refineHexMesh.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2024 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
    refineHexMesh
 
Description
    Refines a hex mesh by 2x2x2 cell splitting.
 
\*---------------------------------------------------------------------------*/
 
#include "fvMesh.H"
#include "pointMesh.H"
#include "argList.H"
#include "Time.H"
#include "hexRef8.H"
#include "cellSet.H"
#include "OFstream.H"
#include "meshTools.H"
#include "IFstream.H"
#include "polyTopoChange.H"
#include "polyTopoChangeMap.H"
#include "volFields.H"
#include "pointFields.H"
#include "ReadFields.H"
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    #include "addOverwriteOption.H"
    #include "addRegionOption.H"
    argList::validArgs.append("cellSet");
    argList::addBoolOption
    (
        "minSet",
        "remove cells from input cellSet to keep to 2:1 ratio"
        " (default is to extend set)"
    );
    argList::addBoolOption
    (
        "noFields",
        "do not update fields"
    );
 
    #include "setRootCase.H"
    #include "createTimeNoFunctionObjects.H"
 
    const bool overwrite = args.optionFound("overwrite");
    const bool minSet = args.optionFound("minSet");
    const bool fields = !args.optionFound("noFields");
 
    #include "createRegionMeshNoChangers.H"
    const word oldInstance = mesh.pointsInstance();
 
    word cellSetName(args.args()[1]);
 
    Info<< "Reading cells to refine from cellSet " << cellSetName
        << nl << endl;
 
    cellSet cellsToRefine(mesh, cellSetName);
 
    Info<< "Read " << returnReduce(cellsToRefine.size(), sumOp<label>())
        << " cells to refine from cellSet " << cellSetName << nl
        << endl;
 
 
    // Read objects in time directory
    IOobjectList objects(mesh, runTime.name());
 
    if (fields) Info<< "Reading geometric fields" << nl << endl;
 
    #include "readVolFields.H"
    // Cannot reliable map surfaceFields to new internal faces
    // #include "readSurfaceFields.H"
    #include "readPointFields.H"
 
    Info<< endl;
 
 
    // Construct refiner without unrefinement. Read existing point/cell level.
    hexRef8 meshCutter(mesh);
 
    // Some stats
    Info<< "Read mesh:" << nl
        << "    cells:" << mesh.globalData().nTotalCells() << nl
        << "    faces:" << mesh.globalData().nTotalFaces() << nl
        << "    points:" << mesh.globalData().nTotalPoints() << nl
        << "    cellLevel :"
        << " min:" << gMin(meshCutter.cellLevel())
        << " max:" << gMax(meshCutter.cellLevel()) << nl
        << "    pointLevel :"
        << " min:" << gMin(meshCutter.pointLevel())
        << " max:" << gMax(meshCutter.pointLevel()) << nl
        << endl;
 
 
    // Maintain 2:1 ratio
    labelList newCellsToRefine
    (
        meshCutter.consistentRefinement
        (
            cellsToRefine.toc(),
            !minSet                 // extend set
        )
    );
 
    // Mesh changing engine.
    polyTopoChange meshMod(mesh);
 
    // Play refinement commands into mesh changer.
    meshCutter.setRefinement(newCellsToRefine, meshMod);
 
    if (!overwrite)
    {
        runTime++;
    }
 
    // Create mesh, return map from old to new mesh.
    autoPtr<polyTopoChangeMap> map = meshMod.changeMesh(mesh);
 
    // Update fields
    mesh.topoChange(map);
 
    // Update numbering of cells/vertices.
    meshCutter.topoChange(map);
 
    Info<< "Refined from " << returnReduce(map().nOldCells(), sumOp<label>())
        << " to " << mesh.globalData().nTotalCells() << " cells." << nl << endl;
 
    if (overwrite)
    {
        mesh.setInstance(oldInstance);
        meshCutter.setInstance(oldInstance);
    }
    Info<< "Writing mesh to " << runTime.name() << endl;
 
    mesh.write();
    meshCutter.write();
 
    Info<< "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //