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Electromagnetic forces on parallel current-carrying wires - Comsol example

Posted Mar 7, 2013, 3:58 p.m. EST Low-Frequency Electromagnetics, Studies & Solvers Version 4.3 6 Replies

Jozef Kvitkovic
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Dear all,
I suppose that Comsol example: Electromagnetic forces on parallel current-carrying wires in ACDC_Module/Verification_Models/parallel_wires should be fully and properly working example.
I tried to change currents in wires in Parameters section from 1A to 10, and 100 A and after that I observed that the calculated force was not changed.
Is something else I need to change? Am I doing some mistake?
Comsol version is 4.3.
Thank you in advance,
Jozef.
6 Replies Last Post Mar 7, 2013, 5:25 p.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 7, 2013, 4:08 p.m. EST
Hi

obviously yes something is not OK, as you should see the force increase ;) but normally, if set up corectly, the change in current it all was is required

--
Good luck
Ivar
Hi obviously yes something is not OK, as you should see the force increase ;) but normally, if set up corectly, the change in current it all was is required -- Good luck Ivar
Edgar Kaiser
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Posted: 1 decade ago Mar 7, 2013, 4:10 p.m. EST
Jozef,

you must go to the node 'Derived Values' and re-evaluate both subnodes.
Then you see an increase of forces by a factor 100 after an increase of current by a factor of 10. That is how it should be.

Cheers
Edgar
Jozef, you must go to the node 'Derived Values' and re-evaluate both subnodes. Then you see an increase of forces by a factor 100 after an increase of current by a factor of 10. That is how it should be. Cheers Edgar
Jozef Kvitkovic
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Posted: 1 decade ago Mar 7, 2013, 4:17 p.m. EST
Thank you Ivar, but I need more concrete answer. Jozef.
Thank you Ivar, but I need more concrete answer. Jozef.
Jozef Kvitkovic
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Posted: 1 decade ago Mar 7, 2013, 4:32 p.m. EST
Thank you Edgar, now it is working. Jozef.
Thank you Edgar, now it is working. Jozef.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 7, 2013, 5:18 p.m. EST
Hi

It's true that the derived variables nodes are not updated automatically, you need to do it manually ;)

--
Good luck
Ivar
Hi It's true that the derived variables nodes are not updated automatically, you need to do it manually ;) -- Good luck Ivar
Jozef Kvitkovic
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Posted: 1 decade ago Mar 7, 2013, 5:25 p.m. EST
Thank you Ivar.
Jozef.
Thank you Ivar. Jozef.

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