Posted:
5 years ago
Mar 14, 2013, 4:06 AM EDT

Hi

A challenging problem ;)

but if your signal is periodic, will it not be simpler to consider a frequency domain solver, you then define the amplitude and phase per coil sets ?

--

Good luck

Ivar

Hi
A challenging problem ;)
but if your signal is periodic, will it not be simpler to consider a frequency domain solver, you then define the amplitude and phase per coil sets ?
--
Good luck
Ivar

Posted:
5 years ago
Mar 14, 2013, 9:12 AM EDT

Thanks Ivar for your reply.

For now I have decided to use current density under Magnetic Fields physics, but there are some parameters I do not understand how they work:

Click on the Magnetic Fields(mf) on its window

a) I would like to know whether the thickness, d represents the depth of my model

b) By right-clicking the Magnetic Fields there is an option of Change Thickness(Out-of-Plane).

Can I use this to change the thickness of any domain in my model?

And if yes do I have to assign any boundary conditions at the interface with the rest of the models?

In addition is it centered, i.e. assuming my origin is (0,0,0), and my model is 20mm thick, lets assume I use the Change Thickness provision for a given domain and change it to 10mm, will the thickness be -5 to 5 with respect to the origin?

Regards

Wanjiku

Thanks Ivar for your reply.
For now I have decided to use current density under Magnetic Fields physics, but there are some parameters I do not understand how they work:
Click on the Magnetic Fields(mf) on its window
a) I would like to know whether the thickness, d represents the depth of my model
b) By right-clicking the Magnetic Fields there is an option of Change Thickness(Out-of-Plane).
Can I use this to change the thickness of any domain in my model?
And if yes do I have to assign any boundary conditions at the interface with the rest of the models?
In addition is it centered, i.e. assuming my origin is (0,0,0), and my model is 20mm thick, lets assume I use the Change Thickness provision for a given domain and change it to 10mm, will the thickness be -5 to 5 with respect to the origin?
Regards
Wanjiku

Posted:
5 years ago
Mar 14, 2013, 9:25 AM EDT

Hi

I understand you are in 2D, then the Z value is by default normally 1[m] (out of plane thickness = mf.d

But you can change some domains "Change thickness node"

Reminder, 2D means no gradients along Z hence no estimation of losses in Z direction neither, normally it's all PER meter depth.

A difference in depth does not take into account any coupling w.r.t. the difference of depth, it's only used for absolute calculations when integration on the "volume" is required (from my understanding, but there might eb exceptions, always check you understand well the COMSOL internal variables ;)

But 2D soles much quicker than 3D so it's worth the simplifications ;)

--

Good luck

Ivar

Hi
I understand you are in 2D, then the Z value is by default normally 1[m] (out of plane thickness = mf.d
But you can change some domains "Change thickness node"
Reminder, 2D means no gradients along Z hence no estimation of losses in Z direction neither, normally it's all PER meter depth.
A difference in depth does not take into account any coupling w.r.t. the difference of depth, it's only used for absolute calculations when integration on the "volume" is required (from my understanding, but there might eb exceptions, always check you understand well the COMSOL internal variables ;)
But 2D soles much quicker than 3D so it's worth the simplifications ;)
--
Good luck
Ivar

Posted:
5 years ago
Mar 14, 2013, 9:55 AM EDT

Hello,

I decided to try 2D first and if things work, I will proceed with 3D.

So there will be no effect in the distribution of magnetic field between the thick and the thin regions - I expect high flux-density in the thin regions. The solvers for MF are PDEs, and according to your statement below and assuming it is acting on 2D surfaces, i.e over areas not volumes, I assume it won't have any implication in my flux-density distribution irrespective of whether I change the thickness of a given domain using the Change Thickness node.

"A difference in depth does not take into account any coupling w.r.t. the difference of depth, it's only used for absolute calculations when integration on the "volume" is required"

I thought its a like quasi 3D analysis which would be a brilliant idea :)

Let me keep on trying I will get somewhere

Regards

Wanjiku

Hello,
I decided to try 2D first and if things work, I will proceed with 3D.
So there will be no effect in the distribution of magnetic field between the thick and the thin regions - I expect high flux-density in the thin regions. The solvers for MF are PDEs, and according to your statement below and assuming it is acting on 2D surfaces, i.e over areas not volumes, I assume it won't have any implication in my flux-density distribution irrespective of whether I change the thickness of a given domain using the Change Thickness node.
"A difference in depth does not take into account any coupling w.r.t. the difference of depth, it's only used for absolute calculations when integration on the "volume" is required"
I thought its a like quasi 3D analysis which would be a brilliant idea :)
Let me keep on trying I will get somewhere
Regards
Wanjiku

Posted:
5 years ago
Mar 14, 2013, 2:32 PM EDT

Hi

Check the equation and see where "d" is used, and do a few test cases, then you will rapidly get a good feeling where the depth is important and where it can be ignored

--

Good luck

Ivar

Hi
Check the equation and see where "d" is used, and do a few test cases, then you will rapidly get a good feeling where the depth is important and where it can be ignored
--
Good luck
Ivar