### Boundary conditions for 3D WhitneyAVHarmonicSolver

Posted:

**13 Jun 2017, 10:47**Hi,

I am trying to solve inductor in the air, see picture attached.

Inductor is made from highly conductive material and frequencies are about 1kHz so skin effect should be taken in account. Lets say I have 1kA current flowing in the inductor.

I see two options to model this:

1) Set appriximate current distribution as a analytic function.

2) Set guessed potential to inductor's terminals. Then in postprocessing integrate and compute resulting current, and scale potential to match that specified 1kA current.

Q1: Is there a better way to do this?

Q2: What boundary condition is the most appropriate on YZ plane where terminals are located and the outer airbox?

I triedBC's from

Thanks!

I am trying to solve inductor in the air, see picture attached.

Inductor is made from highly conductive material and frequencies are about 1kHz so skin effect should be taken in account. Lets say I have 1kA current flowing in the inductor.

I see two options to model this:

1) Set appriximate current distribution as a analytic function.

2) Set guessed potential to inductor's terminals. Then in postprocessing integrate and compute resulting current, and scale potential to match that specified 1kA current.

Q1: Is there a better way to do this?

Q2: What boundary condition is the most appropriate on YZ plane where terminals are located and the outer airbox?

I triedBC's from

**mgdyn_harmonic_wire**(see code below), but I lack physical interpretation whether these BC's are correct.Thanks!

Code: Select all

```
Boundary Condition 1
Name = "terminal1"
Target Boundaries(1) = 1
Coil Start = Logical True
AV re {e} 2 = Real 0.0
AV re {e} 3 = Real 0.0
AV re = Real 0.0
AV im {e} 3 = Real 0.0
AV im {e} 4 = Real 0.0
AV im = Real 0.0
End
Boundary Condition 2
Name = "terminal2"
Target Boundaries(1) = 2
Coil End = Logical True
AV re {e} 2 = Real 0.0
AV re {e} 3 = Real 0.0
AV re = Real 1
AV im {e} 2 = Real 0.0
AV im {e} 3 = Real 0.0
AV im = Real 0.0
End
Boundary Condition 3
Name = "terminalPlane"
Target Boundaries(1) = 3
AV re {e} 2 = Real 0.0
AV re {e} 3 = Real 0.0
AV im {e} 2 = Real 0.0
AV im {e} 3 = Real 0.0
Boundary Condition 4
Name = "remainingAirBox"
Target Boundaries(1) = 4
AV re {e} = Real 0.0
AV im {e} = Real 0.0
End
```