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MFNC - External Magnetic Flux Density (EMFD)
Posted 9 mai 2022, 08:39 UTC−4 Low-Frequency Electromagnetics Version 5.6 2 Replies
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Hi All,
I do have a question regarding the External Magnetic Flux Density condition...
I am studying how the background magnetic field is affected by a dipole moment. However, when I compute the solution I get a random/alterated background magnetic field (arrows pointing to random directions, not uniformly). To 'fixed' that I use the EMFD condition and the field now points to the given direction (Z direction in my case). I understand this condition forces the background magnetic field change to be zero, therefore, you will not see any changes on the field. My point is that I do want to study the changes/perturbation that the dipole causes on the background field but with the EMFD condition changes are zero and without it I get a extremely perturbed magnetic field at all the domain. Any advices here. Thanks
Image attach is a COMSOL example from their website without the EMFD condition. See the random field even though the input field is only at Z direction
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Hi,
something must be wrong in your model. In a proper setup you would see the dipole field. You don't need a background field.
Cheers Edgar
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
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Hi Edgard,
The reason I applied the background reduced magnetic field is becasuse I want to observe its effect on the dipole field. I did apply an External Magnetic Flux boudary because I wanted the background field to be on the direction I wanted but without the field it just behave randomly. Thanks