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How do i apply Ground in "Magnetic Fields (mf)" physics package?

Posted 25 mar 2022, 07:06 GMT-4 Low-Frequency Electromagnetics, Studies & Solvers Version 5.6 3 Replies

Hendrik Hensel
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Hello together, I want to simulate a coil system in Comsol. I used the "Magnetic and Electric Fields (mef)" physics package and could easily apply a ground boundary there (frequency domain). Now I want to solve the system in time domain, which is only possible in the "Magnetic Fields" physics, but I can't find a ground boundary there. How can I apply it?

3 Replies Last Post 28 mar 2022, 09:29 GMT-4
Edgar J. Kaiser Certified Consultant
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Posted: 2 years ago 25 mar 2022, 07:12 GMT-4

Hendrik,

in mf you cannot apply an electric potential boundary condition, so ground is not an option.

Cheers Edgar

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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hendrik, in mf you cannot apply an electric potential boundary condition, so ground is not an option. Cheers Edgar
Hendrik Hensel
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Posted: 2 years ago 28 mar 2022, 08:52 GMT-4

Hi Edgar,

thank you for the reply. Alright.

I simply want to simulate a piece of conductor with 2 coils around it. I can easily define a current through the coils via the option "coil", but I also want to define a current through the piece of conductor. In the mef-package I could do it with a terminal on one side and ground on the other. Do you know how I can apply a current in the piece of conductor in the mf package?

Thank you and kind regards, Hendrik

Hi Edgar, thank you for the reply. Alright. I simply want to simulate a piece of conductor with 2 coils around it. I can easily define a current through the coils via the option "coil", but I also want to define a current through the piece of conductor. In the mef-package I could do it with a terminal on one side and ground on the other. Do you know how I can apply a current in the piece of conductor in the mf package? Thank you and kind regards, Hendrik
Edgar J. Kaiser Certified Consultant
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Posted: 2 years ago 28 mar 2022, 09:29 GMT-4

Hendrik,

you can use the piece of metal as a coil as well. A coil in Comsol doesn't need to look like a typical helical coil. Also it doesn't need to be a closed loop if you guide the terminal ends to an outside boundary of the model. Check the documentation about the requirements for coils.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hendrik, you can use the piece of metal as a coil as well. A coil in Comsol doesn't need to look like a typical helical coil. Also it doesn't need to be a closed loop if you guide the terminal ends to an outside boundary of the model. Check the documentation about the requirements for coils. Cheers Edgar

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