Non-Linear Magnetic Material - Forced Mu_R

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Hi,

Relatively new to COMSOL, did try and Google this and used GPT but still haven't found a work around.

I'm modeling a cylindrical solenoid and a cylindrical piece of iron (custom BH curve) and trying to do a force calculation. I used the default Soft Iron material and updated with custom BH curve.

When I set this up, it forces me to input a constant mu_r value (from Amepere's law), even though it has a specified non-linear magnetic property.

I set this to 100, hoping that it was just a dummy input, however whenever I play around with this value, it is very clear that COMSOL is just using this value, not the BH curve. Can say that with certainty, as if I set this mu_r to 1, B is approximately 0.1T and if I set mu_r to 100, B is approximately 3T, which is well above the custom BH curve (Saturation 2T).

If anyone has any advice on how I can bypass the forced mu_r input, or a way of properly overriding this with the given BH curve that would be great. Model attached.

If you have any questions please let me know.

Many Thanks in Advance



3 Replies Last Post 2024年8月25日 GMT+2 18:18
Edgar J. Kaiser Certified Consultant

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Posted: 3 days ago 2024年8月23日 GMT+2 16:20

You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation.

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation.

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Posted: 2 days ago 2024年8月24日 GMT+2 18:40

You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation.

i got a similar issue but this didnt rly work out for me

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vendor at gamer-choice.com/
>You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation. i got a similar issue but this didnt rly work out for me

Dave Greve Certified Consultant

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Posted: 1 day ago 2024年8月25日 GMT+2 18:18

You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation.

i got a similar issue but this didnt rly work out for me

You'll have to post your model then to get advice.

I have done exactly what Edgar suggests and it works perfectly. (although it is certainly possible to define a B-H curve that does not easily converge).

>>You need to add an Ampere's law node for the nonlinear domain with the BH constitutive relation. > >i got a similar issue but this didnt rly work out for me You'll have to post your model then to get advice. I have done exactly what Edgar suggests and it works perfectly. (although it is certainly possible to define a B-H curve that does not easily converge).

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