constInjector.C

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#include "constInjector.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>
#include <OpenFOAM/mathematicalConstants.H>

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

namespace Foam
{

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

defineTypeNameAndDebug(constInjector, 0);

addToRunTimeSelectionTable
(
    injectorModel,
    constInjector,
    dictionary
);


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

// Construct from components
constInjector::constInjector
(
    const dictionary& dict,
    spray& sm
)
:
    injectorModel(dict, sm),
    specDict_(dict.subDict(typeName + "Coeffs")),
    dropletNozzleDiameterRatio_(specDict_.lookup("dropletNozzleDiameterRatio")),
    sprayAngle_(specDict_.lookup("sprayAngle"))
{
    if (sm.injectors().size() != dropletNozzleDiameterRatio_.size())
    {
        FatalError << "constInjector::constInjector"
            << "(const dictionary& dict, spray& sm)\n"
            << "Wrong number of entries in dropletNozzleDiameterRatio"
            << abort(FatalError);
    }

    if (sm.injectors().size() != sprayAngle_.size())
    {
        FatalError << "constInjector::constInjector"
            << "(const dictionary& dict, spray& sm)\n"
            << "Wrong number of entries in sprayAngle"
            << abort(FatalError);
    }

    scalar referencePressure = sm.p().average().value();

    // correct velocity and pressure profiles
    forAll(sm.injectors(), i)
    {
        sm.injectors()[i].properties()->correctProfiles(sm.fuels(), referencePressure);
    }

}


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

constInjector::~constInjector()
{}


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

scalar constInjector::d0
(
    const label n, 
    const scalar
) const
{
    return injectors_[n].properties()->d()*dropletNozzleDiameterRatio_[n];
}


vector constInjector::direction
(
    const label n,
    const label hole,
    const scalar time,
    const scalar d
) const
{

    /*
        randomly distribute parcels in a solid cone
        with angle = sprayAngle,
        alpha = radius of the two normal vectors,
        = maximum sin(sprayAngle/2)
        beta = angle in the normal plane
        
                        o                    / (beta)
                        |\                  /
                        | \                /)
                        |  \              o-----------> (x-axis)
                        |   \
                        v  (alpha)
        */

    scalar angle = rndGen_.scalar01()*sprayAngle_[n]*mathematicalConstant::pi/360.0;
    scalar alpha = sin(angle);
    scalar dcorr = cos(angle);

    scalar beta = 2.0*mathematicalConstant::pi*rndGen_.scalar01();

    // randomly distributed vector normal to the injection vector
    vector normal = vector::zero;
    
    if (sm_.twoD())
    {
        scalar reduce = 0.01;
        // correct beta if this is a 2D run
        // map it onto the 'angleOfWedge'
        beta *= (1.0-2.0*reduce)*0.5*sm_.angleOfWedge()/mathematicalConstant::pi;
        beta += reduce*sm_.angleOfWedge();

        normal = alpha*
        (
            sm_.axisOfWedge()*cos(beta) +
            sm_.axisOfWedgeNormal()*sin(beta)
        );

    }
    else
    {
        normal = alpha*
        (
            injectors_[n].properties()->tan1(hole)*cos(beta) +
            injectors_[n].properties()->tan2(hole)*sin(beta)
        );
    }
    
    // set the direction of injection by adding the normal vector
    vector dir = dcorr*injectors_[n].properties()->direction(n, time) + normal;
    dir /= mag(dir);

    return dir;
}

scalar constInjector::velocity
(
    const label i,
    const scalar time
) const
{
    const injectorType& it = sm_.injectors()[i].properties();
    if (it.pressureIndependentVelocity())
    {
        return it.getTableValue(it.velocityProfile(), time);
    }
    else
    {
        scalar Pref = sm_.ambientPressure();
        scalar Pinj = it.getTableValue(it.injectionPressureProfile(), time);
        scalar rho = sm_.fuels().rho(Pinj, it.T(time), it.X());
        scalar dp = max(0.0, Pinj - Pref);
        return sqrt(2.0*dp/rho);
    }
}

scalar constInjector::averageVelocity
(
    const label i
) const
{    
    const injectorType& it = sm_.injectors()[i].properties();
    scalar dt = it.teoi() - it.tsoi();

    return it.integrateTable(it.velocityProfile())/dt;
}

} // End namespace Foam

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