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Can't create a mesh

Posted Dec 8, 2023, 9:49 a.m. EST Mesh 6 Replies

Matthias Brunner
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Hi Comsol-Community,

I am utterly failing to create a mesh for my model. I tried using this guide as well as swept meshes from this guide.

Nevertheless, I always obtain some error or another and am wondering if someone can give me advice on how to best approach this mesh.

Best, Matthias

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6 Replies Last Post Dec 9, 2023, 7:11 a.m. EST
Edgar J. Kaiser Certified Consultant
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Posted: 12 months ago Dec 8, 2023, 12:19 p.m. EST

Hi Matthias,

the mesher completes when I set the it to 'finer'. However, it throws a few warnings and shows the locations. You may want to check those spots for geometry errors. CAD imports are often not optimized for meshing and have small inconstistencies that do not disturb for manufacturing but kill a mesher. You can run the model despite the warnings of course and see if it looks reasonable.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Matthias, the mesher completes when I set the it to 'finer'. However, it throws a few warnings and shows the locations. You may want to check those spots for geometry errors. CAD imports are often not optimized for meshing and have small inconstistencies that do not disturb for manufacturing but kill a mesher. You can run the model despite the warnings of course and see if it looks reasonable. Cheers Edgar
Matthias Brunner
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Posted: 12 months ago Dec 8, 2023, 1:40 p.m. EST

Hi Matthias,

the mesher completes when I set the it to 'finer'. However, it throws a few warnings and shows the locations. You may want to check those spots for geometry errors. CAD imports are often not optimized for meshing and have small inconstistencies that do not disturb for manufacturing but kill a mesher. You can run the model despite the warnings of course and see if it looks reasonable.

Cheers Edgar

Hi Edgar,

thanks for your answer!

That's weird though because just running the mesher with the setting "finer" does not compile for me. I get the following error:

Failed to generate mesh for domain. - Domain: 5 Failed to respect edge element on geometry edge. - Edge: 622 Failed to move mesh point in domain. - x-coordinate: 8.9935 - y-coordinate: 8.70001 - z-coordinate: -0.411481

Cheers, Matthias

>Hi Matthias, > >the mesher completes when I set the it to 'finer'. However, it throws a few warnings and shows the locations. >You may want to check those spots for geometry errors. CAD imports are often not optimized for meshing and have small inconstistencies that do not disturb for manufacturing but kill a mesher. >You can run the model despite the warnings of course and see if it looks reasonable. > >Cheers >Edgar Hi Edgar, thanks for your answer! That's weird though because just running the mesher with the setting "finer" does not compile for me. I get the following error: > Failed to generate mesh for domain. > - Domain: 5 > Failed to respect edge element on geometry edge. > - Edge: 622 > Failed to move mesh point in domain. > - x-coordinate: 8.9935 > - y-coordinate: 8.70001 > - z-coordinate: -0.411481 Cheers, Matthias
Edgar J. Kaiser Certified Consultant
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Posted: 12 months ago Dec 8, 2023, 1:41 p.m. EST
Updated: 12 months ago Dec 8, 2023, 1:49 p.m. EST

Sorry, I was using fine, not finer. I guess you won't get around fixing the geometry. Look at the coordinates the mesher errors or warnings point at.

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Sorry, I was using fine, not finer. I guess you won't get around fixing the geometry. Look at the coordinates the mesher errors or warnings point at.
Matthias Brunner
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Posted: 12 months ago Dec 8, 2023, 3:32 p.m. EST
Updated: 12 months ago Dec 8, 2023, 3:32 p.m. EST

Sorry, I was using fine, not finer. I guess you won't get around fixing the geometry. Look at the coordinates the mesher errors or warnings point at.

"Fine" is also not working for me.

Hm, anyways, my problem is that I don't know how to fix the geometry. I know where the error is but what would I have to change at the given error? It says it can't move the mesh point in the domain but that doesn't really tell me what is wrong with the geometry.

>Sorry, I was using fine, not finer. I guess you won't get around fixing the geometry. Look at the coordinates the mesher errors or warnings point at. "Fine" is also not working for me. Hm, anyways, my problem is that I don't know how to fix the geometry. I know where the error is but what would I have to change at the given error? It says it can't move the mesh point in the domain but that doesn't really tell me what is wrong with the geometry.
Edgar J. Kaiser Certified Consultant
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Posted: 12 months ago Dec 8, 2023, 4:07 p.m. EST

It can be many things. Intersections, small discontinuities, sliver faces, etc. I saw many chamfers. You probably need to check in the CAD source. If you have the Design Module you can try the repair functions. I cannot afford the time to analyze your geometry in detail. Try to simplify as far as possible and avoid small features that don't affect the simulation.

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
It can be many things. Intersections, small discontinuities, sliver faces, etc. I saw many chamfers. You probably need to check in the CAD source. If you have the Design Module you can try the repair functions. I cannot afford the time to analyze your geometry in detail. Try to simplify as far as possible and avoid small features that don't affect the simulation.
Matthias Brunner
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Posted: 12 months ago Dec 9, 2023, 7:11 a.m. EST

It can be many things. Intersections, small discontinuities, sliver faces, etc. I saw many chamfers. You probably need to check in the CAD source. If you have the Design Module you can try the repair functions. I cannot afford the time to analyze your geometry in detail. Try to simplify as far as possible and avoid small features that don't affect the simulation.

Alright, I'll try! Thanks a lot for your help :)

>It can be many things. Intersections, small discontinuities, sliver faces, etc. I saw many chamfers. You probably need to check in the CAD source. If you have the Design Module you can try the repair functions. I cannot afford the time to analyze your geometry in detail. Try to simplify as far as possible and avoid small features that don't affect the simulation. Alright, I'll try! Thanks a lot for your help :)

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