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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::sectionalForceProbes
Description
This function calculates the fluid forces and moments at a number of
section-planes through a given set of patches. It writes the result into a
log file.
The cut-planes are defined by a single normal and a number of points.
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 this function only generates the contribution from the fluid to
the sectional forces and moments in the object. To compute the complete
sectional force would require supporting and/or dynamic forces to be
included also.
Example of function object specification:
\verbatim
sectionalForceProbes1
{
type sectionalForceProbes;
libs ("libforces.so");
patches (hull);
points
(
(-0.8 0 0)
( 0 0 0)
( 0.8 0 0)
);
normal (1 0 0);
}
\endverbatim
Usage
\table
Property | Description | Required | Default value
type | Type name: sectionalForceProbes | yes |
patches | Patches included in the forces calculation | yes |
points | Points in the cut-planes | yes |
normal | Normal to the cut-planes | 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
sectionalForceProbes.C
\*---------------------------------------------------------------------------*/
#ifndef sectionalForceProbes_functionObject_H
#define sectionalForceProbes_functionObject_H
#include "sectionalForcesBase.H"
#include "logFiles.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace functionObjects
{
/*---------------------------------------------------------------------------*\
Class sectionalForceProbes Declaration
\*---------------------------------------------------------------------------*/
class sectionalForceProbes
:
public sectionalForcesBase,
public logFiles
{
// Private Data
//- The normal to the selection planes
vector normal_;
//- Points in the section planes
Field<point> points_;
//- The order the points when sorted by distance in the normal
labelList pointOrders_;
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;
//- Output file header information
virtual void writeFileHeader(const label i = 0);
public:
//- Runtime type information
TypeName("sectionalForceProbes");
// Constructors
//- Construct from Time and dictionary
sectionalForceProbes
(
const word& name,
const Time& runTime,
const dictionary& dict
);
//- Disallow default bitwise copy construction
sectionalForceProbes(const sectionalForceProbes&) = delete;
//- Destructor
virtual ~sectionalForceProbes();
// Member Functions
//- Read the sectionalForceProbes data
virtual bool read(const dictionary&);
//- Write the sectionalForceProbes
virtual bool write();
// Member Operators
//- Disallow default bitwise assignment
void operator=(const sectionalForceProbes&) = delete;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace functionObjects
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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