PrinceBlanch.C

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#include "PrinceBlanch.H"
#include "fvcGrad.H"
#include "phaseCompressibleMomentumTransportModel.H"
#include "uniformDimensionedFields.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace populationBalance
{
namespace coalescenceModels
{
    defineTypeNameAndDebug(PrinceBlanch, 0);
    addToRunTimeSelectionTable
    (
        coalescenceModel,
        PrinceBlanch,
        dictionary
    );
}
}
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::populationBalance::coalescenceModels::PrinceBlanch::PrinceBlanch
(
    const populationBalanceModel& popBal,
    const dictionary& dict
)
:
    coalescenceModel(popBal, dict),
    C1_("C1", dimless, dict, 0.356),
    h0_("h0", dimLength, dict, 1e-4),
    hf_("hf", dimLength, dict, 1e-8),
    turbulence_(dict.lookup("turbulence")),
    buoyancy_(dict.lookup("buoyancy")),
    laminarShear_(dict.lookup("laminarShear"))
{
    if (laminarShear_)
    {
        shearStrainRate_.set
        (
            new volScalarField::Internal
            (
                IOobject
                (
                    "shearStrainRate",
                    popBal_.time().name(),
                    popBal_.mesh()
                ),
                popBal_.mesh(),
                dimensionedScalar
                (
                    "shearStrainRate",
                    dimVelocity/dimLength,
                    Zero
                )
            )
        );
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::populationBalance::coalescenceModels::PrinceBlanch::precompute()
{
    if (laminarShear_)
    {
        shearStrainRate_() =
            sqrt(2.0)*mag(symm(fvc::grad(popBal_.continuousPhase().U())));
    }
}
 
 
Foam::tmp<Foam::volScalarField::Internal>
Foam::populationBalance::coalescenceModels::PrinceBlanch::rate
(
    const label i,
    const label j
) const
{
    using Foam::constant::mathematical::pi;
 
    const dimensionedScalar& dSphi = popBal_.dSph(i);
    const dimensionedScalar& dSphj = popBal_.dSph(j);
 
    const volScalarField::Internal& rhoc = popBal_.continuousPhase().rho();
 
    tmp<volScalarField> tsigma(popBal_.sigmaWithContinuousPhase(i));
    const volScalarField::Internal& sigma = tsigma();
 
    tmp<volScalarField> tepsilonc(popBal_.continuousTurbulence().epsilon());
    const volScalarField::Internal& epsilonc = tepsilonc();
 
    const uniformDimensionedVectorField& g =
        popBal_.mesh().lookupObject<uniformDimensionedVectorField>("g");
 
    const dimensionedScalar rij(1/(1/dSphi + 1/dSphj));
 
    const volScalarField::Internal collisionEfficiency
    (
        exp
        (
          - sqrt(pow3(rij)*rhoc/(16*sigma))
           *log(h0_/hf_)
           *cbrt(epsilonc)
           /pow(rij, 2.0/3.0)
        )
    );
 
    tmp<volScalarField::Internal> tcoalescenceRate =
        volScalarField::Internal::New
        (
            "coalescenceRate",
            popBal_.mesh(),
            dimensionedScalar(dimVolume/dimTime, scalar(0))
        );
    volScalarField::Internal& coalescenceRate = tcoalescenceRate.ref();
 
    if (turbulence_)
    {
        coalescenceRate +=
            (
                C1_
               *pi
               *sqr(dSphi + dSphj)
               *cbrt(epsilonc)
               *sqrt(pow(dSphi, 2.0/3.0) + pow(dSphj, 2.0/3.0))
            )
           *collisionEfficiency;
    }
 
    if (buoyancy_)
    {
        const dimensionedScalar Sij(pi/4*sqr(dSphi + dSphj));
 
        coalescenceRate +=
            Sij
           *mag
            (
                sqrt(2.14*sigma/(rhoc*dSphi) + 0.505*mag(g)*dSphi)
              - sqrt(2.14*sigma/(rhoc*dSphj) + 0.505*mag(g)*dSphj)
            )
           *collisionEfficiency;
    }
 
    if (laminarShear_)
    {
        coalescenceRate +=
            pow3(dSphi + dSphj)/6
           *shearStrainRate_()*collisionEfficiency;
    }
 
    return tcoalescenceRate;
}
 
 
// ************************************************************************* //