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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 The information provided may be out of date.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 2013年1月18日 GMT-5 03:08 RF & Microwave Engineering, Studies & Solvers Version 4.2 7 Replies

Michel Roy
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Hi
I simulate the rib waveguide with the sio2 substrate and material of the core Er:Ta2o5
i define the lambda=1550nm in global definition>parameters, and in the step 1:frequency domain:c_const/lambda
in the electromagnetic wave field i define 2 port for the core(Er:Ta2o5):
port 1:port type :rectangular and wave excitation is on
port 2: port type :rectangular and wave excitation is off
mode type is TE,mode number :10

when i want to simulate,i am getting the following error:

Failed to evaluate variable Jacobian.
- Variable: mod1.emw.tE0modex_2
- Geometry: 1
- Boundary: 7
do you know how to fix this problem?
Thanks in advance for the comments

Michael
7 Replies Last Post 2013年1月21日 GMT-5 14:27
Samuele Lilliu
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Posted: 1 decade ago 2013年1月18日 GMT-5 08:58
try with a different name for lambda, such as lambda_1
try with a different name for lambda, such as lambda_1
Michel Roy
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Posted: 1 decade ago 2013年1月18日 GMT-5 12:40
Hi Samuele

I do it but it does'nt worked. do you have other suggestion?

Thanks in advance
Hi Samuele I do it but it does'nt worked. do you have other suggestion? Thanks in advance
Alexander Kuznetsov
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Posted: 1 decade ago 2013年1月18日 GMT-5 14:55
Most likely your problem is with boundary condition at boundary 7. It's hard to tell how to fix it without knowing what boundary 7 is.
Most likely your problem is with boundary condition at boundary 7. It's hard to tell how to fix it without knowing what boundary 7 is.
Michel Roy
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Posted: 1 decade ago 2013年1月19日 GMT-5 08:19
Hi Alexander
Thanks for your response
I send you the schematic file and marked the 7 boundary.
Thanks in advance

Hi Alexander Thanks for your response I send you the schematic file and marked the 7 boundary. Thanks in advance

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Alexander Kuznetsov
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Posted: 1 decade ago 2013年1月21日 GMT-5 12:42
What's the BC on boundary 7?
What's the BC on boundary 7?
Michel Roy
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Posted: 1 decade ago 2013年1月21日 GMT-5 13:16
Hi Alexander
sorry, what is the BC ?
Hi Alexander sorry, what is the BC ?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2013年1月21日 GMT-5 14:27
Hi

BC = Boundary Condition in this case value set by a "boundary node" in your physics tree

--
Good luck
Ivar
Hi BC = Boundary Condition in this case value set by a "boundary node" in your physics tree -- Good luck Ivar

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