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Will The Unnecessary Line Segments affect Result?

Posted Nov 8, 2019, 11:30 p.m. EST Low-Frequency Electromagnetics, Plasma Physics, General 2 Replies

Wancong Li
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I'm calculating interaction among electromagnetic field, metal and other fields. I find that the results is very strange when there are unnecessary lines in structure with the same limited mesh size. The strange is that there is something like guided wave between unnecessary lines and metallic boundary. I'm sure that my physical settings are right.

By the way, what I mean unnecessary lines is that adding a line in geometry and create a new domain around the metal. But this line has no physical meaning.

Could anyone tell me if the unnecessary lines will affect the results ?

Thank you very much in advance.

2 Replies Last Post Nov 9, 2019, 9:06 p.m. EST
Robert Koslover Certified Consultant
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Posted: 4 years ago Nov 9, 2019, 1:43 p.m. EST
Updated: 4 years ago Nov 9, 2019, 8:43 a.m. EST

Extra/unnecessary lines should not affect results. If you have observed an effect, then this means there is something wrong with your model. The extra lines in your geometry will affect the mesh. However, if the mesh is computationally-appropriate in both cases, then results should not be noticeably different. Your extra lines may be incorrectly tied to an unwanted boundary condition (e.g., a perfect conductor), and if so, that association needs to be removed. Your extra lines may have caused an error in the interpretation of the geometry by the Comsol Multiphysics code. If so, you need to correct that, by either removing those extra lines or by taking other steps to ensure that the code understands (aka, resolves) the geometry as you actually intended it to be. In general, it is a good idea to minimize the presence of unnecessary lines, surfaces, and volumes in a model.

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Extra/unnecessary lines *should* not affect results. If you have observed an effect, then this means there is something wrong with your model. The extra lines in your geometry *will* affect the mesh. However, if the mesh is computationally-appropriate in both cases, then results should not be noticeably different. Your extra lines may be incorrectly tied to an unwanted boundary condition (e.g., a perfect conductor), and if so, that association needs to be removed. Your extra lines may have caused an error in the interpretation of the geometry by the Comsol Multiphysics code. If so, you need to correct that, by either removing those extra lines or by taking other steps to ensure that the code understands (aka, resolves) the geometry as you actually intended it to be. In general, it is a good idea to minimize the presence of unnecessary lines, surfaces, and volumes in a model.
Wancong Li
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Posted: 4 years ago Nov 9, 2019, 9:06 p.m. EST

Thank you very much.

Thank you very much.

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