Q.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2013-2016 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.

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Class
    Foam::functionObjects::Q

Group
    grpFieldFunctionObjects

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]

See also
    Foam::functionObjects::fieldExpression
    Foam::functionObjects::fvMeshFunctionObject

SourceFiles
    Q.C

\*---------------------------------------------------------------------------*/

#ifndef functionObjects_Q_H
#define functionObjects_Q_H

#include "fieldExpression.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
namespace functionObjects
{

/*---------------------------------------------------------------------------*\
                          Class Q Declaration
\*---------------------------------------------------------------------------*/

class Q
:
    public fieldExpression
{
    // Private Member Functions

        //- Calculate the Q field and return true if successful
        virtual bool calc();


public:

    //- Runtime type information
    TypeName("Q");


    // Constructors

        //- Construct from Time and dictionary
        Q
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );


    //- Destructor
    virtual ~Q();
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace functionObjects
} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //