| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 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::functionObjects::sectionalForceGraph | |
| Description | |
| This function calculates the fluid forces and moments at a series of | |
| section-planes through a given set of patches. It writes the result into a | |
| graph which can be used to construct part of a shear force and bending | |
| moment diagram. Points in the graph are graded to approximately match the | |
| resolution of the mesh. | |
| The cut-planes are defined by a normal, and the line of the graph is | |
| defined by an origin and extends in the direction of the normal. Forces and | |
| moments are calculated on the side of the planes to which the normal | |
| points. If the "other" side also needs to be generated then the function | |
| can be executed with the normal reversed. | |
| Note that to construct full shear force and bending moment diagrams would | |
| require supporting and/or dynamic forces to be included also. This function | |
| only generates the contribution from the surrounding fluid. | |
| Example of function object specification: | |
| \verbatim | |
| sectionalForceGraph1 | |
| { | |
| type sectionalForceGraph; | |
| libs ("libforces.so"); | |
| patches (hull); | |
| origin (0 0 0); | |
| normal (1 0 0); | |
| nPoints 20; | |
| axis x; | |
| setFormat raw; | |
| } | |
| \endverbatim | |
| Usage | |
| \table | |
| Property | Description | Required | Default value | |
| type | Type name: sectionalForceGraph | yes | | |
| patches | Patches included in the forces calculation | yes | | |
| origin | Origin of the plot | yes | | |
| normal | Normal to the section planes | yes | | |
| nPoints | Number of points in the plot | yes | | |
| axis | Component of the position to plot against | yes | | |
| setFormat | Graph output format | yes | | |
| p | Pressure field name | no | p | |
| U | Velocity field name | no | U | |
| rho | Density field name | no | rho | |
| phase | Phase name for phase-fraction | no | | |
| rhoRef | Reference density | if incompressible | | |
| pRef | Reference pressure | no | 0 | |
| \endtable | |
| SourceFiles | |
| sectionalForceGraph.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace functionObjects | |
| { | |
| /*---------------------------------------------------------------------------*\ | |
| Class sectionalForceGraph Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class sectionalForceGraph | |
| : | |
| public sectionalForcesBase | |
| { | |
| // Private Data | |
| //- The normal to the selection planes | |
| vector normal_; | |
| //- The origin of the plot | |
| vector origin_; | |
| //- The distances from the origin to the section planes | |
| mutable autoPtr<scalarField> distancesPtr_; | |
| //- The number of points in the plot | |
| label nPoints_; | |
| //- The direction over which to plot the results | |
| coordSet::axisType axis_; | |
| //- File writer | |
| autoPtr<setWriter> formatter_; | |
| //- Number of optimisation iterations. Default is 2. | |
| label nOptimiseIter_; | |
| // Private Member Functions | |
| //- Clear the cached weights | |
| virtual void clear(); | |
| protected: | |
| // Protected Member Functions | |
| //- Return the normal to the section planes | |
| virtual vector normal() const; | |
| //- Return the origin of the plot | |
| virtual point origin() const; | |
| //- Return the distances from the origin to the section planes | |
| virtual tmp<scalarField> distances() const; | |
| public: | |
| //- Runtime type information | |
| TypeName("sectionalForceGraph"); | |
| // Constructors | |
| //- Construct from Time and dictionary | |
| sectionalForceGraph | |
| ( | |
| const word& name, | |
| const Time& runTime, | |
| const dictionary& dict | |
| ); | |
| //- Disallow default bitwise copy construction | |
| sectionalForceGraph(const sectionalForceGraph&) = delete; | |
| //- Destructor | |
| virtual ~sectionalForceGraph(); | |
| // Member Functions | |
| //- Read the sectionalForceGraph data | |
| virtual bool read(const dictionary&); | |
| //- Write the sectionalForceGraph | |
| virtual bool write(); | |
| // Member Operators | |
| //- Disallow default bitwise assignment | |
| void operator=(const sectionalForceGraph&) = delete; | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace functionObjects | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |