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Difference between normJ and Jphi
Posted Jul 31, 2012, 4:01 a.m. EDT Low-Frequency Electromagnetics, Results & Visualization Version 4.3 1 Reply
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Hello,
in a 2D AC/DC (MF, axisymmetric) study I inetegrat over a coil surrface. (The coil is current driven. I use single turn coil).
When I inegrate over normJ the value ist wrong (not the same I put in the coil)
When I inegrate over Jphi the value is right.
My question: What is the reason for?
Greets
André Dietrich
in a 2D AC/DC (MF, axisymmetric) study I inetegrat over a coil surrface. (The coil is current driven. I use single turn coil).
When I inegrate over normJ the value ist wrong (not the same I put in the coil)
When I inegrate over Jphi the value is right.
My question: What is the reason for?
Greets
André Dietrich
1 Reply Last Post Aug 2, 2012, 1:38 p.m. EDT
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Posted:
1 decade ago
Hi
Have you checked the Comsol equation of normJ, and tried a plot of the components ?
Normally, in 2D axi the external current is defined as normal to the paper hence its a pure Jphi, as the norm from my understanding includesalso Jr and Jz too, hence gives potentially a different result.
But as I'm not by my Comsol WS so I cannot check it out myself and one should always carefully check such issues on a simple model where one can write out the results analytically
--
Good luck
Ivar
Have you checked the Comsol equation of normJ, and tried a plot of the components ?
Normally, in 2D axi the external current is defined as normal to the paper hence its a pure Jphi, as the norm from my understanding includesalso Jr and Jz too, hence gives potentially a different result.
But as I'm not by my Comsol WS so I cannot check it out myself and one should always carefully check such issues on a simple model where one can write out the results analytically
--
Good luck
Ivar