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Implicit solvers for unstructured meshesImplicit methods were developed and tested for unstructured mesh computations. The approximate system which arises from the Newton linearization of the nonlinear evolution operator is solved by using the preconditioned GMRES (Generalized Minimum Residual) technique. Three different preconditioners were studied, namely, the incomplete LU factorization (ILU), block diagonal factorization, and the symmetric successive over relaxation (SSOR). The preconditioners were optimized to have good vectorization properties. SSOR and ILU were also studied as iterative schemes. The various methods are compared over a wide range of problems. Ordering of the unknowns, which affects the convergence of these sparse matrix iterative methods, is also studied. Results are presented for inviscid and turbulent viscous calculations on single and multielement airfoil configurations using globally and adaptively generated meshes.
Document ID
19910014812
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Venkatakrishnan, V. (Computer Sciences Corp. Moffett Field, CA., United States)
Mavriplis, Dimitri J. (Institute for Computer Applications in Science and Engineering Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1991
Subject Category
Aerodynamics
Report/Patent Number
ICASE-91-40
NAS 1.26:187564
AD-A237203
NASA-CR-187564
Accession Number
91N24125
Funding Number(s)
CONTRACT_GRANT: NAS1-18605
PROJECT: RTOP 505-90-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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