Elmer Discussion Forum

The far field boundaries specify the tangential components of the magnetic field H = (1/μ)B and the normal component of current density J = σE′. Your model is in cartesian so the farfield is rotated to the coordinate system. Because of this often you will see the far field as a sphere not a cube. Th...

Elmer may be the only tool. It is certainly the only tool that is open source and free to use. It is definitely the easiest to use and learn,

There are two options. 1. You can set the message level such that you see the result for each iteration and compare it to the convergence criteria. Or if it converges prior to to the max iterations set you know it converged to the criteria. e.g. Elmer out puts 820 0.2350E-06 830 0.2391E-06 840 0.190...

If you do
ElmerGrid 2 2 mesh -autoclean -increase

it works

The problem is the more complex one has not converged. One issue with iterative solvers, is every iteration is a solution, but it might not be a converged solution. By default Elmer moves on when the number of specified iterations has taken place, even if convergence is not reached. If you change to...

When i run the mesh you posted with the sif you posted it looks OK to me What version of Elmer are you running?

You have no BCs at the ends, only a desired coil current specified in the solver. I let the solver calculate the coil current, and specify the potential at each end. ! CoilSolver Solver 1 Exec Solver = Before All Equation = CoilSolver Procedure = "CoilSolver" "CoilSolver" Linear ...

Is it possible to zip and post the mesh?

Are you sure the BCs are at each end of the coil?

It is not required, but is an option. Coil solver saves resources, time, etc. A large coil can be represented with known coil equations.

Or you can model all of the elements and physics, and numerically solve for what the coil equations provide.