Lambda2.C

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/*---------------------------------------------------------------------------* \
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 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/>.
 
Application
    Lambda2
 
Description
    Calculates and writes the second largest eigenvalue of the sum of the
    square of the symmetrical and anti-symmetrical parts of the velocity
    gradient tensor.
 
    The -noWrite option has no meaning.
 
\*---------------------------------------------------------------------------*/
 
#include "calc.H"
#include "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);
 
        const volTensorField gradU(fvc::grad(U));
 
        volTensorField SSplusWW
        (
            (symm(gradU) & symm(gradU)) + (skew(gradU) & skew(gradU))
        );
 
        volScalarField Lambda2
        (
            IOobject
            (
                "Lambda2",
                runTime.timeName(),
                mesh,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            -eigenValues(SSplusWW)().component(vector::Y)
        );
 
        Info<< "    Writing -Lambda2" << endl;
        Lambda2.write();
    }
    else
    {
        Info<< "    No U" << endl;
    }
 
    Info<< "\nEnd\n" << endl;
}
 
 
// ************************************************************************* //