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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Boundary Stress

Posted Aug 28, 2015, 11:19 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.4 1 Reply

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Dear all,

i have a problem. I try to simulate a fluid flow effected by a boundary stress on a key hole. See attached mph-file.
With a very big mesh, comsol solve the problem. But with a smaller mesh, comsol does not solve the problem any more.
Have someone an idea why? Or what i can change to get a better convergence with this problem?
Thanks to all.
Best regards
Johannes

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1 Reply Last Post Sep 1, 2015, 8:28 a.m. EDT
Hinrich Arnoldt COMSOL Employee

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Posted: 9 years ago Sep 1, 2015, 8:28 a.m. EDT
Dear Johannes,

your mesh is lacking boundary elements which you need for fluid flow.
Just switch to a physics induced mesh sequence to see how such a mesh is built up. The solver then also converges for larger meshes.

Best
Hinrich
Dear Johannes, your mesh is lacking boundary elements which you need for fluid flow. Just switch to a physics induced mesh sequence to see how such a mesh is built up. The solver then also converges for larger meshes. Best Hinrich

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