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316 lines
8.7 KiB
C++
316 lines
8.7 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::functionObjects::forces
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Group
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grpForcesFunctionObjects
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Description
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Calculates the forces and moments by integrating the pressure and
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skin-friction forces over a given list of patches.
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Member function forces::write() calculates the forces/moments and
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writes the forces/moments into the file \<timeDir\>/forces.dat and bin
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data (if selected) to the file \<timeDir\>/forces_bin.dat
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Example of function object specification:
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\verbatim
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forces1
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{
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type forces;
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libs ("libforces.so");
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...
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log yes;
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patches (walls);
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binData
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{
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nBin 20;
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direction (1 0 0);
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cumulative yes;
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}
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}
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\endverbatim
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Usage
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\table
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Property | Description | Required | Default value
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type | Type name: forces | yes |
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log | Write force data to standard output | no | no
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patches | Patches included in the forces calculation | yes |
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p | Pressure field name | no | p
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U | Velocity field name | no | U
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rho | Density field name (see below) | no | rho
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CofR | Centre of rotation (see below) | no |
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directForceDensity | Force density supplied directly (see below)|no|no
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fD | Name of force density field (see below) | no | fD
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\endtable
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Bin data is optional, but if the dictionary is present, the entries must
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be defined according o
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\table
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nBin | number of data bins | yes |
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direction | direction along which bins are defined | yes |
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cumulative | bin data accumulated with incresing distance | yes |
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\endtable
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Note
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- For incompressible cases, set \c rho to \c rhoInf. You will then be
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required to provide a \c rhoInf value corresponding to the free-stream
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constant density.
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- If the force density is supplied directly, set the \c directForceDensity
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flag to 'yes', and supply the force density field using the \c
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fDName entry
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- The centre of rotation (CofR) for moment calculations can either be
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specified by an \c CofR entry, or be taken from origin of the local
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coordinate system. For example,
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\verbatim
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CofR (0 0 0);
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\endverbatim
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or
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\verbatim
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coordinateSystem
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{
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origin (0 0 0);
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e3 (0 0 1);
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e1 (1 0 0);
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}
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\endverbatim
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See also
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Foam::functionObject
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Foam::functionObjects::writeFiles
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Foam::functionObjects::timeControl
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Foam::forceCoeffs
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SourceFiles
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forces.C
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\*---------------------------------------------------------------------------*/
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#ifndef functionObjects_forces_H
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#define functionObjects_forces_H
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#include "writeFiles.H"
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#include "coordinateSystem.H"
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#include "volFieldsFwd.H"
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#include "HashSet.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace functionObjects
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{
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/*---------------------------------------------------------------------------*\
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Class forces Declaration
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\*---------------------------------------------------------------------------*/
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class forces
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:
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public writeFiles
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{
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protected:
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// Protected data
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//- Pressure, viscous and porous force per bin
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List<Field<vector>> force_;
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//- Pressure, viscous and porous moment per bin
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List<Field<vector>> moment_;
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// Read from dictionary
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//- Patches to integrate forces over
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labelHashSet patchSet_;
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//- Name of pressure field
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word pName_;
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//- Name of velocity field
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word UName_;
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//- Name of density field (optional)
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word rhoName_;
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//- Is the force density being supplied directly?
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Switch directForceDensity_;
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//- The name of the force density (fD) field
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word fDName_;
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//- Reference density needed for incompressible calculations
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scalar rhoRef_;
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//- Reference pressure
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scalar pRef_;
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//- Coordinate system used when evaluting forces/moments
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coordinateSystem coordSys_;
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//- Flag to indicate whether we are using a local co-ordinate sys
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bool localSystem_;
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//- Flag to include porosity effects
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bool porosity_;
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// Bin information
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//- Number of bins
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label nBin_;
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//- Direction used to determine bin orientation
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vector binDir_;
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//- Distance between bin divisions
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scalar binDx_;
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//- Minimum bin bounds
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scalar binMin_;
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//- Bin positions along binDir
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List<point> binPoints_;
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//- Should bin data be cumulative?
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bool binCumulative_;
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//- Initialised flag
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bool initialised_;
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// Protected Member Functions
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//- Create file names for forces and bins
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wordList createFileNames(const dictionary& dict) const;
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//- Output file header information
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virtual void writeFileHeader(const label i);
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//- Initialise the fields
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void initialise();
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//- Return the effective viscous stress (laminar + turbulent).
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tmp<volSymmTensorField> devRhoReff() const;
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//- Dynamic viscosity field
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tmp<volScalarField> mu() const;
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//- Return rho if specified otherwise rhoRef
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tmp<volScalarField> rho() const;
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//- Return rhoRef if the pressure field is dynamic, i.e. p/rho
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// otherwise return 1
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scalar rho(const volScalarField& p) const;
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//- Accumulate bin data
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void applyBins
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(
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const vectorField& Md,
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const vectorField& fN,
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const vectorField& fT,
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const vectorField& fP,
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const vectorField& d
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);
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//- Helper function to write force data
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void writeForces();
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//- Helper function to write bin data
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void writeBins();
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//- Disallow default bitwise copy construct
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forces(const forces&);
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//- Disallow default bitwise assignment
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void operator=(const forces&);
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public:
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//- Runtime type information
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TypeName("forces");
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// Constructors
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//- Construct from Time and dictionary
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forces
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(
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const word& name,
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const Time& runTime,
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const dictionary& dict
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);
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//- Construct from objectRegistry and dictionary
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forces
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(
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const word& name,
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const objectRegistry& obr,
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const dictionary&
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);
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//- Destructor
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virtual ~forces();
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// Member Functions
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//- Read the forces data
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virtual bool read(const dictionary&);
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//- Calculate the forces and moments
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virtual void calcForcesMoment();
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//- Return the total force
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virtual vector forceEff() const;
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//- Return the total moment
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virtual vector momentEff() const;
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//- Execute, currently does nothing
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virtual bool execute();
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//- Write the forces
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virtual bool write();
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace functionObjects
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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