DLR-Forschungsbericht. 95-29.

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Abstract

The present report investigates the use of the unsteady compressible flow problems. For low speed flow the system is stiff since the ratio of the convective speed of sound is very small. To overcome this difficulty we alter the time dependency of the equations while retaining the same steady state operator. In order to achieve high numerical resolution we also alter the artificial dissipation of the numerical scheme. The definition of preconditioners and artificial dissipation terms can be formulated conveniently by using other sets of dependent variables rather than the conservative variables. The effects of different preconditioners, artificial dissipation and grid density on accuracy and convergence to the steady state of the numerical solutions are presented in detail. The numerical results obtained for inviscid and viscous 2D and 3D flows indicate that efficient multigrid computations of flows with very low Mach numbers are now.

Document Type:Monograph (DLR-Forschungsbericht)
Additional Information: LIDO-Berichtsjahr=1995,
Title:Assessment of Preconditioning Methods
Authors:
AuthorsInstitution or Email of Authors
Radespiel, R.UNSPECIFIED
Turkel, E.Tel Aviv University
Kroll, N.UNSPECIFIED
Date:1995
Status:Published
Keywords:Preconditioning, incompressible flow, artificial dissipation, viscous flow
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Grundlagen Raumtransport - Anlagen und Messtechnik (old)
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:05

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