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Boundary layer mesh gives problems in iterative solvers?
Posted Mar 15, 2010, 6:19 a.m. EDT 2 Replies
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I am trying to solve a 3D turbulent flow problem with k-eps model. I have found that when I try to solve a model meshed with boundary layer mesh the iterative linear solvers find it very tough to coverge. I have tried different preconditioners and solvers, but the problem remains. If I solve them with direct solvers there is not such a problem. I also found that if the aspect ratio of the last element of the boundary layer (next to tetraedral elements) is not very high it sometimes converges.
There is anything in the solvers that can help in this regard? Or is it that COMSOL iterative solvers are just not good enough for this flow problems with boundary elements?
P.S.: I have checked this problem also in very simple 2D model (just a straight tube)