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ENH: snappyHexMesh: add different method for cellZone-faceZone consistency. Fixes #629.

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This commit is contained in:
mattijs
2017-10-26 12:08:15 +01:00
parent 9d334e5601
commit 4818b5808e
6 changed files with 188 additions and 18 deletions
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8
applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
View File

@ -378,6 +378,14 @@ castellatedMeshControls
// Optional: do not refine surface cells with opposite faces of
// differing refinement levels
//interfaceRefine false;
// Optional: use an erosion instead of region assignment to allocate
// left-over cells to the background region (i.e. make cellZones
// consistent with the intersections of the surface).
// Erosion is specified as a number of erosion iterations.
// Erosion has less chance of bleeding and changing the zone
// for a complete region.
//nCellZoneErodeIter 2;
}
// Settings for the snapping.

16
src/mesh/snappyHexMesh/meshRefinement/meshRefinement.H
View File

@ -511,6 +511,7 @@ private:
//- Determine patches for baffles
void getBafflePatches
(
const label nErodeCellZones,
const labelList& globalToMasterPatch,
const pointField& locationsInMesh,
const wordList& regionsInMesh,
@ -673,6 +674,17 @@ private:
labelList& cellToZone
) const;
//- Opposite of findCellTopo: finds assigned cell connected to
// an unassigned one and puts it in the background zone.
void erodeCellZone
(
const label nErodeCellZones,
const label backgroundZoneID,
const labelList& unnamedSurfaceRegion,
const labelList& namedSurfaceIndex,
labelList& cellToZone
) const;
//- Make namedSurfaceIndex consistent with cellToZone
// - clear out any blocked faces inbetween same cell zone.
void makeConsistentFaceIndex
@ -686,6 +698,7 @@ private:
void zonify
(
const bool allowFreeStandingZoneFaces,
const label nErodeCellZones,
const label backgroundZoneID,
const pointField& locationsInMesh,
const wordList& zonesInMesh,
@ -1037,6 +1050,7 @@ public:
const bool useTopologicalSnapDetection,
const bool removeEdgeConnectedCells,
const scalarField& perpendicularAngle,
const label nErodeCellZones,
const dictionary& motionDict,
Time& runTime,
const labelList& globalToMasterPatch,
@ -1067,6 +1081,7 @@ public:
autoPtr<mapPolyMesh> splitMesh
(
const label nBufferLayers,
const label nErodeCellZones,
const labelList& globalToMasterPatch,
const labelList& globalToSlavePatch,
@ -1148,6 +1163,7 @@ public:
autoPtr<mapPolyMesh> zonify
(
const bool allowFreeStandingZoneFaces,
const label nErodeCellZones,
const pointField& locationsInMesh,
const wordList& regionsInMesh,
wordPairHashTable& zonesToFaceZone

167
src/mesh/snappyHexMesh/meshRefinement/meshRefinementBaffles.C
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2014 OpenFOAM Foundation
\\/ M anipulation | Copyright (C) 2015-2016 OpenCFD Ltd.
\\/ M anipulation | Copyright (C) 2015-2017 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -279,6 +279,7 @@ void Foam::meshRefinement::getIntersections
void Foam::meshRefinement::getBafflePatches
(
const label nErodeCellZones,
const labelList& globalToMasterPatch,
const pointField& locationsInMesh,
const wordList& zonesInMesh,
@ -309,6 +310,7 @@ void Foam::meshRefinement::getBafflePatches
zonify
(
true, // allowFreeStandingZoneFaces
nErodeCellZones,
-2, // zone to put unreached cells into
locationsInMesh,
zonesInMesh,
@ -331,16 +333,13 @@ void Foam::meshRefinement::getBafflePatches
labelList neiCellZone;
syncTools::swapBoundaryCellList(mesh_, cellToZone, neiCellZone);
const labelList testFaces(intersectedFaces());
ownPatch.setSize(mesh_.nFaces());
ownPatch = -1;
neiPatch.setSize(mesh_.nFaces());
neiPatch = -1;
forAll(testFaces, i)
{
label faceI = testFaces[i];
forAll(ownPatch, faceI)
{
if (unnamedRegion1[faceI] != -1 || unnamedRegion2[faceI] != -1)
{
label ownMasterPatch = -1;
@ -2060,6 +2059,111 @@ void Foam::meshRefinement::findCellZoneTopo
}
void Foam::meshRefinement::erodeCellZone
(
const label nErodeCellZones,
const label backgroundZoneID,
const labelList& unnamedSurfaceRegion,
const labelList& namedSurfaceIndex,
labelList& cellToZone
) const
{
// This routine fixes small problems with left over unassigned regions
// (after all off the unreachable bits of the mesh have been removed).
// The problem is that the cell zone information might be inconsistent
// with the face zone information. So what we do here is to erode
// any cell zones until we hit a named face.
// - backgroundZoneID = -2 : do not change so remove cells
// - backgroundZoneID = -1 : put into background
// Note that is the opposite of findCellZoneTopo which moves unassigned
// regions into a neighbouring region(=cellZone) unless there is an
// intersected faces inbetween the two.
for (label iter = 0; iter < nErodeCellZones; iter++)
{
label nChanged = 0;
labelList erodedCellToZone(cellToZone);
// Do internal faces
for (label facei = 0; facei < mesh_.nInternalFaces(); facei++)
{
if
(
unnamedSurfaceRegion[facei] == -1
&& namedSurfaceIndex[facei] == -1
)
{
label own = mesh_.faceOwner()[facei];
label nei = mesh_.faceNeighbour()[facei];
if (cellToZone[own] == -2 && cellToZone[nei] >= -1)
{
erodedCellToZone[nei] = backgroundZoneID;
nChanged++;
}
else if (cellToZone[nei] == -2 && cellToZone[own] >= -1)
{
erodedCellToZone[own] = backgroundZoneID;
nChanged++;
}
}
}
// Do boundary faces
const polyBoundaryMesh& patches = mesh_.boundaryMesh();
// Get coupled neighbour cellRegion
labelList neiCellZone;
syncTools::swapBoundaryCellList(mesh_, cellToZone, neiCellZone);
// Calculate region to zone from cellRegions on either side of coupled
// face.
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled())
{
forAll(pp, i)
{
label facei = pp.start()+i;
if
(
unnamedSurfaceRegion[facei] == -1
&& namedSurfaceIndex[facei] == -1
)
{
label own = mesh_.faceOwner()[facei];
label bFacei = facei-mesh_.nInternalFaces();
if (neiCellZone[bFacei] == -2 && cellToZone[own] >= -1)
{
erodedCellToZone[own] = backgroundZoneID;
nChanged++;
}
}
}
}
}
cellToZone.transfer(erodedCellToZone);
reduce(nChanged, sumOp<label>());
if (debug)
{
Pout<< "erodeCellZone : eroded " << nChanged
<< " cells (moved from cellZone to background zone "
<< backgroundZoneID << endl;
}
if (nChanged == 0)
{
break;
}
}
}
void Foam::meshRefinement::makeConsistentFaceIndex
(
const labelList& surfaceMap,
@ -2281,6 +2385,7 @@ void Foam::meshRefinement::getIntersections
void Foam::meshRefinement::zonify
(
const bool allowFreeStandingZoneFaces,
const label nErodeCellZones,
const label backgroundZoneID,
const pointField& locationsInMesh,
const wordList& zonesInMesh,
@ -2496,18 +2601,39 @@ void Foam::meshRefinement::zonify
if (namedSurfaces.size())
{
Info<< "Walking from known cellZones; crossing a faceZone "
<< "face changes cellZone" << nl << endl;
if (nErodeCellZones <= 0)
{
Info<< "Walking from known cellZones; crossing a faceZone "
<< "face changes cellZone" << nl << endl;
// Put unassigned regions into any connected cellZone
findCellZoneTopo
(
backgroundZoneID,
pointField(0),
unnamedRegion1, // Intersections with unnamed surfaces
namedSurfaceIndex, // Intersections with named surfaces
surfaceToCellZone,
cellToZone
);
}
else
{
Info<< "Eroding cellZone cells to make these consistent with"
<< " faceZone faces" << nl << endl;
// Erode cell zone cells (connected to an unassigned cell)
// and put them into backgroundZone
erodeCellZone
(
nErodeCellZones,
backgroundZoneID,
unnamedRegion1,
namedSurfaceIndex,
cellToZone
);
}
findCellZoneTopo
(
backgroundZoneID,
pointField(0),
unnamedRegion1, // Intersections with unnamed surfaces
namedSurfaceIndex, // Intersections with named surfaces
surfaceToCellZone,
cellToZone
);
// Make sure namedSurfaceIndex is unset inbetween same cell zones.
if (!allowFreeStandingZoneFaces)
@ -3424,6 +3550,7 @@ void Foam::meshRefinement::baffleAndSplitMesh
const bool useTopologicalSnapDetection,
const bool removeEdgeConnectedCells,
const scalarField& perpendicularAngle,
const label nErodeCellZones,
const dictionary& motionDict,
Time& runTime,
const labelList& globalToMasterPatch,
@ -3452,6 +3579,7 @@ void Foam::meshRefinement::baffleAndSplitMesh
labelList ownPatch, neiPatch;
getBafflePatches
(
nErodeCellZones,
globalToMasterPatch,
locationsInMesh,
@ -3522,6 +3650,7 @@ void Foam::meshRefinement::baffleAndSplitMesh
labelList ownPatch, neiPatch;
getBafflePatches
(
nErodeCellZones,
globalToMasterPatch,
locationsInMesh,
@ -3689,6 +3818,7 @@ void Foam::meshRefinement::mergeFreeStandingBaffles
Foam::autoPtr<Foam::mapPolyMesh> Foam::meshRefinement::splitMesh
(
const label nBufferLayers,
const label nErodeCellZones,
const labelList& globalToMasterPatch,
const labelList& globalToSlavePatch,
@ -3709,6 +3839,7 @@ Foam::autoPtr<Foam::mapPolyMesh> Foam::meshRefinement::splitMesh
labelList ownPatch, neiPatch;
getBafflePatches
(
nErodeCellZones,
globalToMasterPatch,
locationsInMesh,
@ -4202,6 +4333,7 @@ Foam::meshRefinement::dupNonManifoldBoundaryPoints()
Foam::autoPtr<Foam::mapPolyMesh> Foam::meshRefinement::zonify
(
const bool allowFreeStandingZoneFaces,
const label nErodeCellZones,
const pointField& locationsInMesh,
const wordList& zonesInMesh,
wordPairHashTable& zonesToFaceZone
@ -4278,6 +4410,7 @@ Foam::autoPtr<Foam::mapPolyMesh> Foam::meshRefinement::zonify
zonify
(
allowFreeStandingZoneFaces,
nErodeCellZones,// Use erosion (>0) or regionSplit to clean up
-1, // Set all cells with cellToZone -2 to -1
locationsInMesh,
zonesInMesh,

3
src/mesh/snappyHexMesh/snappyHexMeshDriver/refinementParameters/refinementParameters.C
View File

@ -68,7 +68,8 @@ Foam::refinementParameters::refinementParameters(const dictionary& dict)
interfaceRefine_
(
dict.lookupOrDefault<Switch>("interfaceRefine", true)
)
),
nErodeCellZone_(dict.lookupOrDefault<label>("nCellZoneErodeIter", 0))
{
point locationInMesh;
if (dict.readIfPresent("locationInMesh", locationInMesh))

8
src/mesh/snappyHexMesh/snappyHexMeshDriver/refinementParameters/refinementParameters.H
View File

@ -106,6 +106,9 @@ class refinementParameters
Switch interfaceRefine_;
label nErodeCellZone_;
// Private Member Functions
//- Disallow default bitwise copy construct
@ -212,6 +215,11 @@ public:
return interfaceRefine_;
}
label nErodeCellZone() const
{
return nErodeCellZone_;
}
// Other

4
src/mesh/snappyHexMesh/snappyHexMeshDriver/snappyRefineDriver.C
View File

@ -1362,6 +1362,7 @@ void Foam::snappyRefineDriver::removeInsideCells
meshRefiner_.splitMesh
(
nBufferLayers, // nBufferLayers
refineParams.nErodeCellZone(),
globalToMasterPatch_,
globalToSlavePatch_,
refineParams.locationsInMesh(),
@ -1605,6 +1606,7 @@ void Foam::snappyRefineDriver::baffleAndSplitMesh
refineParams.useTopologicalSnapDetection(),
false, // perpendicular edge connected cells
scalarField(0), // per region perpendicular angle
refineParams.nErodeCellZone(),
motionDict,
const_cast<Time&>(mesh.time()),
@ -1672,6 +1674,7 @@ void Foam::snappyRefineDriver::zonify
meshRefiner_.zonify
(
refineParams.allowFreeStandingZoneFaces(),
refineParams.nErodeCellZone(),
refineParams.locationsInMesh(),
refineParams.zonesInMesh(),
zonesToFaceZone
@ -1731,6 +1734,7 @@ void Foam::snappyRefineDriver::splitAndMergeBaffles
refineParams.useTopologicalSnapDetection(),
handleSnapProblems, // remove perp edge connected cells
perpAngle, // perp angle
refineParams.nErodeCellZone(),
motionDict,
const_cast<Time&>(mesh.time()),