PressureGradientForce.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2013 OpenFOAM Foundation
     \\/     M anipulation  |
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License
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    under the terms of the GNU General Public License as published by
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "PressureGradientForce.H"
#include "fvcDdt.H"
#include "fvcGrad.H"
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::PressureGradientForce<CloudType>::PressureGradientForce
(
    CloudType& owner,
    const fvMesh& mesh,
    const dictionary& dict,
    const word& forceType
)
:
    ParticleForce<CloudType>(owner, mesh, dict, forceType, true),
    UName_(this->coeffs().template lookupOrDefault<word>("U", "U")),
    DUcDtInterpPtr_(NULL)
{}
 
 
template<class CloudType>
Foam::PressureGradientForce<CloudType>::PressureGradientForce
(
    const PressureGradientForce& pgf
)
:
    ParticleForce<CloudType>(pgf),
    UName_(pgf.UName_),
    DUcDtInterpPtr_(NULL)
{}
 
 
// * * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::PressureGradientForce<CloudType>::~PressureGradientForce()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class CloudType>
void Foam::PressureGradientForce<CloudType>::cacheFields(const bool store)
{
    static word fName("DUcDt");
 
    bool fieldExists = this->mesh().template foundObject<volVectorField>(fName);
 
    if (store)
    {
        if (!fieldExists)
        {
            const volVectorField& Uc = this->mesh().template
                lookupObject<volVectorField>(UName_);
 
            volVectorField* DUcDtPtr = new volVectorField
            (
                fName,
                fvc::ddt(Uc) + (Uc & fvc::grad(Uc))
            );
 
            DUcDtPtr->store();
        }
 
        const volVectorField& DUcDt = this->mesh().template
            lookupObject<volVectorField>(fName);
 
        DUcDtInterpPtr_.reset
        (
            interpolation<vector>::New
            (
                this->owner().solution().interpolationSchemes(),
                DUcDt
            ).ptr()
        );
    }
    else
    {
        DUcDtInterpPtr_.clear();
 
        if (fieldExists)
        {
            const volVectorField& DUcDt = this->mesh().template
                lookupObject<volVectorField>(fName);
 
            const_cast<volVectorField&>(DUcDt).checkOut();
        }
    }
}
 
 
template<class CloudType>
Foam::forceSuSp Foam::PressureGradientForce<CloudType>::calcCoupled
(
    const typename CloudType::parcelType& p,
    const scalar dt,
    const scalar mass,
    const scalar Re,
    const scalar muc
) const
{
    forceSuSp value(vector::zero, 0.0);
 
    vector DUcDt =
        DUcDtInterp().interpolate(p.position(), p.currentTetIndices());
 
    value.Su() = mass*p.rhoc()/p.rho()*DUcDt;
 
    return value;
}
 
 
template<class CloudType>
Foam::scalar Foam::PressureGradientForce<CloudType>::massAdd
(
    const typename CloudType::parcelType&,
    const scalar
) const
{
    return 0.0;
}
 
 
// ************************************************************************* //