Calculate eddy current density from magnetic vector potential

Khanh Tran Vu
Khanh Tran Vu Altair Community Member
edited March 28 in Community Q&A

Hello everyone, I try to check the FEA theory by calculating the current density from magnetic vector potential.
I obtain the magnetic vector potential on each mesh node of the study region (copper, non-magnetic) at 2 time steps in a row and try to calculate the current density according equation [Finite Element Method for Electromagnetic-Stanley Humphries (page 216). However, the result I obtained using equation (11.45) is far from the FEA result from Flux. 
Does anyone have any idea about these results or how to fix them?
I also attached the data in an excel file which includes x,y-coordinates, and magnetic vector potential at two time steps of each mesh nodes.
Thank you so much for reading it.

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Answers

  • plombard
    plombard
    Altair Employee
    edited March 28

    Hi,

    You will find below a workflow to be able to compute current density, by using the way Flux is computing it. These equations are defined for magnet with the [open Circuit] option. First we recall the equations:

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    With Altair Flux, you will need to follow the next steps:

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    Normally by applying this method you should find exactly the same values as Flux for current density in solid conductors with open circuit option. If your conductor is not with open circuit option, then Jz will be equal to the global current crossing your solid conductor.

    I hope it will help

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