postProcessBSD.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2016 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
    postProcessBSD

Description
    This is a post-processing application to analyze the results of population balance equation. It calcualtes the mean and variance of bubble size distribution at each time step and write the results as field variables in each time directory. They can be further processed using "postProcess -func probe" to probe the values on the required points.

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


#include "twoPhaseMixtureThermo.H"
#include "fvCFD.H"

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

class BSDProperties
{

private:
    volScalarField& M0;
    volScalarField& M1;
    volScalarField& M2;
    const volScalarField& alpha1;
    const fvMesh& mesh;

public:
    BSDProperties
    (
        volScalarField &M0_, volScalarField &M1_,
        volScalarField &M2_, volScalarField &alpha1_,
        const fvMesh &mesh_
    )
    :
    M0(M0_),
    M1(M1_),
    M2(M2_),
    alpha1(alpha1_),
    mesh(mesh_)
    {}

    volScalarField meanBSD()
    {
        volScalarField alphaCutOff
        (
            IOobject
            (
                "alphaCutOff",
                mesh,
                IOobject::READ_IF_PRESENT,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensionedScalar("alphaCutOff", dimless, 0.5)
        );
        volScalarField insideFoam(pos(alphaCutOff - alpha1));
        volScalarField mean_
        (
            IOobject
            (
                "mean_",
                mesh,
                IOobject::READ_IF_PRESENT,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensionedScalar("mean_", dimless, 0.0)
        );
        forAll(mesh.C(), celli)
        {
            M0 = Foam::max(M0, dimensionedScalar("M0min", M0.dimensions(), SMALL));
            M1 = Foam::max(M1, dimensionedScalar("M1min", M1.dimensions(), SMALL));
            M2 = Foam::max(M2, dimensionedScalar("M2min", M2.dimensions(), SMALL));
            mean_[celli] = scalar(2.0)*Foam::log(M1[celli]/M0[celli]) -
                           scalar(0.5)*Foam::log(M2[celli]/M0[celli]);
        }
        return (insideFoam*mean_);
    }
    volScalarField varianceBSD()
    {
        volScalarField alphaCutOff
        (
            IOobject
            (
                "alphaCutOff",
                mesh,
                IOobject::READ_IF_PRESENT,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensionedScalar("alphaCutOff", dimless, 0.5)
        );
        volScalarField insideFoam(pos(alphaCutOff - alpha1));
        volScalarField variance_
        (
            IOobject
            (
                "variance_",
                mesh,
                IOobject::READ_IF_PRESENT,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensionedScalar("variance_", dimless, 0.0)
        );
        forAll(mesh.C(), celli)
        {
            M0 = Foam::max(M0, dimensionedScalar("M0min", M0.dimensions(), SMALL));
            M1 = Foam::max(M1, dimensionedScalar("M1min", M1.dimensions(), SMALL));
            M2 = Foam::max(M2, dimensionedScalar("M2min", M2.dimensions(), SMALL));
            variance_[celli] =
                (
                    scalar(2.0)*(
                    scalar(0.5)*Foam::log(M2[celli]/M0[celli])
                  - Foam::log(M1[celli]/M0[celli])
                    )
                );
            if (variance_[celli] < 0.0)
            {
                variance_[celli] = 0.0;
            }
        }
        return (insideFoam*variance_);
    }
};

int main(int argc, char *argv[])
{
        timeSelector::addOptions();

#   include "setRootCase.H"
#   include "createTime.H"

    instantList timeDirs = timeSelector::select0(runTime, args);

#   include "createMesh.H"

    forAll(timeDirs, timeI)
    {
        runTime.setTime(timeDirs[timeI], timeI);

        Info<< "Time = " << runTime.timeName() << endl;

        IOobject M0header
        (
            "M0",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ
        );

        IOobject M1header
        (
            "M1",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ
        );

        IOobject M2header
        (
            "M2",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ
        );

        // Check M0, M1 and M2 exist
        if
        (
            M0header.headerOk()
         && M1header.headerOk()
         && M2header.headerOk()
        )
        {
            mesh.readUpdate();

            Info<< "    Reading M0" << endl;
            volScalarField M0(M0header, mesh);

            Info<< "    Reading M1" << endl;
            volScalarField M1(M1header, mesh);

            Info<< "    Reading M2" << endl;
            volScalarField M2(M2header, mesh);

            Info<< "    Calculating BSD properties ... " << endl;

            twoPhaseMixtureThermo mixture(mesh);
            volScalarField& alpha1(mixture.alpha1());

            BSDProperties mu(M0, M1, M2, alpha1, mesh);
            volScalarField BSDMean
            (
                IOobject
                    (
                        "BSDMean",
                        runTime.timeName(),
                        mesh,
                        IOobject::NO_READ,
                        IOobject::AUTO_WRITE
                    ),
                    mu.meanBSD()
            );
            // Info<< "BSDMean = " << BSDMean.internalField() << endl;
            BSDMean.write();

            BSDProperties sigmaTwo(M0, M1, M2, alpha1, mesh);
            volScalarField BSDVariance
            (
                IOobject
                    (
                        "BSDVariance",
                        runTime.timeName(),
                        mesh,
                        IOobject::NO_READ,
                        IOobject::AUTO_WRITE
                    ),
                    sigmaTwo.varianceBSD()
            );
            // Info<< "BSDVariance = " << BSDVariance.internalField() << endl;
            BSDVariance.write();
        }
        else
        {
            Info<< "    Moments are not available." << endl;
        }

        Info<< endl;
    }
    Info<< nl << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
        << "  ClockTime = " << runTime.elapsedClockTime() << " s"
        << nl << endl;

    Info<< "End\n" << endl;

    return 0;
}


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