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Effect of grid aspect ratio on convergenceThe effects of high-aspect-ratio grids on algorithm convergence are considered by means of vector stability theory and computational experiments. The results indicate that approximately factored implicit schemes experience convergence deterioration because of nonoptimum local time-stepping procedures and increased need for viscous preconditioning. Based on this insight, an enhanced algorithm is devised using improved selection of the local time step, appropriate definition of the viscous preconditioning matrix, and proper implementation of the boundary conditions. The new algorithm provides uniformly efficient convergence at all aspect ratios for both Euler and Navier-Stokes computations for a variety of test problems.
Document ID
19950055610
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Buelow, P. E. O.
(Pennsylvania State University University Park, PA, United States)
Venkateswaran, S.
(Pennsylvania State University University Park, PA, United States)
Merkle, Charles L.
(Pennsylvania State University University Park, PA, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1994
Publication Information
Publication: AIAA Journal
Volume: 32
Issue: 12
ISSN: 0001-1452
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
95A87209
Funding Number(s)
CONTRACT_GRANT: NAGW-1356
CONTRACT_GRANT: NAS8-38861
Distribution Limits
Public
Copyright
Other

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