directions.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/>.
 
\*---------------------------------------------------------------------------*/
 
#include "directions.H"
#include "polyMesh.H"
#include "twoDPointCorrector.H"
#include "directionInfo.H"
#include "MeshWave.H"
#include "OFstream.H"
#include "meshTools.H"
#include "hexMatcher.H"
#include "Switch.H"
#include "globalMeshData.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    template<>
    const char* Foam::NamedEnum
    <
        Foam::directions::directionType,
        3
    >::names[] =
    {
        "tan1",
        "tan2",
        "normal"
    };
}
 
const Foam::NamedEnum<Foam::directions::directionType, 3>
    Foam::directions::directionTypeNames_;
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
// For debugging
void Foam::directions::writeOBJ(Ostream& os, const point& pt)
{
    os << "v " << pt.x() << ' ' << pt.y() << ' ' << pt.z() << endl;
}
 
// For debugging
void Foam::directions::writeOBJ
(
    Ostream& os,
    const point& pt0,
    const point& pt1,
    label& vertI
)
{
    writeOBJ(os, pt0);
    writeOBJ(os, pt1);
 
    os << "l " << vertI + 1 << ' ' << vertI + 2 << endl;
 
    vertI += 2;
}
 
 
// Dump to file.
void Foam::directions::writeOBJ
(
    const fileName& fName,
    const primitiveMesh& mesh,
    const vectorField& dirs
)
{
    Pout<< "Writing cell info to " << fName << " as vectors at the cellCentres"
        << endl << endl;
 
    OFstream xDirStream(fName);
 
    label vertI = 0;
 
    forAll(dirs, cellI)
    {
        const point& ctr = mesh.cellCentres()[cellI];
 
        // Calculate local length scale
        scalar minDist = GREAT;
 
        const labelList& nbrs = mesh.cellCells()[cellI];
 
        forAll(nbrs, nbrI)
        {
            minDist = min(minDist, mag(mesh.cellCentres()[nbrs[nbrI]] - ctr));
        }
 
        scalar scale = 0.5*minDist;
 
        writeOBJ(xDirStream, ctr, ctr + scale*dirs[cellI], vertI);
    }
}
 
 
void Foam::directions::check2D
(
    const twoDPointCorrector* correct2DPtr,
    const vector& vec
)
{
    if (correct2DPtr)
    {
        if (mag(correct2DPtr->planeNormal() & vec) > 1e-6)
        {
            FatalErrorInFunction
                << "is not normal to plane defined in dynamicMeshDict."
                << endl
                << "Either make case 3D or adjust vector."
                << exit(FatalError);
        }
    }
}
 
 
// Get direction on all cells
Foam::vectorField Foam::directions::propagateDirection
(
    const polyMesh& mesh,
    const bool useTopo,
    const polyPatch& pp,
    const vectorField& ppField,
    const vector& defaultDir
)
{
    // Seed all faces on patch
    labelList changedFaces(pp.size());
    List<directionInfo> changedFacesInfo(pp.size());
 
    if (useTopo)
    {
        forAll(pp, patchFaceI)
        {
            label meshFaceI = pp.start() + patchFaceI;
 
            label cellI = mesh.faceOwner()[meshFaceI];
 
            if (!hexMatcher().isA(mesh, cellI))
            {
                FatalErrorInFunction
                    << "useHexTopology specified but cell " << cellI
                    << " on face " << patchFaceI << " of patch " << pp.name()
                    << " is not a hex" << exit(FatalError);
            }
 
            const vector& cutDir = ppField[patchFaceI];
 
            // Get edge(bundle) on cell most in direction of cutdir
            label edgeI = meshTools::cutDirToEdge(mesh, cellI, cutDir);
 
            // Convert edge into index on face
            label faceIndex =
                directionInfo::edgeToFaceIndex
                (
                    mesh,
                    cellI,
                    meshFaceI,
                    edgeI
                );
 
            // Set initial face and direction
            changedFaces[patchFaceI] = meshFaceI;
            changedFacesInfo[patchFaceI] =
                directionInfo
                (
                    faceIndex,
                    cutDir
                );
        }
    }
    else
    {
        forAll(pp, patchFaceI)
        {
            changedFaces[patchFaceI] = pp.start() + patchFaceI;
            changedFacesInfo[patchFaceI] =
                directionInfo
                (
                    -2,         // Geometric information only
                    ppField[patchFaceI]
                );
        }
    }
 
    MeshWave<directionInfo> directionCalc
    (
        mesh,
        changedFaces,
        changedFacesInfo,
        mesh.globalData().nTotalCells()+1
    );
 
    const List<directionInfo>& cellInfo = directionCalc.allCellInfo();
 
    vectorField dirField(cellInfo.size());
 
    label nUnset = 0;
    label nGeom = 0;
    label nTopo = 0;
 
    forAll(cellInfo, cellI)
    {
        label index = cellInfo[cellI].index();
 
        if (index == -3)
        {
            // Never visited
            WarningInFunction
                << "Cell " << cellI << " never visited to determine "
                << "local coordinate system" << endl
                << "Using direction " << defaultDir << " instead" << endl;
 
            dirField[cellI] = defaultDir;
 
            nUnset++;
        }
        else if (index == -2)
        {
            // Geometric direction
            dirField[cellI] = cellInfo[cellI].n();
 
            nGeom++;
        }
        else if (index == -1)
        {
            FatalErrorInFunction
                << "Illegal index " << index << endl
                << "Value is only allowed on faces" << abort(FatalError);
        }
        else
        {
            // Topological edge cut. Convert into average cut direction.
            dirField[cellI] = meshTools::edgeToCutDir(mesh, cellI, index);
 
            nTopo++;
        }
    }
 
    Pout<< "Calculated local coords for " << defaultDir
        << endl
        << "    Geometric cut cells   : " << nGeom << endl
        << "    Topological cut cells : " << nTopo << endl
        << "    Unset cells           : " << nUnset << endl
        << endl;
 
    return dirField;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::directions::directions
(
    const polyMesh& mesh,
    const dictionary& dict,
    const twoDPointCorrector* correct2DPtr
)
:
    List<vectorField>(wordList(dict.lookup("directions")).size())
{
    const wordList wantedDirs(dict.lookup("directions"));
 
    bool wantNormal = false;
    bool wantTan1 = false;
    bool wantTan2 = false;
 
    forAll(wantedDirs, i)
    {
        directionType wantedDir = directionTypeNames_[wantedDirs[i]];
 
        if (wantedDir == NORMAL)
        {
            wantNormal = true;
        }
        else if (wantedDir == TAN1)
        {
            wantTan1 = true;
        }
        else if (wantedDir == TAN2)
        {
            wantTan2 = true;
        }
    }
 
 
    label nDirs = 0;
 
    const word coordSystem(dict.lookup("coordinateSystem"));
 
    if (coordSystem == "global")
    {
        const dictionary& globalDict = dict.subDict("globalCoeffs");
 
        vector tan1(globalDict.lookup("tan1"));
        check2D(correct2DPtr, tan1);
 
        vector tan2(globalDict.lookup("tan2"));
        check2D(correct2DPtr, tan2);
 
        vector normal = tan1 ^ tan2;
        normal /= mag(normal);
 
        Pout<< "Global Coordinate system:" << endl
            << "     normal : " << normal << endl
            << "     tan1   : " << tan1 << endl
            << "     tan2   : " << tan2
            << endl << endl;
 
        if (wantNormal)
        {
            operator[](nDirs++) = vectorField(1, normal);
        }
        if (wantTan1)
        {
            operator[](nDirs++) = vectorField(1, tan1);
        }
        if (wantTan2)
        {
            operator[](nDirs++) = vectorField(1, tan2);
        }
    }
    else if (coordSystem == "patchLocal")
    {
        const dictionary& patchDict = dict.subDict("patchLocalCoeffs");
 
        const word patchName(patchDict.lookup("patch"));
 
        const label patchI = mesh.boundaryMesh().findPatchID(patchName);
 
        if (patchI == -1)
        {
            FatalErrorInFunction
                << "Cannot find patch "
                << patchName
                << exit(FatalError);
        }
 
        // Take zeroth face on patch
        const polyPatch& pp = mesh.boundaryMesh()[patchI];
 
        vector tan1(patchDict.lookup("tan1"));
 
        const vector& n0 = pp.faceNormals()[0];
 
        if (correct2DPtr)
        {
            tan1 = correct2DPtr->planeNormal() ^ n0;
 
            WarningInFunction
                << "Discarding user specified tan1 since 2D case." << endl
                << "Recalculated tan1 from face normal and planeNormal as "
                << tan1 << endl << endl;
        }
 
        Switch useTopo(dict.lookup("useHexTopology"));
 
        vectorField normalDirs;
        vectorField tan1Dirs;
 
        if (wantNormal || wantTan2)
        {
            normalDirs =
                propagateDirection
                (
                    mesh,
                    useTopo,
                    pp,
                    pp.faceNormals(),
                    n0
                );
 
            if (wantNormal)
            {
                this->operator[](nDirs++) = normalDirs;
            }
        }
 
        if (wantTan1 || wantTan2)
        {
            tan1Dirs =
                propagateDirection
                (
                    mesh,
                    useTopo,
                    pp,
                    vectorField(pp.size(), tan1),
                    tan1
                );
 
 
            if (wantTan1)
            {
                this->operator[](nDirs++) = tan1Dirs;
            }
        }
        if (wantTan2)
        {
            tmp<vectorField> tan2Dirs = normalDirs ^ tan1Dirs;
 
            this->operator[](nDirs++) = tan2Dirs;
        }
    }
    else
    {
        FatalErrorInFunction
            << "Unknown coordinate system "
            << coordSystem << endl
            << "Known types are global and patchLocal"
            << exit(FatalError);
    }
}
 
 
// ************************************************************************* //