PrinceBlanch.C

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#include "PrinceBlanch.H"
#include "addToRunTimeSelectionTable.H"
#include "mathematicalConstants.H"
#include "phaseCompressibleTurbulenceModel.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace diameterModels
{
namespace coalescenceModels
{
    defineTypeNameAndDebug(PrinceBlanch, 0);
    addToRunTimeSelectionTable
    (
        coalescenceModel,
        PrinceBlanch,
        dictionary
    );
}
}
}

using Foam::constant::mathematical::pi;

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::diameterModels::coalescenceModels::PrinceBlanch::
PrinceBlanch
(
    const populationBalanceModel& popBal,
    const dictionary& dict
)
:
    coalescenceModel(popBal, dict),
    C1_("C1", dimless, dict.lookupOrDefault<scalar>("C1", 0.356)),
    h0_("h0", dimLength, dict.lookupOrDefault<scalar>("h0", 1e-4)),
    hf_("hf", dimLength, dict.lookupOrDefault<scalar>("h0", 1e-8)),
    turbulentCollisions_(dict.lookup("turbulentCollisions")),
    buoyantCollisions_(dict.lookup("buoyantCollisions")),
    laminarShearCollisions_(dict.lookup("laminarShearCollisions"))
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::diameterModels::coalescenceModels::PrinceBlanch::
addToCoalescenceRate
(
    volScalarField& coalescenceRate,
    const label i,
    const label j
)
{
    const phaseModel& continuousPhase = popBal_.continuousPhase();
    const sizeGroup& fi = *popBal_.sizeGroups()[i];
    const sizeGroup& fj = *popBal_.sizeGroups()[j];
    const uniformDimensionedVectorField& g =
        popBal_.mesh().lookupObject<uniformDimensionedVectorField>("g");

    dimensionedScalar rij(1.0/(1.0/fi.d() + 1.0/fj.d()));

    const volScalarField collisionEfficiency
    (
        exp
        (
          - sqrt
            (
                pow3(rij)*continuousPhase.rho()
               /(16.0*popBal_.sigmaWithContinuousPhase(fi.phase()))
            )
           *log(h0_/hf_)
           *cbrt(popBal_.continuousTurbulence().epsilon())/pow(rij, 2.0/3.0)
        )
    );

    if (turbulentCollisions_)
    {
        coalescenceRate +=
            (
                C1_*pi*sqr(fi.d() + fj.d())
               *cbrt(popBal_.continuousTurbulence().epsilon())
               *sqrt(pow(fi.d(), 2.0/3.0) + pow(fj.d(), 2.0/3.0))
            )
           *collisionEfficiency;
    }

    if (buoyantCollisions_)
    {
        dimensionedScalar Sij(pi/4.0*sqr(fi.d() + fj.d()));

        coalescenceRate +=
            (
                Sij
               *mag
                (
                    sqrt
                    (
                        2.14*popBal_.sigmaWithContinuousPhase(fi.phase())
                       /(continuousPhase.rho()*fi.d()) + 0.505*mag(g)*fi.d()
                    )
                  - sqrt
                    (
                        2.14*popBal_.sigmaWithContinuousPhase(fi.phase())
                       /(continuousPhase.rho()*fj.d()) + 0.505*mag(g)*fj.d()
                    )
                )
            )
           *collisionEfficiency;
    }

    if (laminarShearCollisions_)
    {
        FatalErrorInFunction
            << "Laminar shear collision contribution not implemented for "
            << this->type() << " coalescence model."
            << exit(FatalError);
    }
}


// ************************************************************************* //