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Help with meshing thin geometry

Posted Aug 8, 2011, 4:43 p.m. EDT Mesh Version 4.3b 6 Replies

Ryan Chow
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Hi I am new to COMSOL and have trouble meshing the attached file. It consists of a very thin layer between 2 thicker ones and thin spacing between the bars. Does anyone have any suggestions/link to tutorials that might help?

Thanks

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6 Replies Last Post Dec 28, 2013, 6:46 p.m. EST
Yoann Many
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Posted: 1 decade ago Aug 9, 2011, 3:29 a.m. EDT
Hi,

I suggest you build 2 free triangular, ther first for the thin layer and the second for the others. For the thin layer, you might want to add two distribution node and specify a pretty high number of elements, to be sure to have a mesh thin enough. the two others will adapt at the neighborhood of the thin one to the distribution nodes, and you can after specify a size for each free triangular to tweak it as you prefer...

Good luck
Hi, I suggest you build 2 free triangular, ther first for the thin layer and the second for the others. For the thin layer, you might want to add two distribution node and specify a pretty high number of elements, to be sure to have a mesh thin enough. the two others will adapt at the neighborhood of the thin one to the distribution nodes, and you can after specify a size for each free triangular to tweak it as you prefer... Good luck
Ryan Chow
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Posted: 1 decade ago Aug 10, 2011, 3:53 p.m. EDT
im trying to mesh part of the thin layer using free triangular and a distribution set to 10 ( i labeled it side1, one of the copper electrodes) but it is taking quite a long time, even with my i7 sandy bridge cpu. Im not sure if im doing what you described. Do you mind meshing a section of it for me as an example? my email is chowryan@gmail.com

Thanks,
Ryan Chow
im trying to mesh part of the thin layer using free triangular and a distribution set to 10 ( i labeled it side1, one of the copper electrodes) but it is taking quite a long time, even with my i7 sandy bridge cpu. Im not sure if im doing what you described. Do you mind meshing a section of it for me as an example? my email is chowryan@gmail.com Thanks, Ryan Chow
Ryan Chow
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Posted: 1 decade ago Aug 10, 2011, 4:41 p.m. EDT
ok i tried following your advice but am not sure if it is correct. the mesh completes to 100% (after about an hour or so) but at the last moment gives errors on several of the thin faces. Ive attached some jpegs showing the mesh settings and errors.

Thanks!
ok i tried following your advice but am not sure if it is correct. the mesh completes to 100% (after about an hour or so) but at the last moment gives errors on several of the thin faces. Ive attached some jpegs showing the mesh settings and errors. Thanks!

Attachments:

Ryan Chow
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Posted: 1 decade ago Aug 15, 2011, 2:36 a.m. EDT
bump?
bump?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Aug 17, 2011, 1:58 a.m. EDT
Hi

One question: why do you mesh your "thin" copper layers as bulk 3D devices ?, do you exepect gradients in the thickness ?

I would suggest to remove these thin volumes and use "surface physics", and as everything is square you could use a simple mapped mesh overall

Take a look at the doc about "thin layers"

--
Good luck
Ivar
Hi One question: why do you mesh your "thin" copper layers as bulk 3D devices ?, do you exepect gradients in the thickness ? I would suggest to remove these thin volumes and use "surface physics", and as everything is square you could use a simple mapped mesh overall Take a look at the doc about "thin layers" -- Good luck Ivar
Giorgio Bernardini
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Posted: 1 decade ago Dec 28, 2013, 6:46 p.m. EST

Hi

One question: why do you mesh your "thin" copper layers as bulk 3D devices ?, do you exepect gradients in the thickness ?

I would suggest to remove these thin volumes and use "surface physics", and as everything is square you could use a simple mapped mesh overall

Take a look at the doc about "thin layers"

--
Good luck
Ivar


Hi Ivar,

this problem is old but I have exactly the same problem and I haven't found any other problems similar to this one in the forum.

I need to study the eigenfrequency of a quartz tuning fork with thin layers of gold around it (they form the electrodes).

Sorry but I haven't found the doc "surface physics" you suggested some years ago, maybe they have removed it.

Thank you,

Giorgio Bernardini

[QUOTE] Hi One question: why do you mesh your "thin" copper layers as bulk 3D devices ?, do you exepect gradients in the thickness ? I would suggest to remove these thin volumes and use "surface physics", and as everything is square you could use a simple mapped mesh overall Take a look at the doc about "thin layers" -- Good luck Ivar [/QUOTE] Hi Ivar, this problem is old but I have exactly the same problem and I haven't found any other problems similar to this one in the forum. I need to study the eigenfrequency of a quartz tuning fork with thin layers of gold around it (they form the electrodes). Sorry but I haven't found the doc "surface physics" you suggested some years ago, maybe they have removed it. Thank you, Giorgio Bernardini

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