thermoSingleLayer.H

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    Copyright (C) 2011-2017 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
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Class
    Foam::regionModels::surfaceFilmModels::thermoSingleLayer
 
Description
    Thermodynamic form of single-cell layer surface film model
 
    Note: defining enthalpy as Cp(T - Tstd) - when using liquids from the
    thermophysical library, their enthalpies are calculated similarly, where
    Tstd = 298.15K.  This is clearly non-conservative unless the heat-capacity
    is constant and should be rewritten to use the standard thermodynamics
    packages.
 
SourceFiles
    thermoSingleLayer.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef thermoSingleLayer_H
#define thermoSingleLayer_H
 
#include "kinematicSingleLayer.H"
#include "SLGThermo.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace regionModels
{
namespace surfaceFilmModels
{
 
// Forward declaration of classes
class filmViscosityModel;
class heatTransferModel;
class phaseChangeModel;
class filmRadiationModel;
 
/*---------------------------------------------------------------------------*\
                      Class thermoSingleLayer Declaration
\*---------------------------------------------------------------------------*/
 
class thermoSingleLayer
:
    public kinematicSingleLayer
{
    // Private member functions
 
        //- No copy construct
        thermoSingleLayer(const thermoSingleLayer&) = delete;
 
        //- No copy assignment
        void operator=(const thermoSingleLayer&) = delete;
 
        //- Return boundary types for sensible enthalpy field
        wordList hsBoundaryTypes();
 
 
protected:
 
    // Protected data
 
        // Thermo properties
 
            //- Reference to the SLGThermo
            const SLGThermo& thermo_;
 
 
            // Fields
 
                //- Specific heat capacity [J/kg/K]
                volScalarField Cp_;
 
                //- Thermal conductivity [W/m/K]
                volScalarField kappa_;
 
                //- Temperature - mean [K]
                volScalarField T_;
 
                //- Temperature - surface [K]
                volScalarField Ts_;
 
                //- Temperature - wall [K]
                volScalarField Tw_;
 
                //- Sensible enthalpy [J/kg]
                volScalarField hs_;
 
 
            // Transfer fields - to the primary region
 
                //- Film energy transfer
                volScalarField primaryEnergyTrans_;
 
 
        //- Threshold film thickness beyond which the film is considered 'wet'
        scalar deltaWet_;
 
 
        // Hydrophilic/phobic properties
 
            //- Activation flag
            bool hydrophilic_;
 
            //- Length scale applied to deltaWet_ to determine when a wet
            //  surface becomes dry, typically 0.5
            scalar hydrophilicDryScale_;
 
            //- Length scale applied to deltaWet_ to determine when a dry
            //  surface becomes wet, typically 0.001
            scalar hydrophilicWetScale_;
 
 
        // Source term fields
 
            // Film region - registered to the film region mesh
            // Note: need boundary value mapped from primary region, and then
            // pushed into the patch internal field
 
                //- Energy [J/m2/s]
                volScalarField hsSp_;
 
 
            // Primary region - registered to the primary region mesh
            // Internal use only - not read-in
 
                //- Energy [J/m2/s]
                volScalarField hsSpPrimary_;
 
 
        // Fields mapped from primary region - registered to the film region
        // Note: need both boundary AND patch internal fields to be mapped
 
            //- Temperature [K]
            volScalarField TPrimary_;
 
            //- List of specie mass fractions [0-1]
            PtrList<volScalarField> YPrimary_;
 
 
        // Sub-models
 
            //- Viscosity model
            autoPtr<filmViscosityModel> viscosity_;
 
            //- Heat transfer coefficient between film surface and primary
            //  region [W/m2/K]
            autoPtr<heatTransferModel> htcs_;
 
            //- Heat transfer coefficient between wall and film [W/m2/K]
            autoPtr<heatTransferModel> htcw_;
 
            //- Phase change
            autoPtr<phaseChangeModel> phaseChange_;
 
            //- Radiation
            autoPtr<filmRadiationModel> radiation_;
 
 
        // Limits
 
            //- Minimum temperature limit (optional)
            scalar Tmin_;
 
            //- Maximum temperature limit (optional)
            scalar Tmax_;
 
 
    // Protected member functions
 
        //- Read control parameters from dictionary
        virtual bool read();
 
        //- Correct the thermo fields
        virtual void correctThermoFields();
 
        //- Correct sensible enthalpy for mapped temperature fields
        virtual void correctHsForMappedT();
 
        //- Correct the film surface and wall temperatures
        virtual void updateSurfaceTemperatures();
 
        //- Reset source term fields
        virtual void resetPrimaryRegionSourceTerms();
 
        //- Transfer thermo fields from the primary region to the film region
        virtual void transferPrimaryRegionThermoFields();
 
        //- Transfer source fields from the primary region to the film region
        virtual void transferPrimaryRegionSourceFields();
 
        //- Correct film coverage field
        virtual void correctAlpha();
 
        //- Update the film sub-models
        virtual void updateSubmodels();
 
        //- Return the wall/surface heat transfer term for the enthalpy equation
        virtual tmp<fvScalarMatrix> q(volScalarField& hs) const;
 
 
        // Equations
 
            //- Solve energy equation
            virtual void solveEnergy();
 
 
public:
 
    //- Runtime type information
    TypeName("thermoSingleLayer");
 
 
    // Constructors
 
        //- Construct from components
        thermoSingleLayer
        (
            const word& modelType,
            const fvMesh& mesh,
            const dimensionedVector& g,
            const word& regionType,
            const bool readFields = true
        );
 
 
    //- Destructor
    virtual ~thermoSingleLayer();
 
 
    // Member Functions
 
        // Thermo properties
 
            //- Return const reference to the SLGThermo object
            inline const SLGThermo& thermo() const;
 
 
            // Fields
 
                //- Return the film specific heat capacity [J/kg/K]
                virtual const volScalarField& Cp() const;
 
                //- Return the film thermal conductivity [W/m/K]
                virtual const volScalarField& kappa() const;
 
                //- Return the film mean temperature [K]
                virtual const volScalarField& T() const;
 
                //- Return the film surface temperature [K]
                virtual const volScalarField& Ts() const;
 
                //- Return the film wall temperature [K]
                virtual const volScalarField& Tw() const;
 
                //- Return the film sensible enthalpy [J/kg]
                virtual const volScalarField& hs() const;
 
 
            // Helper functions
 
                //- Return sensible enthalpy as a function of temperature
                //  for a patch
                inline tmp<scalarField> hs
                (
                    const scalarField& T,
                    const label patchi
                ) const;
 
                //- Return sensible enthalpy as a function of temperature
                inline tmp<volScalarField> hs
                (
                    const volScalarField& T
                ) const;
 
                //- Return temperature as a function of sensible enthalpy
                inline tmp<volScalarField> T
                (
                    const volScalarField& hs
                ) const;
 
 
         // Source fields (read/write access)
 
            //- External hook to add sources to the film
            virtual void addSources
            (
                const label patchi,            // patchi on primary region
                const label facei,             // facei of patchi
                const scalar massSource,       // [kg]
                const vector& momentumSource,  // [kg.m/s] (tangential momentum)
                const scalar pressureSource,   // [kg.m/s] (normal momentum)
                const scalar energySource      // [J]
            );
 
 
        // Source term fields
 
            // Film region
 
                //- Energy [J/m2/s]
                inline const volScalarField& hsSp() const;
 
 
            // Primary region
 
                //- Energy [J/m2/s]
                inline const volScalarField& hsSpPrimary() const;
 
 
        // Fields mapped from the primary region
 
            //- Temperature [K]
            inline const volScalarField& TPrimary() const;
 
            //- Specie mass fractions [0-1]
            inline const PtrList<volScalarField>& YPrimary() const;
 
 
 
        // Sub-models
 
            //- Return const access to the (surface) heat transfer model
            inline const heatTransferModel& htcs() const;
 
            //- Return const access to the (wall) heat transfer model
            inline const heatTransferModel& htcw() const;
 
            //- Return const access to the phase change model
            inline const phaseChangeModel& phaseChange() const;
 
            //- Return const access to the radiation model
            inline const filmRadiationModel& radiation() const;
 
 
        // Derived fields (calculated on-the-fly)
 
            //- Return the convective heat energy from film to wall
            inline tmp<scalarField> qconvw(const label patchi) const;
 
            //- Return the convective heat energy from primary region to film
            inline tmp<scalarField> qconvp(const label patchi) const;
 
 
        // Evolution
 
            //- Pre-evolve film hook
            virtual void preEvolveRegion();
 
            //- Evolve the film equations
            virtual void evolveRegion();
 
 
        // Source fields
 
            // Mapped into primary region
 
                //- Return total mass source - Eulerian phase only
                virtual tmp<volScalarField::Internal> Srho() const;
 
                //- Return mass source for specie i - Eulerian phase only
                virtual tmp<volScalarField::Internal> Srho
                (
                    const label i
                ) const;
 
                //- Return enthalpy source - Eulerian phase only
                virtual tmp<volScalarField::Internal> Sh() const;
 
 
       // I-O
 
            //- Provide some feedback
            virtual void info();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace surfaceFilmModels
} // End namespace regionModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "thermoSingleLayerI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //