526 lines
16 KiB
C
526 lines
16 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright held by original author
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Description
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Checks for multiple patch faces on same cell and combines them. These
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result from e.g. refined neighbouring cells getting removed, leaving 4
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exposed faces with same owner.
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Rules for merging:
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- only boundary faces (since multiple internal faces between two cells
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not allowed anyway)
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- faces have to have same owner
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- faces have to be connected via edge which are not features (so angle
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between them < feature angle)
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- outside of faces has to be single loop
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- outside of face should not be (or just slightly) concave (so angle
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between consecutive edges < concaveangle
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E.g. to allow all faces on same patch to be merged:
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combinePatchFaces .. cavity 180 -concaveAngle 90
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\*---------------------------------------------------------------------------*/
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#include "PstreamReduceOps.H"
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#include "argList.H"
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#include "objectRegistry.H"
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#include "Time.H"
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#include "directTopoChange.H"
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#include "polyModifyFace.H"
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#include "polyAddFace.H"
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#include "combineFaces.H"
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#include "removePoints.H"
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#include "polyMesh.H"
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#include "mapPolyMesh.H"
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#include "mathematicalConstants.H"
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using namespace Foam;
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// Sin of angle between two consecutive edges on a face. If sin(angle) larger
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// than this the face will be considered concave.
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const scalar defaultConcaveAngle = 30;
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// Same check as snapMesh
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void checkSnapMesh
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(
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const Time& runTime,
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const polyMesh& mesh,
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labelHashSet& wrongFaces
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)
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{
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IOdictionary snapDict
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(
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IOobject
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(
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"snapMeshDict",
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runTime.system(),
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mesh,
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IOobject::MUST_READ,
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IOobject::NO_WRITE
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)
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);
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// Max nonorthogonality allowed
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scalar maxNonOrtho(readScalar(snapDict.lookup("maxNonOrtho")));
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primitiveMesh::nonOrthThreshold_ = maxNonOrtho;
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// Max concaveness allowed.
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scalar maxConcave(readScalar(snapDict.lookup("maxConcave")));
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primitiveMesh::faceAngleThreshold_ = maxConcave;
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// Min volume allowed (factor of minimum cellVolume)
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scalar relMinVol(readScalar(snapDict.lookup("minVol")));
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const scalar minCellVol = min(mesh.cellVolumes());
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const scalar minPyrVol = relMinVol*minCellVol;
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// Min area
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scalar minArea(readScalar(snapDict.lookup("minArea")));
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if (maxNonOrtho < 180.0 - SMALL)
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{
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Pout<< "Checking non orthogonality" << endl;
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label nOldSize = wrongFaces.size();
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mesh.checkFaceOrthogonality(false, &wrongFaces);
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Pout<< "Detected " << wrongFaces.size() - nOldSize
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<< " faces with non-orthogonality > " << maxNonOrtho << " degrees"
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<< endl;
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}
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if (minPyrVol > -GREAT)
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{
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Pout<< "Checking face pyramids" << endl;
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label nOldSize = wrongFaces.size();
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mesh.checkFacePyramids(false, minPyrVol, &wrongFaces);
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Pout<< "Detected additional " << wrongFaces.size() - nOldSize
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<< " faces with illegal face pyramids" << endl;
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}
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if (maxConcave < 180.0 - SMALL)
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{
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Pout<< "Checking face angles" << endl;
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label nOldSize = wrongFaces.size();
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mesh.checkFaceAngles(false, &wrongFaces);
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Pout<< "Detected additional " << wrongFaces.size() - nOldSize
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<< " faces with concavity > " << maxConcave << " degrees"
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<< endl;
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}
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if (minArea > -SMALL)
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{
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Pout<< "Checking face areas" << endl;
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label nOldSize = wrongFaces.size();
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const scalarField magFaceAreas = mag(mesh.faceAreas());
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forAll(magFaceAreas, faceI)
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{
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if (magFaceAreas[faceI] < minArea)
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{
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wrongFaces.insert(faceI);
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}
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}
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Pout<< "Detected additional " << wrongFaces.size() - nOldSize
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<< " faces with area < " << minArea << " m^2" << endl;
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}
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}
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// Merge faces on the same patch (usually from exposing refinement)
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// Can undo merges if these cause problems.
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label mergePatchFaces
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(
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const scalar minCos,
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const scalar concaveSin,
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const bool snapMeshDict,
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const Time& runTime,
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polyMesh& mesh
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)
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{
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// Patch face merging engine
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combineFaces faceCombiner(mesh);
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// Get all sets of faces that can be merged
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labelListList allFaceSets(faceCombiner.getMergeSets(minCos, concaveSin));
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label nFaceSets = returnReduce(allFaceSets.size(), sumOp<label>());
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Info<< "Merging " << nFaceSets << " sets of faces." << endl;
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if (nFaceSets > 0)
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{
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// Store the faces of the face sets
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List<faceList> allFaceSetsFaces(allFaceSets.size());
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forAll(allFaceSets, setI)
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{
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allFaceSetsFaces[setI] = UIndirectList<face>
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(
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mesh.faces(),
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allFaceSets[setI]
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);
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}
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autoPtr<mapPolyMesh> map;
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{
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// Topology changes container
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directTopoChange meshMod(mesh);
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// Merge all faces of a set into the first face of the set.
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faceCombiner.setRefinement(allFaceSets, meshMod);
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// Change the mesh (no inflation)
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map = meshMod.changeMesh(mesh, false, true);
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// Update fields
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mesh.updateMesh(map);
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// Move mesh (since morphing does not do this)
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if (map().hasMotionPoints())
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{
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mesh.movePoints(map().preMotionPoints());
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}
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else
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{
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// Delete mesh volumes. No other way to do this?
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mesh.clearOut();
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}
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}
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// Check for errors and undo
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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// Faces in error.
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labelHashSet errorFaces;
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if (snapMeshDict)
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{
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checkSnapMesh(runTime, mesh, errorFaces);
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}
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else
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{
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mesh.checkFacePyramids(false, -SMALL, &errorFaces);
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}
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// Sets where the master is in error
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labelHashSet errorSets;
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forAll(allFaceSets, setI)
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{
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label newMasterI = map().reverseFaceMap()[allFaceSets[setI][0]];
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if (errorFaces.found(newMasterI))
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{
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errorSets.insert(setI);
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}
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}
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label nErrorSets = returnReduce(errorSets.size(), sumOp<label>());
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Info<< "Detected " << nErrorSets
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<< " error faces on boundaries that have been merged."
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<< " These will be restored to their original faces."
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<< endl;
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if (nErrorSets > 0)
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{
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// Renumber stored faces to new vertex numbering.
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forAllConstIter(labelHashSet, errorSets, iter)
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{
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label setI = iter.key();
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faceList& setFaceVerts = allFaceSetsFaces[setI];
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forAll(setFaceVerts, i)
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{
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inplaceRenumber(map().reversePointMap(), setFaceVerts[i]);
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// Debug: check that all points are still there.
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forAll(setFaceVerts[i], j)
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{
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label newVertI = setFaceVerts[i][j];
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if (newVertI < 0)
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{
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FatalErrorIn("mergePatchFaces")
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<< "In set:" << setI << " old face labels:"
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<< allFaceSets[setI] << " new face vertices:"
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<< setFaceVerts[i] << " are unmapped vertices!"
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<< abort(FatalError);
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}
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}
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}
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}
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// Topology changes container
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directTopoChange meshMod(mesh);
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// Restore faces
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forAllConstIter(labelHashSet, errorSets, iter)
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{
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label setI = iter.key();
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const labelList& setFaces = allFaceSets[setI];
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const faceList& setFaceVerts = allFaceSetsFaces[setI];
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label newMasterI = map().reverseFaceMap()[setFaces[0]];
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// Restore. Get face properties.
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label own = mesh.faceOwner()[newMasterI];
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label zoneID = mesh.faceZones().whichZone(newMasterI);
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bool zoneFlip = false;
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if (zoneID >= 0)
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{
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const faceZone& fZone = mesh.faceZones()[zoneID];
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zoneFlip = fZone.flipMap()[fZone.whichFace(newMasterI)];
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}
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label patchI = mesh.boundaryMesh().whichPatch(newMasterI);
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Pout<< "Restoring new master face " << newMasterI
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<< " to vertices " << setFaceVerts[0] << endl;
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// Modify the master face.
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meshMod.setAction
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(
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polyModifyFace
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(
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setFaceVerts[0], // original face
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newMasterI, // label of face
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own, // owner
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-1, // neighbour
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false, // face flip
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patchI, // patch for face
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false, // remove from zone
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zoneID, // zone for face
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zoneFlip // face flip in zone
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)
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);
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// Add the previously removed faces
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for (label i = 1; i < setFaces.size(); i++)
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{
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Pout<< "Restoring removed face " << setFaces[i]
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<< " with vertices " << setFaceVerts[i] << endl;
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meshMod.setAction
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(
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polyAddFace
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(
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setFaceVerts[i], // vertices
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own, // owner,
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-1, // neighbour,
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-1, // masterPointID,
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-1, // masterEdgeID,
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newMasterI, // masterFaceID,
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false, // flipFaceFlux,
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patchI, // patchID,
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zoneID, // zoneID,
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zoneFlip // zoneFlip
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)
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);
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}
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}
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// Change the mesh (no inflation)
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map = meshMod.changeMesh(mesh, false, true);
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// Update fields
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mesh.updateMesh(map);
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// Move mesh (since morphing does not do this)
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if (map().hasMotionPoints())
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{
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mesh.movePoints(map().preMotionPoints());
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}
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else
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{
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// Delete mesh volumes. No other way to do this?
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mesh.clearOut();
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}
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}
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}
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else
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{
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Info<< "No faces merged ..." << endl;
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}
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return nFaceSets;
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}
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// Remove points not used by any face or points used by only two faces where
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// the edges are in line
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label mergeEdges(const scalar minCos, polyMesh& mesh)
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{
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Info<< "Merging all points on surface that" << nl
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<< "- are used by only two boundary faces and" << nl
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<< "- make an angle with a cosine of more than " << minCos
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<< "." << nl << endl;
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// Point removal analysis engine
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removePoints pointRemover(mesh);
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// Count usage of points
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boolList pointCanBeDeleted;
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label nRemove = pointRemover.countPointUsage(minCos, pointCanBeDeleted);
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if (nRemove > 0)
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{
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Info<< "Removing " << nRemove
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<< " straight edge points ..." << endl;
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// Topology changes container
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directTopoChange meshMod(mesh);
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pointRemover.setRefinement(pointCanBeDeleted, meshMod);
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// Change the mesh (no inflation)
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autoPtr<mapPolyMesh> map = meshMod.changeMesh(mesh, false, true);
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// Update fields
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mesh.updateMesh(map);
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// Move mesh (since morphing does not do this)
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if (map().hasMotionPoints())
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{
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mesh.movePoints(map().preMotionPoints());
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}
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else
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{
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// Delete mesh volumes. No other way to do this?
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mesh.clearOut();
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}
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}
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else
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{
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Info<< "No straight edges simplified and no points removed ..." << endl;
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}
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return nRemove;
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}
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// Main program:
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int main(int argc, char *argv[])
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{
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argList::validArgs.append("feature angle [0..180]");
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argList::validOptions.insert("concaveAngle", "[0..180]");
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argList::validOptions.insert("snapMesh", "");
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argList::validOptions.insert("overwrite", "");
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# include "setRootCase.H"
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# include "createTime.H"
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runTime.functionObjects().off();
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# include "createPolyMesh.H"
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const word oldInstance = mesh.pointsInstance();
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scalar featureAngle(readScalar(IStringStream(args.additionalArgs()[0])()));
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scalar minCos = Foam::cos(featureAngle*mathematicalConstant::pi/180.0);
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scalar concaveAngle = defaultConcaveAngle;
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args.optionReadIfPresent("concaveAngle", concaveAngle);
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scalar concaveSin = Foam::sin(concaveAngle*mathematicalConstant::pi/180.0);
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bool snapMeshDict = args.optionFound("snapMesh");
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bool overwrite = args.optionFound("overwrite");
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Info<< "Merging all faces of a cell" << nl
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<< " - which are on the same patch" << nl
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<< " - which make an angle < " << featureAngle << " degrees"
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<< nl
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<< " (cos:" << minCos << ')' << nl
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<< " - even when resulting face becomes concave by more than "
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<< concaveAngle << " degrees" << nl
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<< " (sin:" << concaveSin << ')' << nl
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<< endl;
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if (!overwrite)
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{
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runTime++;
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}
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// Merge faces on same patch
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label nChanged = mergePatchFaces
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(
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minCos,
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concaveSin,
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snapMeshDict,
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runTime,
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mesh
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);
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// Merge points on straight edges and remove unused points
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if (snapMeshDict)
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{
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Info<< "Merging all 'loose' points on surface edges"
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<< ", regardless of the angle they make." << endl;
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// Surface bnound to be used to extrude. Merge all loose points.
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nChanged += mergeEdges(-1, mesh);
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}
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else
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{
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nChanged += mergeEdges(minCos, mesh);
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}
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if (nChanged > 0)
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{
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if (overwrite)
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{
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mesh.setInstance(oldInstance);
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}
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Info<< "Writing morphed mesh to time " << runTime.timeName() << endl;
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mesh.write();
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}
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else
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{
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Info<< "Mesh unchanged." << endl;
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}
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Info << "End\n" << endl;
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return 0;
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}
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// ************************************************************************* //
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