GidaspowErgunWenYuDrag.C

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#include "GidaspowErgunWenYuDrag.H"
#include "SchillerNaumannDrag.H"
#include "addToRunTimeSelectionTable.H"
#include "coupledToConstantDensityFluid.H"
#include "coupledToFluid.H"
#include "sphericalCoupled.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Lagrangian
{
    defineTypeNameAndDebug(GidaspowErgunWenYuDrag, 0);
    addToRunTimeSelectionTable
    (
        LagrangianModel,
        GidaspowErgunWenYuDrag,
        dictionary
    );
}
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
Foam::tmp<Foam::LagrangianSubScalarField>
Foam::Lagrangian::GidaspowErgunWenYuDrag::calcD
(
    const LagrangianModelRef& model,
    const LagrangianSubMesh& subMesh
) const
{
    const clouds::spherical& sCloud = cloud<clouds::spherical>();
    const clouds::sphericalCoupled& scCloud = cloud<clouds::sphericalCoupled>();
 
    tmp<LagrangianSubScalarSubField> td = sCloud.d(model, subMesh);
    const LagrangianSubScalarSubField& d = td();
    const LagrangianSubScalarField& Re = scCloud.Re(model, subMesh);
 
    const LagrangianSubScalarField alpha(min(sCloud.alpha(subMesh), alphaMax_));
    const LagrangianSubScalarField alphac(1 - alpha);
 
    const LagrangianSubScalarField CdRe
    (
        // Use Wen-Yu at low particulate fractions (< 20%) ...
        pos0(alphac - 0.8)
       *SchillerNaumannDrag::CdRe(alphac*Re)
       *pow(alphac, -2.65)
 
        // ... and Ergun at high particulate fractions (> 20%)
      + neg(alphac - 0.8)*(4.0/3.0)*(150*alpha/alphac + 1.75*Re)
    );
 
    assertCloud
    <
        clouds::coupledToConstantDensityFluid,
        clouds::coupledToFluid
    >();
 
    tmp<LagrangianSubScalarField> tmucByRhoOrMuc =
        isCloud<clouds::coupledToConstantDensityFluid>()
      ? (
            cloud<clouds::coupledToConstantDensityFluid>().nuc(model, subMesh)
           /cloud<clouds::coupledToConstantDensityFluid>().rhoByRhoc
        )
      : tmp<LagrangianSubScalarField>
        (
            cloud<clouds::coupledToFluid>().muc(model, subMesh)
        );
 
    return CdRe*(constant::mathematical::pi/8)*d*tmucByRhoOrMuc;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::Lagrangian::GidaspowErgunWenYuDrag::GidaspowErgunWenYuDrag
(
    const word& name,
    const LagrangianMesh& mesh,
    const dictionary& modelDict,
    const dictionary& stateDict
)
:
    drag(name, mesh, modelDict, stateDict),
    alphaMax_(modelDict.lookup<scalar>("alphaMax", units::fraction))
{}
 
 
// ************************************************************************* //