Stat Current convergence

Numerical methods and mathematical models of Elmer
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sabrina
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Stat Current convergence

Post by sabrina »

Dear all,

I am trying to solve a static current problem with the StatCurrent model in 2D. It is basically a set of electrodes with a given potential and 1 electrode with a floating potential (to let it float I am using the boundary condition explained here: viewtopic.php?f=3&t=6715&p=21080&hilit=floating#p21071 ).

The issue I am facing is that the solution is not nearly close to converging. I tried a couple of different solvers, according to the ElmerSolver manual, but nothing has worked so far. Could somebody please give me a hint on what I am not doing right or what could be improved/tested? You can find the .sif attached and in case someone is interested, the msh file is in this link: https://ikpcloud.ikp.physik.tu-darmstad ... tzWsxfV4kW .

Thank you very much in advance,

Sabrina
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2d_main_double.sif
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raback
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Re: Stat Current convergence

Post by raback »

Hi

Maybe you could share the output.

BR, Peter
sabrina
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Re: Stat Current convergence

Post by sabrina »

Hi Peter, thank you for your reply. Here is the output I get.

Best,
Sabrina
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raback
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Re: Stat Current convergence

Post by raback »

Hi

Indeed, it seems you have classical convergence problems. The constant section for the floating pressure may complicate things.

Do you get good convergence without that section?

How about using "direct" method + MUMPS. Does it fit the memory.

You could choose higher ILU too, ILU2 and ILU3.

-Peter
sabrina
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[SOLVED] Re: Stat Current convergence

Post by sabrina »

Dear Peter,

Thank you for your suggestions. Actually, without the floating element it still didn't converge, but finally using ILU3 solved all the problems!

Best regards,

Sabrina
raback
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Re: Stat Current convergence

Post by raback »

Hi Sabrina,

Maybe you could share the picture. There must be something challenging with the geometry when standard Poisson equation has trouble converging. But great that it was resolved.

-Peter
dSilverEC
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Re: Stat Current convergence

Post by dSilverEC »

exactly the same issue I have now, is there any update ?
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