| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 2024-2025 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::movingForces | |
| Description | |
| Calculates the forces and moments by integrating the pressure and | |
| skin-friction forces over a given list of patches of a moving object. | |
| The centre of rotation (CofR) of the moving object is specified as a | |
| Foam::Function1<vector> of time. | |
| Member function movingForces::write() calculates the forces/moments and | |
| writes the forces/moments into the file \<timeDir\>/movingForces.dat and bin | |
| data (if selected) to the file \<timeDir\>/movingForces_bin.dat | |
| Example of function object specification: | |
| \verbatim | |
| movingForces1 | |
| { | |
| type movingForces; | |
| libs ("libforces.so"); | |
| log yes; | |
| patches (walls); | |
| CofR | |
| { | |
| type sine; | |
| amplitude (0 0.025 0); | |
| frequency 1; | |
| start 0; | |
| level (0 0 0); | |
| } | |
| } | |
| \endverbatim | |
| Usage | |
| \table | |
| Property | Description | Required | Default value | |
| type | Type name: movingForces | yes | | |
| log | Write force data to standard output | no | no | |
| patches | Patches included in the forces calculation | yes | | |
| p | Pressure field name | no | p | |
| U | Velocity field name | no | U | |
| rho | Density field name (see below) | no | rho | |
| phase | Phase name for phase-fraction | no | | |
| CofR | Centre of rotation Foam::Function1<vector> | yes | | |
| directForceDensity | Force density supplied directly (see below)|no|no | |
| fD | Name of force density field (see below) | no | fD | |
| \endtable | |
| Bin data is optional, but if the dictionary is present, the entries must | |
| be defined according o | |
| \table | |
| nBin | number of data bins | yes | | |
| direction | direction along which bins are defined | yes | | |
| cumulative | bin data accumulated with increasing distance | yes | | |
| \endtable | |
| Note | |
| - For incompressible cases, set \c rho to \c rhoInf and provide | |
| a \c rhoInf value corresponding to the free-stream constant density. | |
| - If the \c phase name is specified the corresponding phase-fraction field | |
| \c alpha.\<phase\> is used to filter the surface force field | |
| before integration. | |
| - If the force density is supplied directly, set the \c directForceDensity | |
| flag to 'yes', and supply the force density field using the \c | |
| fDName entry | |
| See also | |
| Foam::functionObject | |
| Foam::functionObjects::forcesBase | |
| Foam::functionObjects::fvMeshFunctionObject | |
| Foam::functionObjects::logFiles | |
| Foam::functionObjects::timeControl | |
| Foam::Function1 | |
| SourceFiles | |
| movingForces.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace functionObjects | |
| { | |
| /*---------------------------------------------------------------------------*\ | |
| Class movingForces Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class movingForces | |
| : | |
| public forcesBase | |
| { | |
| protected: | |
| // Protected data | |
| //- Centre of rotation | |
| autoPtr<Function1<vector>> CofR_; | |
| // Protected Member Functions | |
| //- Return the current centre of the rigid body | |
| virtual vector CofR() const; | |
| public: | |
| //- Runtime type information | |
| TypeName("movingForces"); | |
| // Constructors | |
| //- Construct from Time and dictionary | |
| movingForces | |
| ( | |
| const word& name, | |
| const Time& runTime, | |
| const dictionary& dict | |
| ); | |
| //- Construct from objectRegistry and dictionary | |
| movingForces | |
| ( | |
| const word& name, | |
| const objectRegistry& obr, | |
| const dictionary& | |
| ); | |
| //- Disallow default bitwise copy construction | |
| movingForces(const movingForces&) = delete; | |
| //- Destructor | |
| virtual ~movingForces(); | |
| // Member Functions | |
| //- Read the forces data | |
| virtual bool read(const dictionary&); | |
| // Member Operators | |
| //- Disallow default bitwise assignment | |
| void operator=(const movingForces&) = delete; | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace functionObjects | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |