[kane]

I have tried to check the codes of fvdom.C
(src/thermophysicalModels/radiation/radiationModels/fvDOM)

I found this codes. But I don't know why Rp(),Ru() declares in fvdom.C

Foam::tmp<Foam::volScalarField> Foam::radiation::fvDOM::Rp() const
{
    return tmp<volScalarField>
    (
        new volScalarField
        (
            IOobject
            (
                "Rp",
                mesh_.time().timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                false
            ),
            // Only include continuous phase emission
            4*absorptionEmission_->aCont()*physicoChemical::sigma
        )
    );
}


Foam::tmp<Foam::DimensionedField<Foam::scalar, Foam::volMesh>>
Foam::radiation::fvDOM::Ru() const
{

    const volScalarField::Internal& G =
        G_();

    const volScalarField::Internal E =
        absorptionEmission_->ECont()()();

    // Only include continuous phase absorption
    const volScalarField::Internal a =
        absorptionEmission_->aCont()()();

    return a*G - E;
}

Why Rp(), Ru() is necessary in fvdom.C??