drippingEjection.C

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#include "drippingEjection.H"
#include "addToRunTimeSelectionTable.H"
#include "fvMesh.H"
#include "Time.H"
#include "mathematicalConstants.H"
#include "Random.H"
#include "volFields.H"
#include "kinematicSingleLayer.H"

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

namespace Foam
{
namespace regionModels
{
namespace surfaceFilmModels
{

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

defineTypeNameAndDebug(drippingEjection, 0);
addToRunTimeSelectionTable(ejectionModel, drippingEjection, dictionary);

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

drippingEjection::drippingEjection
(
    surfaceFilmRegionModel& film,
    const dictionary& dict
)
:
    ejectionModel(type(), film, dict),
    deltaStable_(coeffDict_.lookup<scalar>("deltaStable")),
    particlesPerParcel_(coeffDict_.lookup<scalar>("particlesPerParcel")),
    rndGen_(label(0)),
    parcelDistribution_
    (
        distributionModel::New
        (
            coeffDict_.subDict("parcelDistribution"),
            rndGen_
        )
    ),
    diameter_(film.regionMesh().nCells(), -1.0)
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

drippingEjection::~drippingEjection()
{}


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

void drippingEjection::correct
(
    scalarField& availableMass,
    scalarField& massToEject,
    scalarField& diameterToEject
)
{
    const kinematicSingleLayer& film =
        refCast<const kinematicSingleLayer>(this->film());

    const scalar pi = constant::mathematical::pi;

    // calculate available dripping mass
    const scalarField gNorm(film.g() & film.nHat()());
    const scalarField& magSf = film.magSf();

    const scalarField& delta = film.delta();
    const scalarField& rho = film.rho();

    scalarField massDrip(film.regionMesh().nCells(), 0.0);

    forAll(gNorm, i)
    {
        if (gNorm[i] > small)
        {
            const scalar ddelta = max(0.0, delta[i] - deltaStable_);
            massDrip[i] +=
                min(availableMass[i], max(0.0, ddelta*rho[i]*magSf[i]));
        }
    }


    // Collect the data to be transferred
    forAll(massDrip, celli)
    {
        if (massDrip[celli] > 0)
        {
            // set new particle diameter if not already set
            if (diameter_[celli] < 0)
            {
                diameter_[celli] = parcelDistribution_->sample();
            }

            scalar& diam = diameter_[celli];
            scalar rhoc = rho[celli];
            scalar minMass = particlesPerParcel_*rhoc*pi/6*pow3(diam);

            if (massDrip[celli] > minMass)
            {
                // All drip mass can be ejected
                massToEject[celli] += massDrip[celli];
                availableMass[celli] -= massDrip[celli];

                // Set particle diameter
                diameterToEject[celli] = diam;

                // Retrieve new particle diameter sample
                diam = parcelDistribution_->sample();

                addToEjectedMass(massDrip[celli]);
            }
            else
            {
                // Particle mass below minimum threshold - cannot be ejected
                massToEject[celli] = 0.0;
                diameterToEject[celli] = 0.0;
            }
        }
        else
        {
            massToEject[celli] = 0.0;
            diameterToEject[celli] = 0.0;
        }
    }

    ejectionModel::correct();
}


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

} // End namespace surfaceFilmModels
} // End namespace regionModels
} // End namespace Foam

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