[AshwaniAssam]

Hi all,


In the file thermodynamicConstants.C the definition of universal gas constant is defined as

      // Note: the 1e3 converts from /mol to /kmol for consistency with the
     // SI choice of kg rather than g for mass.

     // This is not appropriate for USCS and will be changed to an entry in

     // the DimensionedConstants dictionary in etc/controlDict

     const scalar RR = 1e3*physicoChemical::R.value();

What I understand is the universal gas constant is denoted by R.value(). Where is this defined I am unable to locate.



I am trying to ascertain what is the gas constant value used by the perfect gas model. I want to use the gas constant value as 1.

[Tobi]

Hi,


you can use Doxygen for that:


https://cpp.openfoam.org/v7/physicoC...8C_source.html

[AshwaniAssam]

Thank you. I found the answer in the file you directed.

Universal gas constant = Avogadro No. * Boltzmann constant = NA * k

NA is defined in fundamentalConstants.C and k is defined dynamically in

OpenFOAM/OpenFOAM-v1906/etc/controlDict