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Confusing Error Message

Posted Jul 12, 2018, 8:15 p.m. EDT Electromagnetics, Low-Frequency Electromagnetics, Studies & Solvers Version 5.3 2 Replies

Henry Froland
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Hi All,

I've been working for a bit on a model of a detector using the mf interface from the AC/DC module, but have realized that I muight reformulate the problem using the mef interface (mf doesn't connect to a circuit how I want). I've set up the model the same way for the mef version as I did for mf, and am trying to run it in both stationary and frequency domain studies. However, I get the following error message:

  • Feature: Stationary Solver 1 (sol2/s1) Failed to find a solution. The relative residual (1.1e+011) is greater than the relative tolerance. There was a warning message from the linear solver. Iterative refinement triggered. Returned solution is not converged.

I've attached the model below and was hoping someone could explain how to fix this. It's a pretty simple problem that can be done with pencil and paper, so I suspect that I'm missing some simple technical detail about COMSOL that I haven't found in my online searches so far.

Thanks, Henry

Attachments:

2 Replies Last Post Sep 20, 2018, 5:08 p.m. EDT
Nichal Gentilal
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Posted: 6 years ago Jul 17, 2018, 5:03 p.m. EDT

Hi Henry,

Have you tried with a finer mesh? Plus, try change the error tolerance and the solver and see if it helps

Regards, Nichal

Hi Henry, Have you tried with a finer mesh? Plus, try change the error tolerance and the solver and see if it helps Regards, Nichal
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago Sep 20, 2018, 5:08 p.m. EDT

Henry,

the air domain needs a higher conductivity, 1 S/m works. I also changed the direct solver to PARDISO, which frequently converges better.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Henry, the air domain needs a higher conductivity, 1 S/m works. I also changed the direct solver to PARDISO, which frequently converges better. Cheers Edgar

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