whitney av harmonic convergence problem.

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JG95130
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Joined: 17 Jul 2015, 00:46
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whitney av harmonic convergence problem.

Post by JG95130 »

Hi,

I am not completely new in the use of elmer but I am relatively new in the use of the electromagnetic module.
I was wondering to evaluate the magnetic flux density field emitted by current sources of different phases. So I tried to use the whitney harmonic solver 3d in simple configuration ( first a straight copper wire to compute a Biot Savard repartition of the magnetic flux density field) and I was unable to get the convergence till I change in the “Body Force 1”
Current Density re 1 = Equals Volume current 1
Current Density re 2 = Equals Volume current 2
Current Density re 3 = Equals Volume current 3

to
Current Density im 1 = Equals Volume current 1
Current Density im 2 = Equals Volume current 2
Current Density im 3 = Equals Volume current 3.

I took the “mgdyn_torus_harmonic\case.sif” where

Body Force 1
Name = "Current"

Current Density im 1 = Variable coordinate
Real MATC "-0.32e5*tx(2)"

Current Density im 3 = Variable coordinate
Real MATC " 0.32e5*tx(0)"
End

And I changed to
Body Force 1
Name = "Current"

Current Density re 1 = Variable coordinate
Real MATC "-0.32e5*tx(2)"

Current Density re 3 = Variable coordinate
Real MATC " 0.32e5*tx(0)"
End

Then the solver output is “solution trivially zero”.
I m using a version 7.0 on windows, I also tired with an older version 6.2 on CAELINUX.

I was expecting more or less the same kind of convergence changing the source term from imaginary to real part. "Solution trivially zero" looks like if there were no source terms.
Is there something I missed.


Best Regards
raback
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Re: whitney av harmonic convergence problem.

Post by raback »

Hi

My guess is that whereas the imaginary part has the suffix "im" the real part is bare and does not have the suffix "re". Hence you don't have a source term in your equation.

-Peter
JG95130
Posts: 2
Joined: 17 Jul 2015, 00:46
Antispam: Yes

Re: whitney av harmonic convergence problem.

Post by JG95130 »

Thank you very much.
It works fine now.

Best Regards.

JG
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