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========= |
\\ / 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
\*---------------------------------------------------------------------------*/
#ifndef sectionalForceGraph_functionObject_H
#define sectionalForceGraph_functionObject_H
#include "sectionalForcesBase.H"
#include "coordSet.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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