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Issues at connecting one coarser mesh and an extremely thin mesh

Posted 5 apr 2019, 09:27 GMT-4 Low-Frequency Electromagnetics, Mesh Version 5.3a 3 Replies

Paul Lagouanelle
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Hi everyone,

Here is my problem, I got a really thin (1mm) frame (and 1.5mx0.5m) inside a big box (2mx2mx1m) and I want to have an extremelly fine mesh in the frame and a coarser one outside. Inside the frame I want exactly 10 layers of prisms, the thickness of each layer is therefore 0.1mm. Please look at the fille attached !

I first tried to use a surface mesh (free triangular mesh) on one face of the frame and swept it through the frame with a distribution of 10 layers, the remaining domains were meshed using free tetrahedral with a coarser mesh. But unfortunately I had some many errors saying that the boundaries of the two meshes couldn't be connected or that there was an error in the meshing domain...

Then I did exactly the same thing but using the boundary layer feature on the frame with 10 layers of 0.1mm and the boundaries being only one face (I also did 5 layers with the two faces) and I got the same kind of error.

Initially I wanted to mesh so thin in the frame to observe the skin effect (I'm working at 85kHz with conducitivites up to 10^7 S/m)...

Does anyone know how to do this ?

Cheers !

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3 Replies Last Post 5 apr 2019, 14:07 GMT-4
Edgar J. Kaiser Certified Consultant
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Posted: 5 years ago 5 apr 2019, 10:31 GMT-4

Hi Paul,

I modified your mesh so it meshes now. It still throws a warning because the aspect ratio in the thin layer is still really bad. You may want to adjust that, but may well be it doesn't matter.

Good luck Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Paul, I modified your mesh so it meshes now. It still throws a warning because the aspect ratio in the thin layer is still really bad. You may want to adjust that, but may well be it doesn't matter. Good luck Edgar
Paul Lagouanelle
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Posted: 5 years ago 5 apr 2019, 11:47 GMT-4

Hi Edgar, Thanks for trying but unfortunately I'm on COMSOL 5.3a and it's not working with your 5.4 file :( ! Cheers

Hi Edgar, Thanks for trying but unfortunately I'm on COMSOL 5.3a and it's not working with your 5.4 file :( ! Cheers
Edgar J. Kaiser Certified Consultant
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Posted: 5 years ago 5 apr 2019, 14:07 GMT-4

Hi Paul,

I should have looked to your version information. Seems the mesher really improved in 5.4. I implemented the same sequence in 5.3a and it fails. I played a little with the size settings, but no success.

You may consider helper boundaries, i.e a sequence of boxes around the sheet. This may help the mesher.

I send the model with the sequence that works in 5.4.

Good luck Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Paul, I should have looked to your version information. Seems the mesher really improved in 5.4. I implemented the same sequence in 5.3a and it fails. I played a little with the size settings, but no success. You may consider helper boundaries, i.e a sequence of boxes around the sheet. This may help the mesher. I send the model with the sequence that works in 5.4. Good luck Edgar

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