how set up an 3d magnetostatic simulation

Numerical methods and mathematical models of Elmer
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teofilBitron
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Joined: 25 Feb 2011, 18:43
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how set up an 3d magnetostatic simulation

Post by teofilBitron »

Hello Elmer users,
I have some questions in order to understoode better the set up for Magnetostatic simulation:

1) is it possible to define material non linear permeability like:
Material 3
Name = FeDC05

Electric Conductivity = 9.96e6
Relative Permeability = Variable "Magnetic Flux Density"
Real
0 1760.096312
0.442 1758.662121
0.85 1623.38042
1.117 1062.359245
1.272 616.7254045
1.36 350.1408748
1.409 185.6807669
1.441 134.0252152
1.467 103.450713
1.489 87.5352187
1.591 36.89500953
1.7 24.78269828
1.81236 14.15348831
2.01004 9.618706197
2.13316 4.150970973
2.19999 1.970967265
2.25479 1.593660741
2.29993 1.298226229
2.34251 1.222017
2.37876 1.035012502
2.41501 1.035012502
2.45126 1.035012502
2.4875 1.034689857
2.52375 1.035012502
2.56 1.035012502
End
End

2) which kind of BC have to be imposed to the far filed boundary? Is it right write somthing like:
Boundary Condition 1
Target Boundaries = 2
Name = farField"

P {e} = Real 0
End
Are there some other BCs to apply in order to have a good set up for model?

3) body load like a current in a coil: is it possible to define something like:
Body Force 1
Name = "BodyForce 1"
Current Density 1 = Variable coordinate
Real MATC "-2.04E+07*tx(1)/sqrt(tx(0)*tx(0)+tx(1)*tx(1))"
Current Density 2 = Variable coordinate
Real MATC "2.04E+07*tx(0)/sqrt(tx(0)*tx(0)+tx(1)*tx(1))"
Current Density 3 = 0
End
In this case, I have the coil centered in the origin and placed along the z axis. I used the term "...*tx(1)/sqrt(tx(0)*tx(0)+tx(1)*tx(1))" in order to normalized the value 2.04E+07. This value is a current per unit of volume? If yes, is it corret to make this computation: I have 1000 turns with a current of 10A. The coil volume is 0.49 dm^3, so I have a current density of 1000 * 10 / 0.49e-3 = 2.04e7

4) what are the best suited solutor to use?

5) are there some limitations in the kind of element utilized? Is it possible to use hybrid mesh?

Regards, ALex
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