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Anisotropic permeability

Posted Dec 27, 2017, 11:38 p.m. EST Electromagnetics, Low-Frequency Electromagnetics Version 5.2a 2 Replies

H Jasper
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Hi,

I want to simulate a simple model of a copper wire with dc current, and I want to look how the magnetic field looks like in the wire when the perneability is anisotropic such as mu_x=1; mu_y=2; mu_z=1. The model I used was 2D with a small circle for the cross section of the wire and a much bigger circle for the air section. The results seems odd because the B seems like anisotropic(an ellipse) while the H is also anisotropic.

And I tried to do the same thing in Ansoft and it turned out different results: The H is still anisotropic but B is isotropic (a perfect circle in other words).

I think there should be only one correct result if all the modeling steps were the same, so which one is wrong?

Thank you

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2 Replies Last Post Dec 28, 2017, 8:52 p.m. EST
Edgar J. Kaiser Certified Consultant
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Posted: 7 years ago Dec 28, 2017, 11:02 a.m. EST

Well, anisotropic permeability should result in anisotropic fields, shouldn't it?

Cheers Edgar

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Well, anisotropic permeability should result in anisotropic fields, shouldn't it? Cheers Edgar
H Jasper
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Posted: 7 years ago Dec 28, 2017, 8:52 p.m. EST

Hi,

Thank you for your reply, it makes sense that anisotropic permeability results in anisotropic fields, but should both the fields B and H (normB and normH in comsol) be anisotropic?

Meanwhile, I can not understand why the results of Comsol and Ansoft are different, there must be one wrong.

I added my results as a picture below my post.

Thanks again

Hi, Thank you for your reply, it makes sense that anisotropic permeability results in anisotropic fields, but should both the fields B and H (normB and normH in comsol) be anisotropic? Meanwhile, I can not understand why the results of Comsol and Ansoft are different, there must be one wrong. I added my results as a picture below my post. Thanks again

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