openfoam/applications/solvers/heatTransfer/thermoFoam/setAlphaEff.H

    Info<< "Creating turbulence model\n" << endl;
    tmp<volScalarField> talphaEff;

    IOobject turbulencePropertiesHeader
    (
        "turbulenceProperties",
        runTime.constant(),
        mesh,
        IOobject::MUST_READ_IF_MODIFIED,
        IOobject::NO_WRITE,
        false
    );

    if (turbulencePropertiesHeader.headerOk())
    {
        autoPtr<compressible::turbulenceModel> turbulence
        (
            compressible::turbulenceModel::New
            (
                rho,
                U,
                phi,
                thermo
            )
        );

        talphaEff = turbulence->alphaEff();
    }
    else
    {
        talphaEff = tmp<volScalarField>
        (
            new volScalarField
            (
                IOobject
                (
                    "alphaEff",
                    runTime.timeName(),
                    mesh,
                    IOobject::NO_READ,
                    IOobject::NO_WRITE
                ),
                mesh,
                dimensionedScalar("0", dimMass/dimLength/dimTime, 0.0)
            )
        );
    }

    const volScalarField& alphaEff = talphaEff();