Failed to evaluate variable Jacobian

Topics: 4.2, RF Module, Solving

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Michel Roy

Michel Roy

January 18, 2013 8:08am UTC

Failed to evaluate variable Jacobian

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

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Samuele Lilliu

Samuele Lilliu

January 18, 2013 1:58pm UTC in response to Michel Roy

Re: Failed to evaluate variable Jacobian

try with a different name for lambda, such as lambda_1

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Michel Roy

Michel Roy

January 18, 2013 5:40pm UTC in response to Samuele Lilliu

Re: Failed to evaluate variable Jacobian

Hi Samuele

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

Thanks in advance

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Alexander Kuznetsov

Alexander Kuznetsov

January 18, 2013 7:55pm UTC in response to Michel Roy

Re: Failed to evaluate variable Jacobian

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.

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Michel Roy

Michel Roy

January 19, 2013 1:19pm UTC in response to Alexander Kuznetsov

Re: Failed to evaluate variable Jacobian

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

Attachments:   3d waveguide.JPG  

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Alexander Kuznetsov

Alexander Kuznetsov

January 21, 2013 5:42pm UTC in response to Michel Roy

Re: Failed to evaluate variable Jacobian

What's the BC on boundary 7?

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Michel Roy

Michel Roy

January 21, 2013 6:16pm UTC in response to Alexander Kuznetsov

Re: Failed to evaluate variable Jacobian

Hi Alexander
sorry, what is the BC ?

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Ivar Kjelberg

Ivar Kjelberg

January 21, 2013 7:27pm UTC in response to Michel Roy

Re: Failed to evaluate variable Jacobian

Hi

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

--
Good luck
Ivar

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