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Undefined value found in the equation residual vector
Posted Apr 25, 2015, 3:28 a.m. EDT Fluid & Heat, Heat Transfer & Phase Change, Studies & Solvers Version 5.0 1 Reply
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hi. i met some problems during simulating a conjugate heat transfer problem. I tried to finer the mesh but it could not help. The detailed description is as following:
Undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 283 degrees of freedom giving NaN/Inf in the vector for the variable comp1.T.
at coordinates: (1.17089,3.35878), (1.16589,3.35878), (1.16839,3.35605), (1.17089,3.35333), (1.16589,3.35329), ...
- Feature: Stationary Solver 1 (sol1/s1)
thank you for your help
Undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 283 degrees of freedom giving NaN/Inf in the vector for the variable comp1.T.
at coordinates: (1.17089,3.35878), (1.16589,3.35878), (1.16839,3.35605), (1.17089,3.35333), (1.16589,3.35329), ...
- Feature: Stationary Solver 1 (sol1/s1)
thank you for your help
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1 Reply Last Post Apr 26, 2015, 12:06 p.m. EDT
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Posted:
10 years ago
Hi
I do not believe that error is a mesh issue, it's rather a missing or incomplete BC issue, you might have some Boundary Condition missing (Conjugated Heat Transfer means 3 Physics: fluid, solid and heat => you need enough BC's PER physics to solve all three!) and often your material properties do not have a T component or does have one but is not reading the correct T value ...
There are many causes. Often it helps to rebuild a simpler model and check it one physics at the time.
Just now I do not have access to my WS so I cannot open your model, so I can only guess
--
Good luck
Ivar
I do not believe that error is a mesh issue, it's rather a missing or incomplete BC issue, you might have some Boundary Condition missing (Conjugated Heat Transfer means 3 Physics: fluid, solid and heat => you need enough BC's PER physics to solve all three!) and often your material properties do not have a T component or does have one but is not reading the correct T value ...
There are many causes. Often it helps to rebuild a simpler model and check it one physics at the time.
Just now I do not have access to my WS so I cannot open your model, so I can only guess
--
Good luck
Ivar