| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 2018-2025 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::functionObjects::turbulenceIntensity | |
| Description | |
| Evaluates and writes the turbulence intensity field 'I'. | |
| The turbulence intensity field 'I' is the root-mean-square of the turbulent | |
| velocity fluctuations normalised by the local velocity magnitude: | |
| \f[ | |
| I \equiv \frac{\sqrt{\frac{2}{3}\, k}}{U} | |
| \f] | |
| To avoid spurious extrema and division by 0 I is limited to 1 where the | |
| velocity magnitude is less than the turbulent velocity fluctuations. | |
| Example of function object specification: | |
| \verbatim | |
| functions | |
| { | |
| . | |
| . | |
| . | |
| turbulenceIntensity | |
| { | |
| type turbulenceIntensity; | |
| libs ("libfieldFunctionObjects.so"); | |
| } | |
| . | |
| . | |
| . | |
| } | |
| \endverbatim | |
| or using the standard configuration file: | |
| \verbatim | |
| functions | |
| { | |
| . | |
| . | |
| . | |
| #includeFunc turbulenceIntensity | |
| . | |
| . | |
| . | |
| } | |
| \endverbatim | |
| See also | |
| Foam::functionObject | |
| Foam::functionObjects::fvMeshFunctionObject | |
| Foam::functionObjects::logFiles | |
| Foam::functionObjects::writeLocalObjects | |
| Foam::functionObjects::timeControl | |
| SourceFiles | |
| turbulenceIntensity.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace functionObjects | |
| { | |
| /*---------------------------------------------------------------------------*\ | |
| Class turbulenceIntensity Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class turbulenceIntensity | |
| : | |
| public fvMeshFunctionObject, | |
| public logFiles, | |
| public writeLocalObjects | |
| { | |
| // Private Member Functions | |
| //- File header information | |
| virtual void writeFileHeader(const label i); | |
| public: | |
| //- Runtime type information | |
| TypeName("turbulenceIntensity"); | |
| // Constructors | |
| //- Construct from Time and dictionary | |
| turbulenceIntensity | |
| ( | |
| const word& name, | |
| const Time& runTime, | |
| const dictionary& dict | |
| ); | |
| //- Disallow default bitwise copy construction | |
| turbulenceIntensity(const turbulenceIntensity&) = delete; | |
| //- Destructor | |
| virtual ~turbulenceIntensity(); | |
| // Member Functions | |
| //- Read the turbulenceIntensity data | |
| virtual bool read(const dictionary&); | |
| //- Return the list of fields required | |
| virtual wordList fields() const | |
| { | |
| return wordList::null(); | |
| } | |
| //- Calculate the turbulenceIntensity field | |
| virtual bool execute(); | |
| //- Write the turbulenceIntensity field | |
| virtual bool write(); | |
| // Member Operators | |
| //- Disallow default bitwise assignment | |
| void operator=(const turbulenceIntensity&) = delete; | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace functionObjects | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |