forceCoeffs.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
-------------------------------------------------------------------------------
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::forceCoeffs
 
Group
    grpForcesFunctionObjects
 
Description
    This function object extends the Foam::forces function object by providing
    lift, drag and moment coefficients.  The data can optionally be output into
    bins, defined in a given direction.
 
    The binned data provides the total and consitituentcomponents per bin:
    - total coefficient
    - pressure coefficient contribution
    - viscous coefficient contribution
    - porous coefficient contribution
 
    Data is written into multiple files in the
    postProcessing/<functionObjectName> directory:
    - coefficient.dat   : integrated coefficients over all geometries
    - CmBin.dat         : moment coefficient bins
    - CdBin.dat         : drag coefficient bins
    - ClBin.dat         : lift coefficient bins
 
    Example of function object specification:
    \verbatim
    forceCoeffs1
    {
        type        forceCoeffs;
        functionObjectLibs ("libforces.so");
        ...
        log         yes;
        writeFields yes;
        patches     (walls);
        liftDir     (0 1 0);
        dragDir     (-1 0 0);
        pitchAxis   (0 0 1);
        magUInf     100;
        lRef        3.5;
        Aref        2.2;
 
        binData
        {
            nBin        20;
            direction   (1 0 0);
            cumulative  yes;
        }
    }
    \endverbatim
 
    \heading Function object usage
    \table
        Property     | Description             | Required    | Default value
        type         | type name: forces       | yes         |
        log          | write force data to standard output | no | no
        writeFields  | write the force and moment coefficient fields | no | no
        patches      | patches included in the forces calculation | yes |
        liftDir      | lift direction          | yes         |
        dragDir      | drag direction          | yes         |
        pitchAxis    | picth axis              | yes         |
        magUInf      | free stream velocity magnitude | yes  |
        lRef         | reference length scale for moment calculations | yes |
        Aref         | reference area          | yes |
        porosity     | flag to include porosity contributions | no | no
    \endtable
 
    Bin data is optional, but if the dictionary is present, the entries must
    be defined according o
    \table
        nBin         | number of data bins     | yes         |
        direction    | direction along which bins are defined | yes |
        cumulative   | bin data accumulated with incresing distance | yes |
    \endtable
 
SeeAlso
    Foam::functionObject
    Foam::OutputFilterFunctionObject
    Foam::forces
 
SourceFiles
    forceCoeffs.C
    IOforceCoeffs.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef forceCoeffs_H
#define forceCoeffs_H
 
#include "forces.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                         Class forceCoeffs Declaration
\*---------------------------------------------------------------------------*/
 
class forceCoeffs
:
    public forces
{
    // Private data
 
        // Force coefficient geometry
 
            //- Lift
            vector liftDir_;
 
            //- Drag
            vector  dragDir_;
 
            //- Pitch
            vector pitchAxis_;
 
 
        // Free-stream conditions
 
            //- Velocity magnitude
            scalar magUInf_;
 
 
        // Reference scales
 
            //- Length
            scalar lRef_;
 
            //- Area
            scalar Aref_;
 
 
        // File streams
 
            //- Integrated coefficients
            autoPtr<OFstream> coeffFilePtr_;
 
            //- Moment coefficient
            autoPtr<OFstream> CmBinFilePtr_;
 
            //- Drag coefficient
            autoPtr<OFstream> CdBinFilePtr_;
 
            //- Lift coefficient
            autoPtr<OFstream> ClBinFilePtr_;
 
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct
        forceCoeffs(const forceCoeffs&);
 
        //- Disallow default bitwise assignment
        void operator=(const forceCoeffs&);
 
 
protected:
 
    // Protected Member Functions
 
        //- Create the output files
        void createFiles();
 
        //- Write header for integrated data
        void writeIntegratedHeader(const word& header, Ostream& os) const;
 
        //- Write header for binned data
        void writeBinHeader(const word& header, Ostream& os) const;
 
        //- Write integrated data
        void writeIntegratedData
        (
            const word& title,
            const List<Field<scalar> >& coeff
        ) const;
 
        //- Write binned data
        void writeBinData(const List<Field<scalar> > coeffs, Ostream& os) const;
 
 
public:
 
    //- Runtime type information
    TypeName("forceCoeffs");
 
 
    // Constructors
 
        //- Construct for given objectRegistry and dictionary.
        //  Allow the possibility to load fields from files
        forceCoeffs
        (
            const word& name,
            const objectRegistry&,
            const dictionary&,
            const bool loadFromFiles = false,
            const bool readFields = true
        );
 
 
    //- Destructor
    virtual ~forceCoeffs();
 
 
    // Member Functions
 
        //- Read the forces data
        virtual void read(const dictionary&);
 
        //- Execute, currently does nothing
        virtual void execute();
 
        //- Execute at the final time-loop, currently does nothing
        virtual void end();
 
        //- Called when time was set at the end of the Time::operator++
        virtual void timeSet();
 
        //- Write the forces
        virtual void write();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //