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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 The information provided may be out of date.

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Create a mesh with disproportionnal object

Posted Jun 7, 2011, 10:31 a.m. EDT Mesh Version 4.0a 3 Replies

Nicolas Dufour
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Hello everybody,

I'm working on a micro-structure with these dimensions : 2000µm (x) / 2000µm (y) / 1µm (z) and the problem is that I don't know how to create a good mesh to have a good volume resolution without 1 million elements

Thanks
3 Replies Last Post Jun 7, 2011, 11:23 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago Jun 7, 2011, 11:01 a.m. EDT
Have you tried sweep meshing? See User's Guide, Chapter 17.
Have you tried sweep meshing? See User's Guide, Chapter 17.
Nicolas Dufour
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Posted: 1 decade ago Jun 7, 2011, 11:13 a.m. EDT
Yes I have tried a swept mesh, in all directions, and I'm always around zero in quality
Yes I have tried a swept mesh, in all directions, and I'm always around zero in quality
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago Jun 7, 2011, 11:23 a.m. EDT
Given how the quality factor is defined, i.e. purely based on geometric considerations, that's expected and in fact it's the whole point of using a swept mesh here: you are trying to create elements that are elongated in a manner similar to your geometry. The real question is whether the mesh is able to capture the physics. If it is, then the quality of the mesh can be low, especially if you use a direct solver (iterative solvers might complain about ill-conditioning - that depends on your physics of course).
Given how the quality factor is defined, i.e. purely based on geometric considerations, that's expected and in fact it's the whole point of using a swept mesh here: you are trying to create elements that are elongated in a manner similar to your geometry. The real question is whether the mesh is able to capture the physics. If it is, then the quality of the mesh can be low, especially if you use a direct solver (iterative solvers might complain about ill-conditioning - that depends on your physics of course).

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