Ivar KJELBERG
COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted:
1 decade ago
29.09.2011, 07:29 GMT-4
Hi
are you following the thread
http://www.comsol.eu/community/forums/general/thread/22723/#p60850 ?
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Good luck
Ivar
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Posted:
1 decade ago
29.09.2011, 08:37 GMT-4
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)
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
02.10.2011, 09:59 GMT-4
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