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-   -   Invalid cp (0.000000e+00 J/kgK) for water-vapor at temperature -nan(ind) K (https://www.cfd-online.com/Forums/fluent-multiphase/217620-invalid-cp-0-000000e-00-j-kgk-water-vapor-temperature-nan-ind-k.html)

nvnkush May 19, 2019 09:50

Invalid cp (0.000000e+00 J/kgK) for water-vapor at temperature -nan(ind) K
 
WARNING: Invalid cp (0.000000e+00 J/kgK) for water-vapor at temperature -nan(ind) K

above warning is coming whenever i run my simulation, however i used inbuilt properties of water vapor i.e. piecewise-polynomial.:o

aring July 24, 2019 06:34

This had happened to me before. How I solve my problem is, I disable some of optional functions on my models (i.e. I was working on PEM model and I disable reaction heating on model settings.) After some iteration, when I activate this function again, it does not give an error.

Therefore I believe it is some kind of divergence error.
Try to disable energy equation, or some part of your models if possible, then reactivate them after some iterations

nvnkush July 24, 2019 17:59

Dear aring,
i am facing above problem after many iterations. as my problem is transient heat transfer with phase change, this error comes after 150000 iterations.

engrarif August 16, 2020 22:27

Quote:

Originally Posted by nvnkush (Post 739934)
Dear aring,
i am facing above problem after many iterations. as my problem is transient heat transfer with phase change, this error comes after 150000 iterations.

Hi i am facing the same problem after 3000 iterations. the residuals for all parameters are under 1e-05. Can u plz help me in resolving this issue


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