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

Posted 8 mar 2011, 08:12 GMT-5 Low-Frequency Electromagnetics, Fluid & Heat Version 4.0a, Version 4.2 6 Replies

Behrooz Rezaeealam
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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 set 2014, 04:18 GMT-4
COMSOL Moderator

Hello Behrooz Rezaeealam

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Tyler
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Posted: 1 decade ago 31 mag 2011, 13:59 GMT-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
Marjan
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Posted: 1 decade ago 17 ott 2011, 08:56 GMT-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
Santhosh Reddy
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Posted: 1 decade ago 7 nov 2011, 11:32 GMT-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!.
Amir Fadel
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Posted: 1 decade ago 7 nov 2011, 11:35 GMT-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
Santhosh Reddy
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Posted: 1 decade ago 7 nov 2011, 12:37 GMT-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.
Ivelin Lyahtov
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Posted: 1 decade ago 23 set 2014, 04:18 GMT-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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