pointConstraints.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2013-2025 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/>.
 
\*---------------------------------------------------------------------------*/
 
#include "pointConstraints.H"
#include "emptyPointPatch.H"
#include "wedgePointPatch.H"
#include "polyMesh.H"
#include "pointMesh.H"
#include "globalMeshData.H"
#include "twoDPointCorrector.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(pointConstraints, 0);
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::pointConstraints::makePatchPatchAddressing()
{
    if (debug)
    {
        Pout<< "pointConstraints::makePatchPatchAddressing() : "
            << "constructing boundary addressing"
            << endl << incrIndent;
    }
 
    const pointMesh& pMesh = mesh();
    const polyMesh& mesh = pMesh();
 
    const pointBoundaryMesh& pbm = pMesh.boundary();
    const polyBoundaryMesh& bm = mesh.boundaryMesh();
 
 
    // first count the total number of patch-patch points
 
    label nPatchPatchPoints = 0;
 
    forAll(pbm, patchi)
    {
        if
        (
            !isA<emptyPointPatch>(pbm[patchi])
         && !isA<wedgePointPatch>(pbm[patchi])
         && !pbm[patchi].coupled()
        )
        {
            const labelList& bp = bm[patchi].boundaryPoints();
 
            nPatchPatchPoints += bp.size();
 
            if (debug)
            {
                Pout<< indent << "On patch:" << pbm[patchi].name()
                    << " nBoundaryPoints:" << bp.size() << endl;
            }
        }
    }
 
    if (debug)
    {
        Pout<< indent << "Found nPatchPatchPoints:" << nPatchPatchPoints
            << endl;
    }
 
 
    // Go through all patches and mark up the external edge points
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
    // From meshpoint to index in patchPatchPointConstraints_.
    Map<label> patchPatchPointSet(2*nPatchPatchPoints);
 
    // Constraints (initialised to unconstrained)
    patchPatchPointConstraints_.setSize(nPatchPatchPoints, pointConstraint());
 
    // From constraint index to mesh point
    labelList patchPatchPoints(nPatchPatchPoints);
 
    label pppi = 0;
 
    forAll(pbm, patchi)
    {
        if
        (
            !isA<emptyPointPatch>(pbm[patchi])
         && !isA<wedgePointPatch>(pbm[patchi])
         && !pbm[patchi].coupled()
        )
        {
            const labelList& bp = bm[patchi].boundaryPoints();
            const labelList& meshPoints = pbm[patchi].meshPoints();
 
            forAll(bp, pointi)
            {
                label ppp = meshPoints[bp[pointi]];
 
                Map<label>::iterator iter = patchPatchPointSet.find(ppp);
 
                label constraintI = -1;
 
                if (iter == patchPatchPointSet.end())
                {
                    patchPatchPointSet.insert(ppp, pppi);
                    patchPatchPoints[pppi] = ppp;
                    constraintI = pppi++;
                }
                else
                {
                    constraintI = iter();
                }
 
                // Apply to patch constraints
                pbm[patchi].applyConstraint
                (
                    bp[pointi],
                    patchPatchPointConstraints_[constraintI]
                );
            }
        }
    }
 
    if (debug)
    {
        Pout<< indent << "Have (local) constrained points:"
            << nPatchPatchPoints << endl;
    }
 
 
    // Extend set with constraints across coupled points
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
    {
        const globalMeshData& gd = mesh.globalData();
        const labelListList& globalPointSlaves = gd.globalPointSlaves();
        const distributionMap& globalPointSlavesMap = gd.globalPointSlavesMap();
        const Map<label>& cpPointMap = gd.coupledPatch().meshPointMap();
        const labelList& cpMeshPoints = gd.coupledPatch().meshPoints();
 
        // Constraints on coupled points
        List<pointConstraint> constraints
        (
            globalPointSlavesMap.constructSize()
        );
 
        // Copy from patchPatch constraints into coupledConstraints.
        forAll(pbm, patchi)
        {
            if
            (
                !isA<emptyPointPatch>(pbm[patchi])
             && !isA<wedgePointPatch>(pbm[patchi])
             && !pbm[patchi].coupled()
            )
            {
                const labelList& bp = bm[patchi].boundaryPoints();
                const labelList& meshPoints = pbm[patchi].meshPoints();
 
                forAll(bp, pointi)
                {
                    label ppp = meshPoints[bp[pointi]];
 
                    Map<label>::const_iterator fnd = cpPointMap.find(ppp);
                    if (fnd != cpPointMap.end())
                    {
                        // Can just copy (instead of apply) constraint
                        // will already be consistent across multiple patches.
                        constraints[fnd()] = patchPatchPointConstraints_
                        [
                            patchPatchPointSet[ppp]
                        ];
                    }
                }
            }
        }
 
        // Exchange data
        globalPointSlavesMap.distribute(constraints);
 
        // Combine master with slave constraints
        forAll(globalPointSlaves, pointi)
        {
            const labelList& slaves = globalPointSlaves[pointi];
 
            // Combine master constraint with slave constraints
            forAll(slaves, i)
            {
                constraints[pointi].combine(constraints[slaves[i]]);
            }
            // Duplicate master constraint into slave slots
            forAll(slaves, i)
            {
                constraints[slaves[i]] = constraints[pointi];
            }
        }
 
        // Send back
        globalPointSlavesMap.reverseDistribute
        (
            cpMeshPoints.size(),
            constraints
        );
 
        // Add back into patchPatch constraints
        forAll(constraints, coupledPointi)
        {
            if (constraints[coupledPointi].first() != 0)
            {
                label meshPointi = cpMeshPoints[coupledPointi];
 
                Map<label>::iterator iter = patchPatchPointSet.find(meshPointi);
 
                label constraintI = -1;
 
                if (iter == patchPatchPointSet.end())
                {
                    // Pout<< indent << "on meshpoint:" << meshPointi
                    //    << " coupled:" << coupledPointi
                    //    << " at:" << mesh.points()[meshPointi]
                    //    << " have new constraint:"
                    //    << constraints[coupledPointi]
                    //    << endl;
 
                    // Allocate new constraint
                    if (patchPatchPoints.size() <= pppi)
                    {
                        patchPatchPoints.setSize(pppi+100);
                    }
                    patchPatchPointSet.insert(meshPointi, pppi);
                    patchPatchPoints[pppi] = meshPointi;
                    constraintI = pppi++;
                }
                else
                {
                    // Pout<< indent << "on meshpoint:" << meshPointi
                    //    << " coupled:" << coupledPointi
                    //    << " at:" << mesh.points()[meshPointi]
                    //    << " have possibly extended constraint:"
                    //    << constraints[coupledPointi]
                    //    << endl;
 
                    constraintI = iter();
                }
 
                // Extend the patchPatchPointConstraints_ array if necessary
                if (patchPatchPointConstraints_.size() <= constraintI)
                {
                    patchPatchPointConstraints_.setSize
                    (
                        constraintI + 1,
                        pointConstraint()
                    );
                }
 
                // Combine (new or existing) constraint with one
                // on coupled.
                patchPatchPointConstraints_[constraintI].combine
                (
                    constraints[coupledPointi]
                );
            }
        }
    }
 
 
    nPatchPatchPoints = pppi;
    patchPatchPoints.setSize(nPatchPatchPoints);
    patchPatchPointConstraints_.setSize(nPatchPatchPoints);
 
 
    if (debug)
    {
        Pout<< indent << "Have (global) constrained points:"
            << nPatchPatchPoints << endl;
    }
 
 
    // Copy out all non-trivial constraints
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
    patchPatchPointConstraintPoints_.setSize(nPatchPatchPoints);
    patchPatchPointConstraintTensors_.setSize(nPatchPatchPoints);
 
    label nConstraints = 0;
 
    forAll(patchPatchPointConstraints_, i)
    {
        // Note: check for more than zero constraints. (could check for
        //       more than one constraint but what about coupled points that
        //       inherit the constraintness)
        if (patchPatchPointConstraints_[i].first() != 0)
        {
            patchPatchPointConstraintPoints_[nConstraints] =
                patchPatchPoints[i];
 
            patchPatchPointConstraintTensors_[nConstraints] =
                patchPatchPointConstraints_[i].constraintTransformation();
 
            nConstraints++;
        }
    }
 
    if (debug)
    {
        Pout<< indent << "Have non-trivial constrained points:"
            << nConstraints << endl;
    }
 
    patchPatchPointConstraints_.setSize(nConstraints);
    patchPatchPointConstraintPoints_.setSize(nConstraints);
    patchPatchPointConstraintTensors_.setSize(nConstraints);
 
 
    if (debug)
    {
        Pout<< decrIndent
            << "pointConstraints::makePatchPatchAddressing() : "
            << "finished constructing boundary addressing"
            << endl;
    }
}
 
 
// * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
 
Foam::pointConstraints::pointConstraints(const pointMesh& pm)
:
    DemandDrivenMeshObject
    <
        pointMesh,
        TopoChangeableMeshObject,
        pointConstraints
    >(pm)
{
    if (debug)
    {
        Pout<< "pointConstraints::pointConstraints(const pointMesh&): "
            << "Constructing from pointMesh " << pm.name()
            << endl;
    }
 
    makePatchPatchAddressing();
}
 
 
// * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * * //
 
Foam::pointConstraints::~pointConstraints()
{
    if (debug)
    {
        Pout<< "pointConstraints::~pointConstraints()" << endl;
    }
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
bool Foam::pointConstraints::movePoints()
{
    return true;
}
 
 
void Foam::pointConstraints::topoChange(const polyTopoChangeMap&)
{
    makePatchPatchAddressing();
}
 
 
void Foam::pointConstraints::mapMesh(const polyMeshMap&)
{
    makePatchPatchAddressing();
}
 
 
void Foam::pointConstraints::distribute(const polyDistributionMap& map)
{
    FatalErrorInFunction << abort(FatalError);
    makePatchPatchAddressing();
}
 
 
void Foam::pointConstraints::constrainDisplacement
(
    pointVectorField& pf,
    const bool overrideFixedValue
) const
{
    // Override constrained pointPatchField types with the constraint value.
    // This relies on only constrained pointPatchField implementing the evaluate
    // function
    pf.correctBoundaryConditions();
 
    // Sync any dangling points
    syncUntransformedData
    (
        pf.mesh()(),
        pf.primitiveFieldRef(),
        maxMagSqrEqOp<vector>()
    );
 
    // Apply multiple constraints on edge/corner points
    constrainCorners(pf);
 
    // Apply any 2D motion constraints (or should they go before
    // corner constraints?)
    twoDPointCorrector::New(mesh()()).correctDisplacement
    (
        mesh()().points(),
        pf.primitiveFieldRef()
    );
 
    if (overrideFixedValue)
    {
        setPatchFields(pf);
    }
}
 
 
template<>
void Foam::pointConstraints::constrainCorners<Foam::scalar>
(
    PointField<scalar>& pf
) const
{}
 
 
template<>
void Foam::pointConstraints::constrainCorners<Foam::label>
(
    PointField<label>& pf
) const
{}
 
 
// ************************************************************************* //