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Error: Failed to evaluate operator double Jacobian. - Operator: mean

Posted Jun 28, 2011, 5:36 p.m. EDT Fluid & Heat, Heat Transfer & Phase Change Version 3.5a, Version 4.2 2 Replies

Catherine Robin
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Hi all,

I am new to 4.2, and fairly novice to Comsol in general. I am coupling laminar flow (spf) with heat transfer and the moving mesh (ALE), and I keep getting the error above, which I can't locate in any discussion or documentation. I get the same error whether I enable the moving mesh or not. I did not get this error in 3.5a.

Anyone else?

Thanks
Catherine
2 Replies Last Post Feb 21, 2012, 8:07 a.m. EST
COMSOL Moderator

Hello Catherine Robin

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Diego Passarella
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Posted: 1 decade ago Feb 21, 2012, 7:27 a.m. EST
Hello,

I'm having the same problem. I have an evolutionary model (chmm + 2*chcc) that runs in 3.5a and when I try to run it in 4.2 doesn't start because Time Dependent Solver 1 (Sol1/t1) cannot evaluate operator jacobian.

Any suggestions?
Hello, I'm having the same problem. I have an evolutionary model (chmm + 2*chcc) that runs in 3.5a and when I try to run it in 4.2 doesn't start because Time Dependent Solver 1 (Sol1/t1) cannot evaluate operator jacobian. Any suggestions?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 21, 2012, 8:07 a.m. EST
Hi

that probably means you have some Boolean or Dirac type BC defined so that COSOL cannot catch the derivatives of the variables w.r.t. a parameter sweep or the time variable

not easy to say more just like that

--
Good luck
Ivar
Hi that probably means you have some Boolean or Dirac type BC defined so that COSOL cannot catch the derivatives of the variables w.r.t. a parameter sweep or the time variable not easy to say more just like that -- Good luck Ivar

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