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Lorentz force and moving mesh

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As shown in the EM plunger example (www.comsol.com/model/electromagnetic-plunger-36671), Lorentz forces on translating objects can be modeled in Comsol with moving mesh nodes. However, the plunger example is for a time-dependent study, and it seems that prescribed mesh velocity nodes cannot be employed in stationary studies.

The system I would like to model is very similar to Comsol's homopolar generator example, except that the spinning disk in question has a constant translational velocity. Is it possible to model a magnetic field + constant linear velocity with a Lorentz node in a stationary study? The Lorentz node certainly accepts constant linear terms, but the documentation for Lorentz nodes suggests that such a simulation may not produce physically valid results. That is, one can simulate a linear+rotational velocity in a Lorentz node, but is the result right?

1 Reply Last Post 26.01.2017, 11:42 GMT-5
Nirmal Paudel Tribhuvan University/Electrical Engineering

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Posted: 8 years ago 26.01.2017, 11:42 GMT-5
Hi Christian,

Yes, it is possible to have a Lorentz term to model the linear motion within the Magnetic Fields physics. See the following example.
www.comsol.com/model/electrodynamic-wheel-magnetic-levitation-in-2d-44871

Keep in mind that the moving object has to be extended infinitely. This is true for the falling magnet example as well. www.comsol.com/model/magnet-falling-through-copper-tube-13875

Hope this helps.

Best Regards,
Nirmal
Hi Christian, Yes, it is possible to have a Lorentz term to model the linear motion within the Magnetic Fields physics. See the following example. https://www.comsol.com/model/electrodynamic-wheel-magnetic-levitation-in-2d-44871 Keep in mind that the moving object has to be extended infinitely. This is true for the falling magnet example as well. https://www.comsol.com/model/magnet-falling-through-copper-tube-13875 Hope this helps. Best Regards, Nirmal

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