regionSplit2D.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2015-2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
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#include "regionSplit2D.H"
#include "polyMesh.H"
#include "PatchEdgeFaceWave.H"
#include "edgeTopoDistanceData.H"


// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

static constexpr Foam::label UNASSIGNED = -1;
static constexpr Foam::label BLOCKED = -2;


// * * * * * * * * * * * * * * * * Constructor * * * * * * * * * * * * * * * //

Foam::regionSplit2D::regionSplit2D
(
    const polyMesh& mesh,
    const indirectPrimitivePatch& patch,
    const boolList& blockedFaces,
    const label offset
)
:
    labelList(patch.size(), UNASSIGNED),
    nRegions_(0)
{
    globalIndex globalFaces(blockedFaces.size());
    label regionI = globalFaces.toGlobal(0);
    List<edgeTopoDistanceData<label>> allEdgeInfo(patch.nEdges());
    List<edgeTopoDistanceData<label>> allFaceInfo(patch.size());
    DynamicList<label> changedEdges;
    DynamicList<edgeTopoDistanceData<label>> changedRegions;

    label nBlockedFaces = 0;
    forAll(blockedFaces, facei)
    {
        if (blockedFaces.test(facei))
        {
            for (const label edgei : patch.faceEdges()[facei])
            {
                changedEdges.append(edgei);

                // Append globally unique value
                changedRegions.append
                (
                    edgeTopoDistanceData<label>
                    (
                        0,              // distance
                        regionI         // passive data
                    )
                );
            }
            nBlockedFaces++;
            regionI++;
        }
        else
        {
            // Block all non-seeded faces from the walk
            allFaceInfo[facei] = edgeTopoDistanceData<label>
            (
                0,              // distance
                BLOCKED         // passive data
            );
        }
    }

    // Early exit if there are no blocked faces
    if (!returnReduceOr(nBlockedFaces))
    {
        return;
    }

    PatchEdgeFaceWave
    <
        indirectPrimitivePatch,
        edgeTopoDistanceData<label>
    >
    (
        mesh,
        patch,
        changedEdges,
        changedRegions,
        allEdgeInfo,
        allFaceInfo,
        returnReduce(patch.nEdges(), sumOp<label>())
    );


    // Map from regions to local compact indexing
    // - only for regions that originate from this processor
    Map<label> regionToCompactAddr(changedRegions.size());
    label compactRegionI = 0;
    forAll(allFaceInfo, faceI)
    {
        label regionI = allFaceInfo[faceI].data();
        if
        (
            globalFaces.isLocal(regionI)
         && regionToCompactAddr.insert(regionI, compactRegionI)
        )
        {
            compactRegionI++;
        }
    }

    // In-place renumber the local regionI to global (compact) regionI
    globalIndex giCompact(compactRegionI);
    forAllIters(regionToCompactAddr, iter)
    {
        *iter = giCompact.toGlobal(*iter);
    }

    // Ensure regionToCompactAddr consistent across all processors
    // - not concerned about the op (keys are unique)
    // - map size will be the number of regions in the set of faces
    Pstream::mapCombineReduce(regionToCompactAddr, minEqOp<label>());

    nRegions_ = regionToCompactAddr.size();

    // Set the region index per face
    forAll(allFaceInfo, faceI)
    {
        label regionI = allFaceInfo[faceI].data();
        if (regionI >= 0)
        {
            this->operator[](faceI) = regionToCompactAddr[regionI] + offset;
        }
    }
}


// ************************************************************************* //