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Error in evaluating variable Jacobian. - Variable: mat.nu

Posted 07.03.2011, 12:46 GMT-5 Structural Mechanics Version 4.1 7 Replies

Ali
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Hello everyone,

I 'm using comsol V4.1a.

I am trying to simulate electromagnetic force problem in solid mechanics model.

But I am having the following prob.

Error:
Failed to evaluate variable Jacobian.
- Variable: mat.nu
- Geometry: 1
- Domain: 2


I removed Air from solid Geometry but still have same error.

I cant find out the error.Please help me.

M.Ali

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7 Replies Last Post 01.07.2011, 01:08 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 08.03.2011, 01:35 GMT-5
Hi

"nu" is the Poisson coefficient, are you sure you have rechecked your material settings and nothing is missing ?

--
Good luck
Ivar
Hi "nu" is the Poisson coefficient, are you sure you have rechecked your material settings and nothing is missing ? -- Good luck Ivar
Ali
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Posted: 1 decade ago 08.03.2011, 03:26 GMT-5
Thanks,

I fixed that error but still have

Error:
Failed to evaluate variable Jacobian.
- Variable: ec.Jz
- Geometry: 1
- Domain: 2

what is this error for?

Thanks, I fixed that error but still have Error: Failed to evaluate variable Jacobian. - Variable: ec.Jz - Geometry: 1 - Domain: 2 what is this error for?
Ali
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Posted: 1 decade ago 08.03.2011, 04:35 GMT-5
Hi,
I fixed this problem.
thnx
Hi, I fixed this problem. thnx
Rakesh Patel
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Posted: 1 decade ago 01.04.2011, 02:30 GMT-4
i have same problem like you?

could you explain me how you solved it?

i have geometry of floating buoy on fluid.at the computing it shows jacobian error and sol1/t1 failed to compute....
i have same problem like you? could you explain me how you solved it? i have geometry of floating buoy on fluid.at the computing it shows jacobian error and sol1/t1 failed to compute....
Ali
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Posted: 1 decade ago 01.04.2011, 13:10 GMT-4
It's comsol bug that has to get fixed. anyway, you have to change the Jacobian name to capital form. like ec.JZ, instead of ec.Jz.
--
Best regards,
Ali
It's comsol bug that has to get fixed. anyway, you have to change the Jacobian name to capital form. like ec.JZ, instead of ec.Jz. -- Best regards, Ali
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 02.04.2011, 10:48 GMT-4
Hi

then it's probably not a "bug" as z and Z are not refering to the same frames, it's related with the Eulerian or Lagrangien reference frames, take a look at

en.wikipedia.org/wiki/Lagrangian_reference_frame

--
Good luck
Ivar
Hi then it's probably not a "bug" as z and Z are not refering to the same frames, it's related with the Eulerian or Lagrangien reference frames, take a look at http://en.wikipedia.org/wiki/Lagrangian_reference_frame -- Good luck Ivar
comsol newbie
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Posted: 1 decade ago 01.07.2011, 01:08 GMT-4

I am getting a similar error.
Failed to evaluate variable jacobian
- Variable: u
- Geometry: 1
- Dimension: 2
- Domain group: {1,7}

I am doing conjugate heat transfer in 2d. Basically trying to connect weakly compressible NS and General HT. In subdomain settings of HT when i put u and v after enabling convective ht, i get this error. How can i get rid of it?
I am getting a similar error. Failed to evaluate variable jacobian - Variable: u - Geometry: 1 - Dimension: 2 - Domain group: {1,7} I am doing conjugate heat transfer in 2d. Basically trying to connect weakly compressible NS and General HT. In subdomain settings of HT when i put u and v after enabling convective ht, i get this error. How can i get rid of it?

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