curvatureSeparation.H

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    Copyright (C) 2021 OpenCFD Ltd.
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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.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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    You should have received a copy of the GNU General Public License
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Class
    Foam::regionModels::areaSurfaceFilmModels::curvatureSeparation
 
Description
    Curvature film separation model
 
    Assesses film curvature via the mesh geometry and calculates a force
    balance of the form:
 
        F_sum = F_inertial + F_body + F_surface
 
    If F_sum < 0, the film separates. Similarly, if F_sum > 0 the film will
    remain attached.
 
    Based on description given by
        Owen and D. J. Ryley. The flow of thin liquid films around corners.
        International Journal of Multiphase Flow, 11(1):51-62, 1985.
 
SourceFiles
    curvatureSeparation.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef curvatureSeparation_H
#define curvatureSeparation_H
 
#include "injectionModel.H"
#include "faCFD.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace areaSurfaceFilmModels
{
 
/*---------------------------------------------------------------------------*\
                   Class curvatureSeparation Declaration
\*---------------------------------------------------------------------------*/
 
class curvatureSeparation
:
    public injectionModel
{
    // Private Member Functions
 
        //- No copy construct
        curvatureSeparation(const curvatureSeparation&) = delete;
 
        //- No copy assignment
        void operator=(const curvatureSeparation&) = delete;
 
 
protected:
 
    // Protected Data
 
        //- Gradient of surface normals
        areaTensorField gradNHat_;
 
        //- Minimum gravity driven film thickness (non-dimensionalised delta/R1)
        scalar deltaByR1Min_;
 
        //- List of radii for patches - if patch not defined, radius
        //- calculated based on mesh geometry
        scalar definedPatchRadii_;
 
        //- Magnitude of gravity vector
        scalar magG_;
 
        //- Direction of gravity vector
        vector gHat_;
 
        //- Threshold force for separation
        scalar fThreshold_;
 
        //- Minimum inv R1 for separation
        scalar minInvR1_;
 
 
    // Protected Member Functions
 
        //- Calculate local (inverse) radius of curvature
        tmp<areaScalarField> calcInvR1
        (
            const areaVectorField& U,
            const scalarField& calcCosAngle
        ) const;
 
        //- Calculate the cosine of the angle between gravity vector and
        //- cell out flow direction
        tmp<scalarField> calcCosAngle(const edgeScalarField& phi) const;
 
 
public:
 
    //- Runtime type information
    TypeName("curvatureSeparation");
 
 
    // Constructors
 
        //- Construct from surface film model
        curvatureSeparation
        (
            liquidFilmBase& film,
            const dictionary& dict
        );
 
 
    //- Destructor
    virtual ~curvatureSeparation() = default;
 
 
    // Member Functions
 
        // Evolution
 
            //- Correct
            virtual void correct
            (
                scalarField& availableMass,
                scalarField& massToInject,
                scalarField& diameterToInject
            );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace areaSurfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //