Test-GAMGAgglomeration.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2015 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
    Test-GAMGAgglomeration
 
Description
    Test application for GAMG agglomeration. Hardcoded to expect GAMG on p.
 
\*---------------------------------------------------------------------------*/
 
#include "fvCFD.H"
#include "GAMGAgglomeration.H"
#include "OFstream.H"
#include "meshTools.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Main program:
 
int main(int argc, char *argv[])
{
    argList::addBoolOption
    (
        "writeObj",
        "write obj files of agglomeration"
    );
    argList::addBoolOption
    (
        "normalise",
        "normalise agglomeration (0..1)"
    );
 
    #include "setRootCase.H"
    #include "createTime.H"
 
    bool writeObj = args.optionFound("writeObj");
    bool normalise = args.optionFound("normalise");
 
    #include "createMesh.H"
 
    const fvSolution& sol = static_cast<const fvSolution&>(mesh);
    const dictionary& pDict = sol.subDict("solvers").subDict("p");
 
    const GAMGAgglomeration& agglom = GAMGAgglomeration::New
    (
        mesh,
        pDict
    );
 
    labelList cellToCoarse(identity(mesh.nCells()));
    labelListList coarseToCell(invertOneToMany(mesh.nCells(), cellToCoarse));
 
    runTime++;
 
    // Write initial agglomeration
    {
        volScalarField scalarAgglomeration
        (
            IOobject
            (
                "agglomeration",
                runTime.timeName(),
                mesh,
                IOobject::NO_READ,
                IOobject::AUTO_WRITE
            ),
            mesh,
            dimensionedScalar("aggomeration", dimless, 0.0)
        );
        scalarField& fld = scalarAgglomeration.internalField();
        forAll(fld, cellI)
        {
            fld[cellI] = cellToCoarse[cellI];
        }
        fld /= max(fld);
        scalarAgglomeration.correctBoundaryConditions();
        scalarAgglomeration.write();
 
        Info<< "Writing initial cell distribution to "
            << runTime.timeName() << endl;
    }
 
 
    for (label level = 0; level < agglom.size(); level++)
    {
        runTime++;
 
        Info<< "Time = " << runTime.timeName() << nl << endl;
 
        const labelList& addr = agglom.restrictAddressing(level);
        label coarseSize = max(addr)+1;
 
        Info<< "Level : " << level << endl
            << returnReduce(addr.size(), sumOp<label>()) << endl
            << "    current size      : "
            << returnReduce(addr.size(), sumOp<label>()) << endl
            << "    agglomerated size : "
            << returnReduce(coarseSize, sumOp<label>()) << endl;
 
        labelList newAddr;
        label newCoarseSize = 0;
        bool ok = GAMGAgglomeration::checkRestriction
        (
            newAddr,
            newCoarseSize,
 
            agglom.meshLevel(level).lduAddr(),
            addr,
            coarseSize
        );
        if (!ok)
        {
            WarningInFunction
                << "At level " << level
                << " there are " << coarseSize
                << " agglomerated cells but " << newCoarseSize
                << " disconnected regions" << endl
                << "    This means that some agglomerations (coarse cells)"
                << "    consist of multiple disconnected regions."
                << endl;
        }
 
 
        forAll(addr, fineI)
        {
            const labelList& cellLabels = coarseToCell[fineI];
            forAll(cellLabels, i)
            {
                cellToCoarse[cellLabels[i]] = addr[fineI];
            }
        }
        coarseToCell = invertOneToMany(coarseSize, cellToCoarse);
 
        // Write agglomeration
        {
            volScalarField scalarAgglomeration
            (
                IOobject
                (
                    "agglomeration",
                    runTime.timeName(),
                    mesh,
                    IOobject::NO_READ,
                    IOobject::AUTO_WRITE
                ),
                mesh,
                dimensionedScalar("aggomeration", dimless, 0.0)
            );
            scalarField& fld = scalarAgglomeration.internalField();
            forAll(fld, cellI)
            {
                fld[cellI] = cellToCoarse[cellI];
            }
            if (normalise)
            {
                fld /= max(fld);
            }
            scalarAgglomeration.correctBoundaryConditions();
            scalarAgglomeration.write();
        }
 
        if (writeObj)
        {
            OFstream str(runTime.path()/runTime.timeName()/"aggomeration.obj");
            label vertI = 0;
 
            // Write all mesh cc
            forAll(mesh.cellCentres(), cellI)
            {
                meshTools::writeOBJ(str, mesh.cellCentres()[cellI]);
                vertI++;
            }
 
            // Determine coarse cc
            forAll(coarseToCell, coarseI)
            {
                const labelList& cellLabels = coarseToCell[coarseI];
 
                point coarseCc = average
                (
                    pointField(mesh.cellCentres(), cellLabels)
                );
                meshTools::writeOBJ(str, coarseCc);
                vertI++;
 
                forAll(cellLabels, i)
                {
                    label cellI = cellLabels[i];
 
                    str << "l " << cellI+1 << ' ' << vertI << nl;
                }
            }
        }
 
        Info<< endl;
    }
 
 
    Info<< "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //