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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2023-2024 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::OUForce
Description
Calculates and applies the random OU (Ornstein-Uhlenbeck) process force to
the momentum equation for direct numerical simulation of boxes of isotropic
turbulence.
The energy spectrum is calculated and written at write-times which is
particularly useful to test and compare LES SGS models.
Note
This random OU process force uses a FFT to generate the force field which
is not currently parallelised. Also the mesh the FFT is applied to must
be isotropic and have a power of 2 cells in each direction.
Usage
Example usage:
\verbatim
OUForce
{
type OUForce;
libs ("librandomProcesses.so");
sigma 0.090295;
alpha 0.81532;
kUpper 10;
kLower 7;
}
\endverbatim
SourceFiles
OUForce.C
\*---------------------------------------------------------------------------*/
#ifndef OUForce_H
#define OUForce_H
#include "fvModel.H"
#include "Kmesh.H"
#include "OUprocess.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace fv
{
/*---------------------------------------------------------------------------*\
Class OUForce Declaration
\*---------------------------------------------------------------------------*/
class OUForce
:
public fvModel
{
// Private Data
//- Name of the velocity field
word UName_;
//- The wavenumber mesh used for the random OU process
Kmesh K_;
//- The random OU process force generator
OUprocess forceGen_;
// Private Member Functions
//- Non-virtual read
void readCoeffs(const dictionary& dict);
public:
//- Runtime type information
TypeName("OUForce");
// Constructors
//- Construct from explicit source name and mesh
OUForce
(
const word& name,
const word& modelType,
const fvMesh& mesh,
const dictionary& dict
);
//- Disallow default bitwise copy construction
OUForce(const OUForce&) = delete;
// Member Functions
// Checks
//- Return the list of fields for which the fvModel adds source term
// to the transport equation
virtual wordList addSupFields() const;
// Evaluate
//- Add explicit contribution to incompressible momentum equation
virtual void addSup
(
const volVectorField& field,
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&);
// IO
//- Read source dictionary
virtual bool read(const dictionary& dict);
//- Write energy spectrum
virtual bool write(const bool write = true) const;
// Member Operators
//- Disallow default bitwise assignment
void operator=(const OUForce&) = delete;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace fv
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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