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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2022-2026 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
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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::fv::waveForcing
Description
This fvModel applies forcing to the liquid phase-fraction field and all
components of the vector field to relax the fields towards those
calculated from the current wave distribution.
The force coefficient \f$\lambda\f$ should be set based on the desired level
of forcing and the residence time the waves through the forcing zone. For
example, if waves moving at 2 [m/s] are travelling through a forcing zone 8
[m] in length, then the residence time is 4 [s]. If it is deemed necessary
to force for 5 time-scales, then \f$\lambda\f$ should be set to equal 5/(4
[s]) = 1.2 [1/s]. If more aggressive forcing is required adjacent to the
boundaries, which is often the case if wave boundary conditions are
specified at outflow boundaries, the optional \c lambdaBoundary
coefficient can be specified higher than the value of \f$\lambda\f$.
Alternatively the forcing force coefficient \c lambdaCoeff can be
specified in which case \f$\lambda\f$ is evaluated by multiplying the
maximum wave speed by \c lambdaCoeff and dividing by the forcing region
length. \c lambdaBoundary is similarly evaluated from
\c lambdaBoundaryCoeff if specified.
Usage
Example usage:
\verbatim
waveForcing1
{
type waveForcing;
libs ("libwaves.so");
liquidPhase water;
// Define the line along which to apply the graduation
origin (600 0 0);
direction (-1 0 0);
// // Or, define multiple lines
// origins ((600 0 0) (600 -300 0) (600 300 0));
// directions ((-1 0 0) (0 1 0) (0 -1 0));
scale
{
type halfCosineRamp;
start 0;
duration 300;
}
lambdaCoeff 2; // Forcing coefficient
// lambdaBoundaryCoeff 10; // Optional boundary forcing coefficient
// Useful when wave BCs are specified at outlets
// Write the forcing fields: forcing:scale, forcing:forceCoeff
writeForceFields true;
}
\endverbatim
See also
Foam::fv::forcing
SourceFiles
waveForcing.C
\*---------------------------------------------------------------------------*/
#ifndef waveForcing_H
#define waveForcing_H
#include "forcing.H"
#include "waveSuperposition.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace fv
{
/*---------------------------------------------------------------------------*\
Class waveForcing Declaration
\*---------------------------------------------------------------------------*/
class waveForcing
:
public forcing
{
// Private Data
scalar lambdaCoeff_;
scalar lambdaBoundaryCoeff_;
dimensionedScalar regionLength_;
//- Reference to the waves
const waveSuperposition& waves_;
//- Name of the liquid phase
const word liquidPhaseName_;
//- Name of the liquid phase-fraction field
const word alphaName_;
//- Name of the velocity field
const word UName_;
//- Phase-fraction field calculated from the current wave form
tmp<volInternalScalarField> alphaWaves_;
//- Velocity field calculated from the current wave form
tmp<volInternalVectorField> Uwaves_;
//- Forcing coefficient scale field
autoPtr<volInternalScalarField> scale_;
// Private Member Functions
//- Non-virtual read
void readCoeffs(const dictionary& dict);
//- Return the scale distribution
virtual tmp<volInternalScalarField> scale() const;
//- Return the force coefficient
virtual tmp<volInternalScalarField> forceCoeff() const;
public:
//- Runtime type information
TypeName("waveForcing");
// Constructors
//- Construct from components
waveForcing
(
const word& name,
const word& modelType,
const fvMesh& mesh,
const dictionary& dict
);
//- Destructor
virtual ~waveForcing()
{}
// Member Functions
//- Read dictionary
virtual bool read(const dictionary& dict);
// Checks
//- Return the list of fields for which the fvModel adds source term
// to the transport equation
virtual wordList addSupFields() const;
// Add explicit and implicit contributions
//- Source term to VoF phase-fraction equation
virtual void addSup
(
const volScalarField& alpha,
fvMatrix<scalar>& eqn
) const;
//- Source term to momentum equation
virtual void addSup
(
const volScalarField& rho,
const volVectorField& U,
fvMatrix<vector>& eqn
) const;
// Mesh changes
//- Update for mesh motion
virtual bool movePoints();
//- 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&);
//- Correct the wave forcing coefficients
virtual void correct();
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace fv
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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