mshToFoam.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
    mshToFoam
 
Group
    grpMeshConversionUtilities
 
Description
    Convert .msh file generated by the Adventure system.
 
    Note: the .msh format does not contain any boundary information. It is
    purely a description of the internal mesh.
 
    Can read both linear-tet format (i.e. 4 verts per tet) and linear-hex
    format (8 verts per hex) (if provided with the -hex (at your option)
    (Note: will bomb out if not supplied with the correct option for the
     file format)
 
    Not extensively tested.
 
\*---------------------------------------------------------------------------*/
 
#include "argList.H"
#include "Time.H"
#include "polyMesh.H"
#include "IFstream.H"
#include "polyPatch.H"
#include "ListOps.H"
#include "cellModel.H"
 
#include <fstream>
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 
int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Convert an Adventure .msh file to OpenFOAM"
    );
    argList::noParallel();
    argList::addArgument(".msh file");
    argList::addBoolOption
    (
        "hex",
        "Treat input as containing hex instead of tet cells"
    );
 
    #include "setRootCase.H"
    #include "createTime.H"
 
    const bool readHex = args.found("hex");
    IFstream mshStream(args.get<fileName>(1));
 
    label nCells;
    mshStream >> nCells;
 
    if (readHex)
    {
        Info<< "Trying to read " << nCells << " hexes." << nl << endl;
    }
    else
    {
        Info<< "Trying to read " << nCells << " tets." << nl << endl;
    }
 
    cellShapeList cells(nCells);
 
    const cellModel& tet = cellModel::ref(cellModel::TET);
    const cellModel& hex = cellModel::ref(cellModel::HEX);
 
    labelList tetPoints(4);
    labelList hexPoints(8);
 
    if (readHex)
    {
        for (label celli = 0; celli < nCells; celli++)
        {
            for (label cp = 0; cp < 8; cp++)
            {
                mshStream >> hexPoints[cp];
            }
            cells[celli].reset(hex, hexPoints);
        }
    }
    else
    {
        for (label celli = 0; celli < nCells; celli++)
        {
            for (label cp = 0; cp < 4; cp++)
            {
                mshStream >> tetPoints[cp];
            }
            cells[celli].reset(tet, tetPoints);
        }
    }
 
 
    label nPoints;
 
    mshStream >> nPoints;
 
    Info<< "Trying to read " << nPoints << " points." << endl << endl;
 
    pointField points(nPoints);
 
 
    for (label pointi = 0; pointi < nPoints; pointi++)
    {
        scalar x, y, z;
 
        mshStream >> x >> y >> z;
 
        points[pointi] = point(x, y, z);
    }
 
 
    polyMesh mesh
    (
        IOobject
        (
            polyMesh::defaultRegion,
            runTime.constant(),
            runTime
        ),
        std::move(points),
        cells,
        faceListList(),
        wordList(),
        wordList(),
        "defaultFaces",
        polyPatch::typeName,
        wordList()
    );
 
    // Set the precision of the points data to 10
    IOstream::defaultPrecision(max(10u, IOstream::defaultPrecision()));
 
    Info<< "Writing mesh ..." << endl;
 
    mesh.removeFiles();
    mesh.write();
 
    Info<< "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //