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positive_column_1d example ...

Posted Jan 31, 2012, 1:11 a.m. EST Plasma Physics 1 Reply

Mona Ghassemi
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Hi,

In positive_column_1d example in Plasma Module :

I receive the following error massage, when I increase applied voltage V0 from 100 V to e.g 1000 V :

Repeated error test failures. May have reached a singularity.
Time : 4.778827037879742e-006
Last time step is not converged.

This massage also occurs for other examples.
How one can resolve this difficulty ?

In my work, I need to increase the voltage to several kV and e.g. 20 microsecond.

Thanks a lot for your kind attention in advance.

Kind Regards,
Mona
1 Reply Last Post Jan 20, 2014, 12:46 a.m. EST
COMSOL Moderator

Hello Mona Ghassemi

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Lukas Alberts
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Posted: 1 decade ago Jan 20, 2014, 12:46 a.m. EST
some of the cross sections are only defined up to 30eV e-temperatures.. (the townsend coeff.)
could that be a source of errors?
some of the cross sections are only defined up to 30eV e-temperatures.. (the townsend coeff.) could that be a source of errors?

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