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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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error: may have reached singularity

Posted 2014年5月24日 GMT-4 07:09 Low-Frequency Electromagnetics, Studies & Solvers Version 4.3 2 Replies

Viola Maher
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Hi
what is meant by this error"repeated error test failures, may have reached singularity" and at what place does the error come from? from mesh, geometry, or what? i try to model DC Discharge plasma jet model
2 Replies Last Post 2014年5月24日 GMT-4 23:15
chales
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Posted: 1 decade ago 2014年5月24日 GMT-4 23:12
"Repeated error test failures. May have reached a singularity.
Time : 7.299997707294361e-006 Last time step is not converged."
============================

I have moved the toy electrostatics ES example (circular plate capacitor) over to EC. Warning: zero AIR conductivity will cause bizarre numerical errors in the field system without any warning. Make sigma small but finite!

I apply a step voltage pulse at 4us to terminal. computes OK.
I apply a pulse on at 4us, off at 7us I get the error. Takes 10 minutes to fail.
revert to step voltage computes OK.

I have looked here. I have looked in help. Can't find anything meaningful. I have no clue what to do about it.

thanks
Colin Hales
"Repeated error test failures. May have reached a singularity. Time : 7.299997707294361e-006 Last time step is not converged." ============================ I have moved the toy electrostatics ES example (circular plate capacitor) over to EC. Warning: zero AIR conductivity will cause bizarre numerical errors in the field system without any warning. Make sigma small but finite! I apply a step voltage pulse at 4us to terminal. computes OK. I apply a pulse on at 4us, off at 7us I get the error. Takes 10 minutes to fail. revert to step voltage computes OK. I have looked here. I have looked in help. Can't find anything meaningful. I have no clue what to do about it. thanks Colin Hales
chales
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Posted: 1 decade ago 2014年5月24日 GMT-4 23:15
.MPH file is attached.
Meshes and solutions stripped)

.MPH file is attached. Meshes and solutions stripped)

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