magnetostatic with mesh morphing

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magnetostatic with mesh morphing

Postby teofilBitron » 03 Feb 2017, 18:33

In this little example I'll resolve the magnetic field around an horseshoe permanent magnet.
Interesting, in my opinion, are the way in which the magnetization Body force is given and the mesh update in order to fast evaluate different iron position between the magnet and the ferromagnetic bar.

The mesh zip is 2.4Mb and I can not upload it.

My question is, are there a way in order to evaluate the magnetic force between the magnet and the iron bar?

Many thanks in advance, Alex
Attachments
permanentMagnet.jpg
permanentMagnet.jpg (35.88 KiB) Viewed 907 times
ferroCavallo.zip
(955.53 KiB) Downloaded 66 times
teofilBitron
 
Posts: 41
Joined: 25 Feb 2011, 18:43
Location: Italy

Re: magnetostatic with mesh morphing

Postby kataja » 03 Feb 2017, 19:34

This looks quite nice!

The cleanest way to have total magnetic forces calculated per group of bodies is to utilize the component sections and nodal forces.

For that you need to have section like this
Code: Select all
Component 1
  master bodies(n) = k_1 k_2 ... k_n ! the id numbers of the bodies where the forces are collected
  calculate magnetic force = logical true
End


This will collect the total magnetic force acting on bodies k_1, k_2, ... k_n.

Also, you need to have
Code: Select all
calculate nodal forces = true
in the MagnetoDynamicsCalcFields solver and, if you want to have the component results saved to a file,
Code: Select all
save component results = true
in the SaveScalars solver.

There is an example in elmer tests where you can see more here: https://github.com/ElmerCSC/elmerfem/blob/devel/fem/tests/mgdyn_airgap_force/case.sif

By the way, may we (as CSC - Finnish IT Center for Science) use your example in our Elmer materials?

Cheers,
Juhani
kataja
 
Posts: 57
Joined: 09 May 2014, 16:06

Re: magnetostatic with mesh morphing

Postby teofilBitron » 04 Feb 2017, 12:29

Thank you for your replay. On Next Monday I'll try it. Obviously, I Think that coluld also be possible to use those Forces as loads for a subsequent structural analysis.
In order to share the case, how could I upload the mesh that is great than the size limit?
teofilBitron
 
Posts: 41
Joined: 25 Feb 2011, 18:43
Location: Italy


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