CFD Online Discussion Forums

CFD Online Discussion Forums (
-   OpenFOAM Pre-Processing (
-   -   thermophysicalProperties Cp Units (

jgomez July 11, 2012 13:33

thermophysicalProperties Cp Units
Hello dear all,

This is probably a stupid question but i havenīt been able to find a clear answer in the forums...

Are the units of the heat capacity at constant pressure (Cp) in the thermophysicalProperties file [J/kmol K] or [J/kg K]? I found this thread ( where somebody said that the units are [J/kmol K], and i found the same units in /src/thermophysicalModels/specie/thermo/hConst/hConstThermo.H in line 141:

//- Heat capacity at constant pressure [J/(kmol K)]
inline scalar cp(const scalar T) const;

However, in the angledDuct tutorial for rhoPimpleFoam, the Cp value (air) is 1007, which looks to me like [J/kg K]... Is this an error in the tutorial?

Best Regards

All times are GMT -4. The time now is 07:22.