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heat transfer/ copper contact thermal resistant
Posted Jul 13, 2010, 11:14 a.m. EDT 3 Replies
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I am simulating a heat transfer problem with two cylinder copper assembly together. To study the affect of contact thermal resistant, I set the four contacting faces to " Thin Thermally Resistive Layer". After every boundary being set up, the "Study" results an error:
Failed to evaluate variable Jacobian.
- Variable: mat.k_s
- Geometry: 1
- Boundary: 6 8 9 10
And the 3D plot is definitely wrong. Can anyone tell me what's the problem, am I using the right option for contact thermal resistant?
PS,: when I disable the" Thin Thermally Resistive Layer", the results make sense, which means other setting are good. But what I want is to see the difference after adding contact thermal resistance.
Thanks:-)
Failed to evaluate variable Jacobian.
- Variable: mat.k_s
- Geometry: 1
- Boundary: 6 8 9 10
And the 3D plot is definitely wrong. Can anyone tell me what's the problem, am I using the right option for contact thermal resistant?
PS,: when I disable the" Thin Thermally Resistive Layer", the results make sense, which means other setting are good. But what I want is to see the difference after adding contact thermal resistance.
Thanks:-)
3 Replies Last Post Jul 13, 2010, 2:28 p.m. EDT
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Posted:
1 decade ago
Hi
have you checked that your mat1.k_s ? is defined for mat1 (= the first material selected from the library).
It looks to me, from that error message that it is NOT the case
Good Luck
Ivar
have you checked that your mat1.k_s ? is defined for mat1 (= the first material selected from the library).
It looks to me, from that error message that it is NOT the case
Good Luck
Ivar
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Posted:
1 decade ago
Thanks, the problem is solved by setting the thin thermal resistively layer's K a value.
But I have another problem, another model, mostly the same like previous one, but with a cross-slot surface at one tip. I gave the same boundary condition, but I got another error:
Failed to evaluate variable Jacobian.
- Variable: mat.k22
- Geometry: 1
- Domain: 1 2
Is there any way to check what Variable" mat.k22" is ?
But I have another problem, another model, mostly the same like previous one, but with a cross-slot surface at one tip. I gave the same boundary condition, but I got another error:
Failed to evaluate variable Jacobian.
- Variable: mat.k22
- Geometry: 1
- Domain: 1 2
Is there any way to check what Variable" mat.k22" is ?
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Posted:
1 decade ago
Hi
Its one of the anisotropic heat conduction variable, if I remeber right.
You have the three/four sources (all intersting) to search:
1) do an indexed search on the pdf docs
2) look up the "Physics - Equations Settings - Subdomain variablles ..." in 3.5a (turn on equations in then rpeferences in v4)
3) dump the file as a "m" file and have a look. You can also scan the .history file in 3.5
4) the web Knowledge base and finally the Forum
good luck
Ivar
Its one of the anisotropic heat conduction variable, if I remeber right.
You have the three/four sources (all intersting) to search:
1) do an indexed search on the pdf docs
2) look up the "Physics - Equations Settings - Subdomain variablles ..." in 3.5a (turn on equations in then rpeferences in v4)
3) dump the file as a "m" file and have a look. You can also scan the .history file in 3.5
4) the web Knowledge base and finally the Forum
good luck
Ivar