CFD Online Discussion Forums - molar mass of mixture

Hey Charles,

the mixture averaged molar mass can be accessed via the mixture classes in the thermophysicalModels library (at least in my version, of1612). The mixture itself is a "part" of the thermo object which is used in your solver. In order to access it, something similar to

Code:

const auto mixture = thermo.composition();

should work. In order to output the mixture averaged molar mass, you could do something like this (not tested):

Code:

// create new field to get the mixture at write time

volScalarField mixtureMolarMass

(

    IOobject

    (

        "WMixture",

        runTime.timeName(),

        mesh,

        IOobject::NO_READ,

        IOobject::AUTO_WRITE

    ),

    mixture.W()

);

Though it is unlikely, the function you have to call may be different for your specific case (here I assumed the mixture type you are using is derived from the basicSpecieMixture class).

Cheers
RP