Implicit solvers for unstructured meshesImplicit methods for unstructured mesh computations are developed and tested. The approximate system which arises from the Newton-linearization of the nonlinear evolution operator is solved by using the preconditioned generalized minimum residual technique. These different preconditioners are investigated: the incomplete LU factorization (ILU), block diagonal factorization, and the symmetric successive over-relaxation (SSOR). The preconditioners have been optimized to have good vectorization properties. 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 investigated. Results are presented for inviscid and turbulent viscous calculations on single and multielement airfoil configurations using globally and adaptively generated meshes.
Document ID
19910056089
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Venkatakrishnan, V. (Computer Sciences Corp. Moffett Field, CA, United States)
Mavriplis, Dimitri J. (NASA Langley Research Center; ICASE Hampton, VA, United States)