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Mesh generation in Comsol 4.3b for Stacked

Posted May 6, 2014, 5:00 a.m. EDT Mesh Version 5.0 6 Replies

Mohsen Torabi
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Hi Guys.
I have 4 stacked layers starting from very thick (50 um) to very thin (30 nm) thicknesses. I have problem with mesh generation. Tried everything but could not mesh the geometry. The thinnest layer cannot be meshed. Could anyone help me out here?!
Thank you.
Mohsen

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6 Replies Last Post Feb 27, 2015, 5:08 a.m. EST
Lasse Murtomäki
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Posted: 1 decade ago May 6, 2014, 5:38 a.m. EDT
I am using version 4.4, so you cannot open my file, but I tell you what to do.
1. Make a free triangular mesh on the top face of the stack.
2. Sweep that mesh across the whole stack.
3. You can then refine the mesh in vertical direction with the distribution property, i.e. defining to each layer how many elements you wish.

I made a mesh with 5 layers to the three upper layers and 25 layers to the lowest one. Attached a picture. You cannot see the thinnest layer in this magnification, but trust me, there are 5 layers also in the uppermost one.

"Complete mesh consists of 31280 domain elements, 6790 boundary elements, and 520 edge elements."

Wish this helps
Lasse
I am using version 4.4, so you cannot open my file, but I tell you what to do. 1. Make a free triangular mesh on the top face of the stack. 2. Sweep that mesh across the whole stack. 3. You can then refine the mesh in vertical direction with the distribution property, i.e. defining to each layer how many elements you wish. I made a mesh with 5 layers to the three upper layers and 25 layers to the lowest one. Attached a picture. You cannot see the thinnest layer in this magnification, but trust me, there are 5 layers also in the uppermost one. "Complete mesh consists of 31280 domain elements, 6790 boundary elements, and 520 edge elements." Wish this helps Lasse

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Mohsen Torabi
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Posted: 1 decade ago May 6, 2014, 6:16 a.m. EDT
Lasse,
Thank you for the suggestion. I have encountered another problem while meshing the topmost layer, which is the thinnest one. Consider we just have a block of 3000*3000*0.03 um. If I mesh it with Tetrahedral it gives me an error which indicates that the shortest edge is smaller than the minimum mesh size. If I wanna refine it with Size, and put for example 0.025 um for the minimum edge size, then even with supercomputer it doesn't process the meshing beyond 1% !!! Would you advise me how to mesh this thin layer?
Thank you.
Mohsen
Lasse, Thank you for the suggestion. I have encountered another problem while meshing the topmost layer, which is the thinnest one. Consider we just have a block of 3000*3000*0.03 um. If I mesh it with Tetrahedral it gives me an error which indicates that the shortest edge is smaller than the minimum mesh size. If I wanna refine it with Size, and put for example 0.025 um for the minimum edge size, then even with supercomputer it doesn't process the meshing beyond 1% !!! Would you advise me how to mesh this thin layer? Thank you. Mohsen
Lasse Murtomäki
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Posted: 1 decade ago May 6, 2014, 7:50 a.m. EDT
No tetrahedrons but a triangular mesh on the top. It is found under "More operations". You mesh first only the uppermost face which is then swept across the entite stack. You must learn the swept mesh, it is the only way of meshing thin layers. If you had Comsol 4.4 I could send you the file.
No tetrahedrons but a triangular mesh on the top. It is found under "More operations". You mesh first only the uppermost face which is then swept across the entite stack. You must learn the swept mesh, it is the only way of meshing thin layers. If you had Comsol 4.4 I could send you the file.
Mohsen Torabi
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Posted: 1 decade ago May 6, 2014, 8:00 a.m. EDT
YES! It works!! Thanks a lot Lasse.
YES! It works!! Thanks a lot Lasse.
Osama Mohammad
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Posted: 9 years ago Feb 27, 2015, 4:37 a.m. EST
Hi
please help me in meshing my model.some time the program makes new mesh and fail to mesh.
I have 20 small cylinders in 1 mm .and model Ellipse (a=40,b=10).
I tried many time but failed.
thank you
Hi please help me in meshing my model.some time the program makes new mesh and fail to mesh. I have 20 small cylinders in 1 mm .and model Ellipse (a=40,b=10). I tried many time but failed. thank you
Lasse Murtomäki
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Posted: 9 years ago Feb 27, 2015, 5:08 a.m. EST
Your cylinder height is 1 mm? Cylinder cross-section is elliptic? 20 cylinders in a stack?

Mesh first the top (or bottom) surface with triangles, then sweep across the cylinder and add distribution to the swept mesh.

I need to see the geometry to reply more accurately.

br
Lasse

Your cylinder height is 1 mm? Cylinder cross-section is elliptic? 20 cylinders in a stack? Mesh first the top (or bottom) surface with triangles, then sweep across the cylinder and add distribution to the swept mesh. I need to see the geometry to reply more accurately. br Lasse

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