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Understanding and fixing the singularity error

Posted Jul 16, 2017, 12:51 a.m. EDT Plasma Physics, Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 5.1 1 Reply

Jessie Frost
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I have been working with microwave plasmas recently. Everything worked perfectly fine until I decided to add a metal contact boundary condition with a sinusoidal current (Asinwt).

Now I get a singularity error no matter what I change or do. The model runs perfectly when the current equals 0. So I think the problem is not with the boundary conditions since I just added the metal contact condition and changed nothing else.

This is the error that I get:

Repeated error test failures. May have reached a singularity
Time : 3.945307058587785e-008
Last time step is not converged.

Sorry, I can't upload the model due to " File extension error".

I have no Idea what I am doing wrong. Any help would be very much appreciated.

Thanks.
1 Reply Last Post Oct 20, 2017, 8:47 a.m. EDT
COMSOL Moderator

Hello Jessie Frost

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Vasily Kozhevnikov
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Posted: 7 years ago Oct 20, 2017, 8:47 a.m. EDT

Hi,

When you receive such error, at first try to adjust "Relative tolerance" parameter from 1e-2 down to 1e-6. Hope it'll help

Hi, When you receive such error, at first try to adjust "Relative tolerance" parameter from 1e-2 down to 1e-6. Hope it'll help

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