Elmer Discussion Forum

Regarding your plot along a line. The results data are only at the nodes, so when you do a line through the model the data is close to some nodes but farther away from others. This would impact the plot. Finer mesh would help. You can also build the mesh such that there is a line of nodes along wher...

Depending on how the mesh gets saved out of gmsh (all elements or just grouped elements) , elmer makes each group a body, but any solid elements not grouped are sent to the additional group/body of everything not grouped. However, there are flags in gmsh to save all, or just save groups.

https://www.nic.funet.fi/pub/sci/physics/elmer/doc/GetStartedElmer.pdf This document particularly chapter 9.3 on Elmer and gmsh. Basically the volume of the thing wrapped in air has to be cut from the volume representing the air, and the solid representing the thing is included back (fragments in gm...

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...