Elmer Discussion Forum

You use many of the default constants on Elmer and Elmer materials these are in SI units therefore the physical dimensions are to be in meters. Your geometry looked very large so I threw in a scale factor of 0.001, but I do not know if that is correct. Having the wrong dimensions could cause diverge...

In the manual page 171 there is a solver flag
Desired Coil Current
https://www.nic.funet.fi/pub/sci/physic ... Manual.pdf
So you could take off the body force and use Desired Coil Current
See test case
https://github.com/ElmerCSC/elmerfem/tr ... oilSolver1

In 3d groups of solid elements become bodies, groups of plate elements become boundary surfaces. 1D elements are eliminated if you use -autoclean. ElmerGUI uses -autoclean by default.

In 2D models groups of plate elements become bodies, groups of 1D elements become boundaries.

Void in the plate on the left side, right side no void.

This was my attempt, with and without the magnets. Without the magnets and no need for contact, the rotor deforms as expected.
with magnets on the left, without on the right
on the left it appears to deflect inward instead of outward as expected. The white is undeformed

Sphere for the air is better, 1 infinity boundary, and the BC is written for the spherical case.
Electric Infinity BC Logical
The spherical approximation for the open boundaries extending to infinity.

These are the names of the bodies and boundaries in your mesh ! ----- names for bodies ----- $ body = 1 $ enclosure = 2 ! ----- names for boundaries ----- $ inlet = 1 $ outlet = 2 $ walls = 3 $ left_face = 4 $ front_face = 5 $ right_face = 6 $ back_face = 7 $ top_face = 8 $ bottom_face = 9 So the BC...

There is a contributed case index on the board, your case would make a great contribution.

The vacuum or air should completely surround the plates so as to have an infinity BC on the outer surface. I prefer a sphere because the outer surface better matches the BC.