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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Failed to evaluate variable Jacobian.

Posted 2011年12月16日 GMT-5 02:15 Version 4.2 4 Replies

Ma Jun
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Hi, All
May I use microwave heating, error is

Failed to evaluate variable Jacobian.
- Variable: mod1.mh.iomega
- Geometry: 1
- Boundary: 1 2 3 4 11 12 14 15 16 18

What can I can do?
What is the message meaning?

Thank you!
4 Replies Last Post 2011年12月21日 GMT-5 04:15
J Hamedi
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Posted: 1 decade ago 2011年12月20日 GMT-5 03:55
I have this problem too...
I have this problem too...
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年12月20日 GMT-5 04:07
Hi

most probably you have an input error in one of the formula defining the frequency, or that you have given a formula that cannot be derived so that the Jacobian cannot be extracted, then the solver does not know how/where to "through" for the next guess in it's iterative solving process

--
Good luck
Ivar
Hi most probably you have an input error in one of the formula defining the frequency, or that you have given a formula that cannot be derived so that the Jacobian cannot be extracted, then the solver does not know how/where to "through" for the next guess in it's iterative solving process -- Good luck Ivar
Charukesh Vasudevan
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Posted: 1 decade ago 2011年12月20日 GMT-5 12:38
Hi
Check whether u have entered all the values
Check whether u have selected domains for load or material
If u still get the same error, Check whether u have entered the correct equation or correct function definition

Good luck
Hi Check whether u have entered all the values Check whether u have selected domains for load or material If u still get the same error, Check whether u have entered the correct equation or correct function definition Good luck
J Hamedi
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Posted: 1 decade ago 2011年12月21日 GMT-5 04:15
Thanks..
It was for wrong selected domain for equations.

Thanks.. It was for wrong selected domain for equations.

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