| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / 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 | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| 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 | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |