Nonsymmetric Problems



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Nonsymmetric Problems

The preconditioners given above extend naturally to nonsymmetric 's (e.g., convection-diffusion problems), at least when the nonsymmetric part is not too large. The nice theoretical convergence rates can be retained provided that the coarse grid size is chosen small enough (depending on the size of the nonsymmetric part of ) (see Cai and Widlund [43]). Practical implementations (especially for parallelism) of nonsymmetric domain decomposition methods are discussed in [138][137].



Jack Dongarra
Mon Nov 20 08:52:54 EST 1995