curvatureSeparation.H

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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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::filmEjectionModels::curvatureSeparation
 
Description
    Curvature induced separation film to cloud ejection transfer model
 
    Assesses film curvature via the mesh geometry and calculates a force
    balance of the form:
 
        F_sum = F_inertial + F_body + F_surface_tension
 
    If F_sum < 0, the film separates and is transferred to the cloud
    if F_sum >= 0 the film remains attached.
 
    Reference:
    \verbatim
        Owen, I., & Ryley, D. J. (1985).
        The flow of thin liquid films around corners.
        International journal of multiphase flow, 11(1), 51-62.
    \endverbatim
 
Usage
    Example usage:
    \verbatim
    filmCloudTransfer
    {
        type    filmCloudTransfer;
 
        ejection
        {
            model   curvatureSeparation;
 
            deltaStable 5e-4;
        }
    }
    \endverbatim
 
SourceFiles
    curvatureSeparation.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef curvatureSeparation_H
#define curvatureSeparation_H
 
#include "ejectionModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace filmEjectionModels
{
 
/*---------------------------------------------------------------------------*\
                     Class curvatureSeparation Declaration
\*---------------------------------------------------------------------------*/
 
class curvatureSeparation
:
    public ejectionModel
{
    // Private Member Data
 
        //- Gradient of film wall normals
        tensorField gradNHat_;
 
        //- Minimum gravity driven film thickness (non-dimensionalised delta/R1)
        scalar deltaByR1Min_;
 
        //- Stable film thickness - drips only formed if thickness
        //  exceeds this threshold value
        scalar deltaStable_;
 
        //- List of radii for patches
        //  if patch not listed the radius is calculated from the face normals
        List<Tuple2<label, scalar>> patchRadii_;
 
 
    // Protected Member Functions
 
        //- Calculate local (inverse) radius of curvature
        tmp<scalarField> calcInvR1(const volVectorField& U) const;
 
        //- Calculate the cosine of the angle between gravity vector and
        //  cell out flow direction
        tmp<scalarField> calcCosAngle(const surfaceScalarField& phi) const;
 
 
public:
 
    //- Runtime type information
    TypeName("curvatureSeparation");
 
 
    // Constructors
 
        //- Construct from dictionary and film model
        curvatureSeparation
        (
            const dictionary& dict,
            const solvers::isothermalFilm& film
        );
 
        //- Disallow default bitwise copy construction
        curvatureSeparation(const curvatureSeparation&) = delete;
 
 
    //- Destructor
    virtual ~curvatureSeparation();
 
 
    // Member Functions
 
        //- Correct
        virtual void correct();
 
 
        // Mesh changes
 
            //- Update topology using the given map
            virtual void topoChange(const polyTopoChangeMap&);
 
            //- Update from another mesh using the given map
            virtual void mapMesh(const polyMeshMap&);
 
            //- Redistribute or update using the given distribution map
            virtual void distribute(const polyDistributionMap&);
 
            //- Update for mesh motion
            virtual bool movePoints();
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const curvatureSeparation&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace filmEjectionModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //