flowType.C

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-------------------------------------------------------------------------------
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.

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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    You should have received a copy of the GNU General Public License
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Application
    flowType

Description
    Calculates and writes the flowType of velocity field U.

    The -noWrite option has no meaning.

    The flow type parameter is obtained according to the following equation:
    @verbatim
                 |D| - |Omega|
        lambda = -------------
                 |D| + |Omega|

        -1 = rotational flow
         0 = simple shear flow
         1 = planar extensional flow
    @endverbatim

Usage

    - flowType [OPTIONS]

    @param -dict <dictionary name>\n
    Use named dictionary instead of system/controlDict.

    @param -noZero \n
    Ignore timestep 0.

    @param -constant \n
    Include the constant directory.

    @param -time <time>\n
    Apply only to specific time.

    @param -latestTime \n
    Only apply to latest time step.

    @param -case <dir>\n
    Case directory.

    @param -parallel \n
    Run in parallel.

    @param -help \n
    Display help message.

    @param -doc \n
    Display Doxygen API documentation page for this application.

    @param -srcDoc \n
    Display Doxygen source documentation page for this application.

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

#include <postCalc/calc.H>
#include <finiteVolume/fvc.H>

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

void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
{
    IOobject Uheader
    (
        "U",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ
    );

    if (Uheader.headerOk())
    {
        Info<< "    Reading U" << endl;
        volVectorField U(Uheader, mesh);

        volTensorField gradU = fvc::grad(U);
        volScalarField magD = mag(symm(gradU));
        volScalarField magOmega = mag(skew(gradU));
        dimensionedScalar smallMagD("smallMagD", magD.dimensions(), SMALL);

        Info<< "    Calculating flowType" << endl;

        volScalarField flowType
        (
            IOobject
            (
                "flowType",
                runTime.timeName(),
                mesh,
                IOobject::NO_READ
            ),
            (magD - magOmega)/(magD + magOmega + smallMagD)
        );

        flowType.write();
    }
    else
    {
        Info<< "    No U" << endl;
    }

    Info<< "\nEnd\n" << endl;
}


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