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Ill-conditioned preconditioner. Increase factor in error estimate to 18704635135.61623

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Hello

when i run my model, it gives me the solution, however i receive a warning too:
"Ill-conditioned preconditioner. Increase factor in error estimate to 18704635135.61623"
i would be grateful if anybody explain what it means.

Behrooz

6 Replies Last Post 23 sept. 2014, 04:18 UTC−4
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Hello Behrooz Rezaeealam

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Posted: 1 decade ago 31 mai 2011, 13:59 UTC−4
I'm also interested if any one has advice on this particular Warning
TT
I'm also interested if any one has advice on this particular Warning TT

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Posted: 1 decade ago 17 oct. 2011, 08:56 UTC−4
Hi,

I also get such an error . In fact I am following a comsol example. In my case it is backstep laminar flow. It is strange. The results are exactly like what is expected as are shown in pdf model in the liberary but I get this error messege as well. Did you figure it out where it comes from?

Yours,
Marjan
Hi, I also get such an error . In fact I am following a comsol example. In my case it is backstep laminar flow. It is strange. The results are exactly like what is expected as are shown in pdf model in the liberary but I get this error messege as well. Did you figure it out where it comes from? Yours, Marjan

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Posted: 1 decade ago 7 nov. 2011, 11:32 UTC−5
Nobody has answer for this question?. I also got same error when solving laminar flow in a tube!.
Nobody has answer for this question?. I also got same error when solving laminar flow in a tube!.

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Posted: 1 decade ago 7 nov. 2011, 11:35 UTC−5
Hi,

It may due to the scaling of your variables, cehck the results and see whether imposing a Manual scaling value similar to the results you still get the error message.


Cheers
Hi, It may due to the scaling of your variables, cehck the results and see whether imposing a Manual scaling value similar to the results you still get the error message. Cheers

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Posted: 1 decade ago 7 nov. 2011, 12:37 UTC−5
Hi Amir,
Thanks for your reply. I get around that issue by changing the initial condition (instead of default value 0) to inlet velocity.
Hi Amir, Thanks for your reply. I get around that issue by changing the initial condition (instead of default value 0) to inlet velocity.

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Posted: 1 decade ago 23 sept. 2014, 04:18 UTC−4
Hey,

I'm new to comsol and I get the same warning. Please point out how you fixed this problem! Thanks in advance!

Regards,

Ivelin
Hey, I'm new to comsol and I get the same warning. Please point out how you fixed this problem! Thanks in advance! Regards, Ivelin

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