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<body class='hmmessage'><div dir='ltr'>Hello,<br><br> I am trying to solve a linear system with KSP for a 3-D domain. The computational domain is a cubic space with Neumann condition on the lateral sides( y, and z directions). A smaller round plate is on the left side in x direction. The right side is a rectangular plane either with or without a hole. In testing studies, the KSP solver works fine both with and without -pc_type hypre runtime option for the domain with a whole plane(without a hole) on the right, but diverges for the case of a plane with a hole with -ps_type hypre option. <br><br> My question is whether the hypre pre-conditioner is sensitive to the geometry boundary? If the answer is yes, is there any other pre-conditioner available for my particular case(the domain with a plane which with a hole on the right side) to reduce the number of iterations? Thanks in advance.<br> </div></body>
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