Relaxation.H

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    Copyright (C) 2013-2016 OpenFOAM Foundation
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    for more details.
 
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Class
    Foam::DampingModels::Relaxation
 
Group
    grpLagrangianIntermediateMPPICDampingSubModels
 
Description
    Relaxation collisional damping model.
 
    Particle velocities are relaxed towards the local mean over a time-scale.
 
    Reference:
    \verbatim
        "An improved collision damping time for MP-PIC calculations of dense
        particle flows with applications to polydisperse sedimenting beds and
        colliding particle jets"
        P O'Rourke and D Snider
        Chemical Engineering Science
        Volume 65, Issue 22, Pages 6014-6028, November 2010
    \endverbatim
 
SourceFiles
    Relaxation.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Relaxation_H
#define Relaxation_H
 
#include "DampingModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace DampingModels
{
 
/*---------------------------------------------------------------------------*\
                         Class Relaxation Declaration
\*---------------------------------------------------------------------------*/
 
template<class CloudType>
class Relaxation
:
    public DampingModel<CloudType>
{
private:
 
    // Private data
 
        //- Velocity average
        const AveragingMethod<vector>* uAverage_;
 
        //- Reciprocal of the time scale average
        autoPtr<AveragingMethod<scalar>> oneByTimeScaleAverage_;
 
 
public:
 
    //- Runtime type information
    TypeName("relaxation");
 
    // Constructors
 
        //- Construct from components
        Relaxation(const dictionary& dict, CloudType& owner);
 
        //- Construct copy
        Relaxation(const Relaxation<CloudType>& cm);
 
        //- Construct and return a clone
        virtual autoPtr<DampingModel<CloudType>> clone() const
        {
            return autoPtr<DampingModel<CloudType>>
            (
                new Relaxation<CloudType>(*this)
            );
        }
 
 
    //- Destructor
    virtual ~Relaxation();
 
 
    //- Member Functions
 
        //- Calculate the damping time scales
        virtual void cacheFields(const bool store);
 
        //- Calculate the velocity correction
        virtual vector velocityCorrection
        (
            typename CloudType::parcelType& p,
            const scalar deltaT
        ) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace DampingModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "Relaxation.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //