Sorry about not following up. I also find these results peculiar. Lawrence Mitchell <[email protected]> writes: > So I'm sort of none-the-wiser. I'm a little bit at a loss as to why > this occurs, but either switching to Richardson+SOR or Cheby/SOR with > more that one SOR sweep appears to fix the problems, so I might just > punt for now.
What discretization and mesh is this running on? Is there something special about the decomposition with 2 subdomains? Are the Chebyshev estimates far from converging? Something is funky because if you have a discretization with good h-ellipticity, reliable convergence should not be a problem.
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