Hello,
I am trying to calculate the magnetic flux density in an air gap with a two coil setup. But despite everything I tried (mostly looked up in this forum), I can't get a converging solution:
I tried to simplify the geometry to get the thing running.
I tried several preconditioners - "diagonal", ILU(1), ILU(2), "None" (from Models Manual) as well as iterative solvers BiCGStab and BiCGStab(L).
I switched from CoilSolver based current density to an analytical function (MATC).
I limited the Body Force/Current Density to a single coil.
The mesh was generated with NetGen 5.3 and the solver input file with ElmerGUI. I cannot find any mistake in the sif file, but still it does not converge. Any ideas what goes wrong with it?
WhitneyAVSolver does not converge despite all effort
WhitneyAVSolver does not converge despite all effort
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Best Regards
Georg
Best Regards
Georg
Re: WhitneyAVSolver does not converge despite all effort
Hi,
I do not use the MgDyn solver myself. However, I quickly tried to run your case. I see divergence as well. Your geometry seems quite large to me, it has a diameter of 4000 length units. Elmer assumes m by default, so this would be 4 km. If you want to scale the length units to mm, you can say
Coordinate Scaling = 0.001
in the simulation section (free text field in Model>Setup). That does not cure the divergence however, so there must be something else. Maybe you can try to start with a tutorial or a case which is veery simple in order to get something to run. Sorry that I cannot help further as I do not know this solver well enough...
Matthias
I do not use the MgDyn solver myself. However, I quickly tried to run your case. I see divergence as well. Your geometry seems quite large to me, it has a diameter of 4000 length units. Elmer assumes m by default, so this would be 4 km. If you want to scale the length units to mm, you can say
Coordinate Scaling = 0.001
in the simulation section (free text field in Model>Setup). That does not cure the divergence however, so there must be something else. Maybe you can try to start with a tutorial or a case which is veery simple in order to get something to run. Sorry that I cannot help further as I do not know this solver well enough...
Matthias