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Problem with Extremly Thin Object
Posted Sep 18, 2019, 5:11 a.m. EDT Electromagnetics, Low-Frequency Electromagnetics, Mesh 2 Replies
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Hello everyone,
I'm a beginner with COMSOL and recently got a problem with my simulation. The modell is a thin copper coil, with the section of 
. The material is copper and the domain physics is defined as coil/single conductor. I ran the simulation at low frequency(70-100kHz), but the solver cannot converge, no matter how I tried to change or refine the mesh. At higher frequence (from about 2MHz) it worked well.
I guess the reason of it is the skin effect, beacause the skin depth at e.g. 90kHz is 0.22mm, which is bigger than the coil section depth(70um) but smaller than its length(1mm). Is it the reason why the simulation do not converge? And if so, how could I fix it to get the simulation result in low frequence domain? Thanks for your help!
Best regards
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Thomas,
it helps to give the air domain a small conductivity like 1 S/m, maybe even lower works too.
Cheers Edgar
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
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Thomas,
it helps to give the air domain a small conductivity like 1 S/m, maybe even lower works too.
Cheers Edgar
Edgar,
thank you so much, it really helped! Worked well even at 1e-9S/m for simple geometry and the conductivity has to be greater like about 0.1S/m or 1S/m if the geometry is more complex. But it still makes a remarkable difference with the conductivity of the copper. Thanks for your help!
Best Regards Thomas