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

nvnkush · May 19, 2019, 08:50

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.

aring · July 24, 2019, 05:34

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, 16:59

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, 21:27

Quote:

Originally Posted by nvnkush

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

May 19, 2019, 08:50	Invalid cp (0.000000e+00 J/kgK) for water-vapor at temperature -nan(ind) K	#1
nvnkush New Member Naveen Join Date: Jan 2016 Location: INDIA Posts: 20 Rep Power: 9	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.

July 24, 2019, 05:34		#2
aring New Member Arin Altuntas Join Date: May 2019 Posts: 3 Rep Power: 6	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 likes this.

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July 24, 2019, 16:59		#3
nvnkush New Member Naveen Join Date: Jan 2016 Location: INDIA Posts: 20 Rep Power: 9	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.