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detect flaw with eddy current

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Hi,

I am making a simulation for detecting the full circumferential flaw in one tube. My modeling was built under the magnetic and electric fields. I use two coils. One is the exciter and another is the detector. I use the external current density in the area of exciter. I typed the value of current density(1e6A/m^2) in the blank. But why the current density(mef.Jephi) is changed into twice(2e6A/m^2) as shown in the equation view of the external current density? It is strange.

Attached is my model.

Looking forward to the answer. Thank you!


1 Reply Last Post 18 nov. 2010, 01:30 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 18 nov. 2010, 01:30 UTC−5
Hi

check you version, and take a look at the equations, I suspect a typo inside COMSOL by a factor 2 in MEF for external currents, should be fixed by 4.1 I hope ;)

Workaround: divide your current by 2 in MEF external current load cases, for the time being

--
Good luck
Ivar
Hi check you version, and take a look at the equations, I suspect a typo inside COMSOL by a factor 2 in MEF for external currents, should be fixed by 4.1 I hope ;) Workaround: divide your current by 2 in MEF external current load cases, for the time being -- Good luck Ivar

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