Problem with Large domain

Topics: 4.3b, RF Module

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Kapil Debnath

Kapil Debnath

June 27, 2013 11:36am UTC

Problem with Large domain

Hi

I am simulating propagation through a simple waveguide in 3D.
The simulation is working perfectly as long as the length of the waveguide is below 10um. When I increase the device length to 10um, the simulation continues and reaches the convergence, however at the final step an error message appears. as below.

Failed to find a solution.
Very ill-conditioned preconditioner.
The relative residual is more than 1000 times larger than the relative tolerance.
Returned solution is not converged.

I have attached the file. I would appreciate any suggestions.

Thank you

Kapil

Attachments:   Ribwaveguide10um.mph  

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Mohammed Thameemul Ansari

Mohammed Thameemul Ansari

February 9, 2015 2:40am UTC in response to Kapil Debnath

Re: Problem with Large domain

Hello sir

The same error am facing now. Did you fix the problem?

May i know what is the solution for the problem?

The relative residual is more than 1000 times larger than the relative tolerance.
Returned solution is not converged.

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Walter Frei

Walter Frei
COMSOL Employee
USA
Moderator

February 12, 2015 2:40pm UTC in response to Kapil Debnath

Re: Problem with Large domain

Dear Kapil,

You may want to check the geometric scales here. You would want units of microns, not meters.

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