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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::rigidBodySectionalForceGraph
Description
This function calculates the fluid and acceleration forces and moments at a
series of section-planes through a given rigid body. It writes the result
into a graph which can be used to construct (potentially just a 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 as normal to an axis in the local coordinate
system of the rigid body, and the line of the graph extends along the axis
from an origin defined in the same local coordinate system. Forces and
moments are calculated on the side of the plane on which coordinates have a
positive axis-component.
Note that this function does not take into account the effect of joints or
restraints attached to the body, so if these are applied then the shear
force and bending moment diagrams generated will be somewhat incomplete.
Note that ramping, acceleration relaxation, and solution tolerance can also
result in components of the forces and moments to be missing from the
output.
Example of function object specification:
\verbatim
rigidBodySectionalForceGraph
{
type rigidBodySectionalForceGraph;
libs ("librigidBodyForces.so");
body beam;
patches (beam);
axis x;
nPoints 101;
setFormat raw;
writeControl writeTime;
}
\endverbatim
Usage
\table
Property | Description | Required | Default value
type | Type name: rigidBodySectionalForceGraph | yes |
body | The name of the rigid body | yes |
patches | Patches included in the forces calculation | yes |
axis | Local axis normal to the section planes | yes |
origin | Local origin of the plot | no | body centroid
nPoints | Number of points in the plot | 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
rigidBodySectionalForceGraph.C
\*---------------------------------------------------------------------------*/
#ifndef rigidBodySectionalForceGraph_functionObject_H
#define rigidBodySectionalForceGraph_functionObject_H
#include "rigidBodySectionalForcesBase.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace functionObjects
{
/*---------------------------------------------------------------------------*\
Class rigidBodySectionalForceGraph Declaration
\*---------------------------------------------------------------------------*/
class rigidBodySectionalForceGraph
:
public rigidBodySectionalForcesBase
{
// Private Data
//- The distances from the origin to the section planes
mutable autoPtr<scalarField> distancesPtr_;
//- The number of points in the plot
label nPoints_;
//- File writer
autoPtr<setWriter> formatter_;
//- Number of optimisation iterations. Default is 2.
label nOptimiseIter_;
// Private Member Functions
//- Clear the cached weights
virtual void clear();
//- Return the distances from the origin to the section planes
virtual tmp<scalarField> distances() const;
public:
//- Runtime type information
TypeName("rigidBodySectionalForceGraph");
// Constructors
//- Construct from Time and dictionary
rigidBodySectionalForceGraph
(
const word& name,
const Time& runTime,
const dictionary& dict
);
//- Disallow default bitwise copy construction
rigidBodySectionalForceGraph
(
const rigidBodySectionalForceGraph&
) = delete;
//- Destructor
virtual ~rigidBodySectionalForceGraph();
// Member Functions
//- Read the rigidBodySectionalForceGraph data
virtual bool read(const dictionary&);
//- Write the rigidBodySectionalForceGraph
virtual bool write();
// Member Operators
//- Disallow default bitwise assignment
void operator=(const rigidBodySectionalForceGraph&) = delete;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace functionObjects
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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