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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Mesh Problem with helix

Posted 2011年8月9日 GMT-4 09:06 Fluid & Heat, Geometry, Mesh Version 4.1 3 Replies

Albert Hutterer
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Hello,

I´m actually trying to simulate the flow in a 3D Helical-like solid. The problem is that I alwas get an error during meshing the surface.

Is it possible that this is an dimension issue? becaus the small radius is int the order of µm and the bigger radius in the order of cm?

Thank you very much for your help.

Kind Regards ,

Albert

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3 Replies Last Post 2011年8月19日 GMT-4 09:52
Dennis Brown
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Posted: 1 decade ago 2011年8月10日 GMT-4 11:51
One thing to try is to break your problem up into more domains . For instance, instance of creating your structure with just one helix primitive, you might want to try 3-4, maybe more separates. Might be easier to mesh when you can break your geometry up into smaller chunks. You may also have to try using as many free tets in the mesh node as you have domains. If you have four domains, have four tets with each tet assigned to one of the domains.
One thing to try is to break your problem up into more domains . For instance, instance of creating your structure with just one helix primitive, you might want to try 3-4, maybe more separates. Might be easier to mesh when you can break your geometry up into smaller chunks. You may also have to try using as many free tets in the mesh node as you have domains. If you have four domains, have four tets with each tet assigned to one of the domains.
Albert Hutterer
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Posted: 1 decade ago 2011年8月19日 GMT-4 05:35
Thanks for your help.

I tried to simulate just one helix bust still got the same Problem.

I also tried to set the inlet boundry with a free triangular mesh with max dimensions of 5µm. and a swept mesh for the domain with a distribiution of 500.

But I still have the same problem. It doesn´t solve.

Do you have another idea?

Thank you.

Kind regards,

Albert
Thanks for your help. I tried to simulate just one helix bust still got the same Problem. I also tried to set the inlet boundry with a free triangular mesh with max dimensions of 5µm. and a swept mesh for the domain with a distribiution of 500. But I still have the same problem. It doesn´t solve. Do you have another idea? Thank you. Kind regards, Albert
Dennis Brown
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Posted: 1 decade ago 2011年8月19日 GMT-4 09:52
I was able to get the structure to mesh but I am not 100% sure if this is what you want or not. Look it over and let me know if it is good or not. I do not have the physics setup, just the mesh working. File is in english version of comsol. I did the file in v4.1 so I think you will be able to open it ok.
I was able to get the structure to mesh but I am not 100% sure if this is what you want or not. Look it over and let me know if it is good or not. I do not have the physics setup, just the mesh working. File is in english version of comsol. I did the file in v4.1 so I think you will be able to open it ok.

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