Q.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2013-2014 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::Q
 
Group
    grpUtilitiesFunctionObjects
 
Description
    This function object calculates and outputs the second invariant of the
    velocity gradient tensor [1/s^2].
 
    \f[
        Q = 0.5(sqr(tr(\nabla U)) - tr(((\nabla U) \cdot (\nabla U))))
    \f]
 
    where
    \vartable
        U           | velocity [m/s]
    \endvartable
 
    Example of function object specification to calculate Q:
    \verbatim
    Q1
    {
        type        Q;
        functionObjectLibs ("libutilityFunctionObjects.so");
        ...
    }
    \endverbatim
 
    \heading Function object usage
    \table
        Property     | Description             | Required    | Default value
        type         | type name: Q            | yes         |
        UName        | Name of velocity field  | no          | U
        resultName   | Name of Q field         | no          | <function name>
        log          | Log to standard output  | no          | yes
    \endtable
 
SourceFiles
    Q.C
    IOQ.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef Q_H
#define Q_H
 
#include "volFieldsFwd.H"
#include "surfaceFieldsFwd.H"
#include "OFstream.H"
#include "Switch.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of classes
class objectRegistry;
class dictionary;
class polyMesh;
class mapPolyMesh;
 
/*---------------------------------------------------------------------------*\
                          Class Q Declaration
\*---------------------------------------------------------------------------*/
 
class Q
{
    // Private data
 
        //- Name of this set of Q objects
        word name_;
 
        //- Reference to the database
        const objectRegistry& obr_;
 
        //- On/off switch
        bool active_;
 
        //- Name of velocity field, default is "U"
        word UName_;
 
        //- Result name
        word resultName_;
 
        //- Switch to send output to Info as well as to file
        Switch log_;
 
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct
        Q(const Q&);
 
        //- Disallow default bitwise assignment
        void operator=(const Q&);
 
 
public:
 
    //- Runtime type information
    TypeName("Q");
 
 
    // Constructors
 
        //- Construct for given objectRegistry and dictionary.
        //  Allow the possibility to load fields from files
        Q
        (
            const word& name,
            const objectRegistry&,
            const dictionary&,
            const bool loadFromFiles = false
        );
 
 
    //- Destructor
    virtual ~Q();
 
 
    // Member Functions
 
        //- Return name of the set of Q
        virtual const word& name() const
        {
            return name_;
        }
 
        //- Read the Q 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();
 
        //- Calculate the Q and write
        virtual void write();
 
        //- Update for changes of mesh
        virtual void updateMesh(const mapPolyMesh&)
        {}
 
        //- Update for changes of mesh
        virtual void movePoints(const polyMesh&)
        {}
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //