PBiCG: Suggest changing to the more robust PBiCGStab solver
if convergence is not achieved within the maximum number of iterations. Sometimes, particularly running in parallel, PBiCG fails to converge or diverges without warning or obvious cause leaving a solution field containing significant errors which can cause divergence of the application. PBiCGStab is more robust and does not suffer from the problems encountered with PBiCG.
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