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Ill-conditioned preconditioner.

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Hello,
I started working with this software a few days ago, I have watched and read many tutorials. I am now simulating an oversimplified version of another project but when I try to compute the solution I always get the same error
"Ill-conditioned preconditioner Increase factor in error estimate to... " I am not sure what I am doing wrong since its a very simple geometry and very simple conjugate heat transfer problem.

Help on this will be kindly appreciated.
thank you


2 Replies Last Post 18.06.2012, 09:23 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 14.06.2012, 11:17 GMT-4
Hi

if I were you, I would remove the Heat transfer in Fluid module (delete), then switch the main NITF node from heat transfer in solid to heat transfer in fluid (as master model), then add a Domain Heat transfer in Solid node and select your solid "2"

Then use a normal or finer mesh

--
Good luck
Ivar
Hi if I were you, I would remove the Heat transfer in Fluid module (delete), then switch the main NITF node from heat transfer in solid to heat transfer in fluid (as master model), then add a Domain Heat transfer in Solid node and select your solid "2" Then use a normal or finer mesh -- Good luck Ivar

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Posted: 1 decade ago 18.06.2012, 09:23 GMT-4
Thank you very much.
Thank you very much.

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