refineWallLayer.C

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/*---------------------------------------------------------------------------*\
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    \\  /    A nd           | Copyright (C) 2011-2025 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/>.
 
Application
    refineWallLayer
 
Description
    Utility to refine cells next to patches.
 
    Arguments:
        1: List of patch name regular expressions
        2: The size of the refined cells as a fraction of the edge-length.
 
    Examples:
        Split the near-wall cells of patch Wall in the middle
            refineWallLayer "(Wall)" 0.5
 
        Split the near-wall cells of patch Wall in the middle
        within the cellSet box
            refineWallLayer "(Wall)" 0.5 -inSet box
 
        Split the near-wall cells of patches Wall1 and Wall2 in the middle
            refineWallLayer "(Wall1 Wall2)" 0.5
 
        Split the near-wall cells of all patches with names beginning with wall
        with the near-wall cells 10% of the thickness of the original cells
            refineWallLayer '("Wall.*")' 0.1
 
\*---------------------------------------------------------------------------*/
 
#include "argList.H"
#include "Time.H"
#include "polyTopoChange.H"
#include "cellCuts.H"
#include "cellSet.H"
#include "meshCutter.H"
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    #include "addNoOverwriteOption.H"
    #include "addNoOverwriteOption.H"
    #include "addRegionOption.H"
    argList::noParallel();
    argList::validArgs.append("patches");
    argList::validArgs.append("edgeFraction");
 
    argList::addOption
    (
        "inSet",
        "name",
        "Restrict cells to refine to those in specified cellSet"
    );
 
    #include "setRootCase.H"
    #include "createTimeNoFunctionObjects.H"
 
    Foam::word meshRegionName = polyMesh::defaultRegion;
    args.optionReadIfPresent("region", meshRegionName);
 
    #include "createSpecifiedPolyMesh.H"
    const word oldInstance = mesh.pointsInstance();
 
    // Find set of patches from the list of regular expressions provided
    const wordReList patches((IStringStream(args[1])()));
    const labelHashSet patchSet(mesh.boundaryMesh().patchSet(patches));
 
    const scalar weight  = args.argRead<scalar>(2);
    #include "setNoOverwrite.H"
 
    if (!patchSet.size())
    {
        FatalErrorInFunction
            << "Cannot find any patches in set " << patches << endl
            << "Valid patches are " << mesh.boundaryMesh().names()
            << exit(FatalError);
    }
 
    label nPatchFaces = 0;
    label nPatchEdges = 0;
 
    forAllConstIter(labelHashSet, patchSet, iter)
    {
        nPatchFaces += mesh.boundaryMesh()[iter.key()].size();
        nPatchEdges += mesh.boundaryMesh()[iter.key()].nEdges();
    }
 
    // Construct from estimate for the number of cells to refine
    labelHashSet cutCells(4*nPatchFaces);
 
    // Construct from total patch edges in selected patches
    DynamicList<label> allCutEdges(nPatchEdges);
    DynamicList<scalar> allCutEdgeWeights(nPatchEdges);
 
    // Find cells to refine
    forAllConstIter(labelHashSet, patchSet, iter)
    {
        const polyPatch& pp = mesh.boundaryMesh()[iter.key()];
        const labelList& meshPoints = pp.meshPoints();
 
        forAll(meshPoints, pointi)
        {
            const label meshPointi = meshPoints[pointi];
 
            const labelList& pCells = mesh.pointCells()[meshPointi];
 
            forAll(pCells, pCelli)
            {
                cutCells.insert(pCells[pCelli]);
            }
        }
    }
 
    word setName;
    if (args.optionReadIfPresent("inSet", setName))
    {
        Info<< "Restrict cells to refine to those in cellSet "
            << setName << endl;
 
        const cellSet cellsToRefine(mesh, setName);
 
        Info<< "    Read " << cellsToRefine.size()
            << " cells from cellSet " << cellsToRefine.relativeObjectPath()
            << nl << endl;
 
        forAllIter(labelHashSet, cutCells, iter)
        {
            if (!cellsToRefine.found(iter.key()))
            {
                cutCells.erase(iter);
            }
        }
    }
 
    // Mark all mesh points on patch
    boolList vertOnPatch(mesh.nPoints(), false);
 
    forAllConstIter(labelHashSet, patchSet, iter)
    {
        const polyPatch& pp = mesh.boundaryMesh()[iter.key()];
        const labelList& meshPoints = pp.meshPoints();
 
        forAll(meshPoints, pointi)
        {
            vertOnPatch[meshPoints[pointi]] = true;
        }
    }
 
    forAllConstIter(labelHashSet, patchSet, iter)
    {
        const polyPatch& pp = mesh.boundaryMesh()[iter.key()];
        const labelList& meshPoints = pp.meshPoints();
 
        forAll(meshPoints, pointi)
        {
            const label meshPointi = meshPoints[pointi];
 
            const labelList& pEdges = mesh.pointEdges()[meshPointi];
 
            forAll(pEdges, pEdgeI)
            {
                const label edgeI = pEdges[pEdgeI];
                const edge& e = mesh.edges()[edgeI];
 
                label otherPointi = e.otherVertex(meshPointi);
 
                if (!vertOnPatch[otherPointi])
                {
                    allCutEdges.append(edgeI);
 
                    if (e.start() == meshPointi)
                    {
                        allCutEdgeWeights.append(weight);
                    }
                    else
                    {
                        allCutEdgeWeights.append(1 - weight);
                    }
                }
            }
        }
    }
 
    allCutEdges.shrink();
    allCutEdgeWeights.shrink();
 
    Info<< "Refining:" << nl
        << "    cells:" << cutCells.size() << nl
        << "    edges:" << allCutEdges.size() << endl;
 
    // Transfer DynamicLists to straight ones.
    scalarField cutEdgeWeights;
    cutEdgeWeights.transfer(allCutEdgeWeights);
    allCutEdgeWeights.clear();
 
 
    // Gets cuts across cells from cuts through edges.
    cellCuts cuts
    (
        mesh,
        cutCells.toc(),     // cells candidate for cutting
        labelList(0),       // cut vertices
        allCutEdges,        // cut edges
        cutEdgeWeights      // weight on cut edges
    );
 
    polyTopoChange meshMod(mesh);
 
    // Cutting engine
    meshCutter cutter(mesh);
 
    // Insert mesh refinement into polyTopoChange.
    cutter.setRefinement(cuts, meshMod);
 
    if (!overwrite)
    {
        runTime++;
    }
 
    autoPtr<polyTopoChangeMap> map = meshMod.changeMesh(mesh);
 
    // Update stored labels on meshCutter.
    cutter.topoChange(map());
 
    Info<< "Finished refining" << endl;
 
    if (overwrite)
    {
        mesh.setInstance(oldInstance);
    }
 
    // Write resulting mesh
    Info<< "Writing refined mesh to time " << runTime.name() << endl;
 
    mesh.write();
 
    Info<< "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //