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Lorentz force and moving mesh
Posted Jan 25, 2017, 3:51 p.m. EST Low-Frequency Electromagnetics, Mesh Version 5.2a 1 Reply
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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?
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 Jan 26, 2017, 11:42 a.m. EST
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Posted:
7 years ago
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
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