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Help needed regarding meshing a 3d model

Posted Sep 29, 2011, 3:33 a.m. EDT Mesh Version 3.5a, Version 4.2 3 Replies

Qasim Ali Chaudhry
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Dear members,

I have a 3d model which contains very thin domains (layers). I tried different ways to mesh this geometry, but failed. Can you please guide me any technique by which I may mesh this model.

Thanks in advance.

Best Regards

Qasim

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3 Replies Last Post Oct 2, 2011, 9:59 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Sep 29, 2011, 7:29 a.m. EDT
Hi

are you following the thread

www.comsol.eu/community/forums/general/thread/22723/#p60850 ?



--
Good luck
Ivar
Hi are you following the thread http://www.comsol.eu/community/forums/general/thread/22723/#p60850 ? -- Good luck Ivar
Qasim Ali Chaudhry
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Posted: 1 decade ago Sep 29, 2011, 8:37 a.m. EDT
Dear Ivar,

Thanks for your reply. I have seen the thread but it seems that I need to define the mesh manually in the thin membranes. Actually in my geometry, the flux passes through the membranes and there is jump in the concentration between the membrane and adjacent domain. I tried to mesh the thin layer independently, but it did not generate. In my computer, memory is not an issue. Can you please guide me how can I define the mesh in domain # 8.

Thanks
Dear Ivar, Thanks for your reply. I have seen the thread but it seems that I need to define the mesh manually in the thin membranes. Actually in my geometry, the flux passes through the membranes and there is jump in the concentration between the membrane and adjacent domain. I tried to mesh the thin layer independently, but it did not generate. In my computer, memory is not an issue. Can you please guide me how can I define the mesh in domain # 8. Thanks
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 2, 2011, 9:59 a.m. EDT
Hi

meshing is somewhat an art ;) Have you tried to define a "size custom resolve small features 2" for a mesh with your thin layer, then you should at least get 2 elements in the thickness (but you might ran out of ram), normally when one have very large differences in the thickness, one should replace a "thin" layer by a "thin BC" conditions, merging the physics into the "thin boundary". this means that one consider the effect in the thickness to be constant. There is a few examples in the Model Library. If your physics is not already defined a s thin boundary, you need to define it yourself, by setting up the equations (you might need to use assembly mode to get hand on the two boundary interfaces up and down. It takes some time but is very powerful, check your doc

--
Good luck
Ivar
Hi meshing is somewhat an art ;) Have you tried to define a "size custom resolve small features 2" for a mesh with your thin layer, then you should at least get 2 elements in the thickness (but you might ran out of ram), normally when one have very large differences in the thickness, one should replace a "thin" layer by a "thin BC" conditions, merging the physics into the "thin boundary". this means that one consider the effect in the thickness to be constant. There is a few examples in the Model Library. If your physics is not already defined a s thin boundary, you need to define it yourself, by setting up the equations (you might need to use assembly mode to get hand on the two boundary interfaces up and down. It takes some time but is very powerful, check your doc -- Good luck Ivar

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