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A diagonal algorithm for the method of pseudocompressibilityThe method of pseudocompressibility has been shown to be an efficient method for obtaining a steady-state solution to the incompressible Navier-Stokes equations. Recent improvements to this method include the use of a diagonal scheme for the inversion of the equations at each iteration. The necessary transformations have been derived for the pseudocompressibility equations in generalized coordinates. The diagonal algorithm reduces the computing time necessary to obtain a steady-state solution by a factor of nearly three. Implicit viscous terms are maintained in the equations, and it has become possible to use fourth-order implicit dissipation. The steady-state solution is unchanged by the approximations resulting from the diagonalization of the equations. Computed results for flow over a two-dimensional backward-facing step and a three-dimensional cylinder mounted normal to a flat plate are presented for both the old and new algorithms. The accuracy and computing efficiency of these algorithms are compared.
Document ID
19860053690
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rogers, S. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Kwak, D.
(NASA Ames Research Center Moffett Field, CA, United States)
Chang, J. L. C.
(Rockwell International Corp. Rocketdyne Div., Canoga Park, CA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1986
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 86-1060
Accession Number
86A38428
Distribution Limits
Public
Copyright
Other

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