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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2021-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
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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for more details.
You should have received a copy of the GNU General Public License
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Class
Foam::fv::coefficientPhaseChange
Description
This simple model generates a phase change between two phases calculated
from the following expression:
\f[
\dot{m}/V = C \alpha \grad \alpha
\f]
\vartable
\dot{m}/V | mass transfer rate per unit volume
C | coefficient
\alpha | volume fraction of the source phase
\endvartable
Usage
Example usage:
\verbatim
coefficientPhaseChange
{
type coefficientPhaseChange;
phases (liquid vapour);
C [kg/m^2/s] 0.1;
}
\endverbatim
SourceFiles
coefficientPhaseChange.C
\*---------------------------------------------------------------------------*/
#ifndef coefficientPhaseChange_H
#define coefficientPhaseChange_H
#include "phaseChange.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace fv
{
/*---------------------------------------------------------------------------*\
Class coefficientPhaseChange Declaration
\*---------------------------------------------------------------------------*/
class coefficientPhaseChange
:
public phaseChange
{
private:
// Private Data
//- Phase change coefficient. Multiplies the estimated interfacial
// area density return the phase change rate. Units of [kg/m^2/s].
dimensionedScalar C_;
//- The source phase fraction field
const volScalarField& alpha1_;
// Private Member Functions
//- Non-virtual read
void readCoeffs(const dictionary& dict);
//- Multiply the argument by the mass fraction of transferring species
// in the source phase
tmp<DimensionedField<scalar, fvMesh>> timesY1
(
tmp<DimensionedField<scalar, fvMesh>> mDot
) const;
//- Return the phase change rate with the source phase and mass
// fraction factored out
virtual tmp<DimensionedField<scalar, fvMesh>> mDotByAlpha1Y1() const;
public:
//- Runtime type information
TypeName("coefficientPhaseChange");
// Constructors
//- Construct from explicit source name and mesh
coefficientPhaseChange
(
const word& name,
const word& modelType,
const fvMesh& mesh,
const dictionary& dict
);
// Member Functions
// Sources
//- Return the total phase change rate
virtual tmp<DimensionedField<scalar, fvMesh>> mDot() const;
//- Return the phase change rate of a specie
virtual tmp<DimensionedField<scalar, fvMesh>> mDot
(
const label mDoti
) const;
//- Override the compressible continuity equation to add
// linearisation w.r.t alpha
void addSup
(
const volScalarField& alpha,
const volScalarField& rho,
fvMatrix<scalar>& eqn
) const;
//- Override the compressible mass fraction equation to add
// linearisation w.r.t the mass fraction
void addSup
(
const volScalarField& alpha,
const volScalarField& rho,
const volScalarField& Yi,
fvMatrix<scalar>& eqn
) const;
//- Read source dictionary
virtual bool read(const dictionary& dict);
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace fv
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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