ENH: Adding mapRegion option to meshToMesh and volume weighted

interpolation method

src/sampling/Make/files

@@ -69,4 +69,8 @@ $(meshToMesh)/meshToMesh.C
 $(meshToMesh)/calculateMeshToMeshAddressing.C
 $(meshToMesh)/calculateMeshToMeshWeights.C
 
+tetOverlapVolume = meshToMeshInterpolation/tetOverlapVolume
+$(tetOverlapVolume)/tetOverlapVolume.C
+
+
 LIB = $(FOAM_LIBBIN)/libsampling

src/sampling/meshToMeshInterpolation/meshToMesh/calculateMeshToMeshWeights.C

@@ -24,6 +24,7 @@ License
 \*---------------------------------------------------------------------------*/
 
 #include "meshToMesh.H"
+#include "tetOverlapVolume.H"
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
@@ -99,6 +100,108 @@ void Foam::meshToMesh::calculateInverseDistanceWeights() const
 }
 
 
+void Foam::meshToMesh::calculateInverseVolumeWeights() const
+{
+    if (debug)
+    {
+        Info<< "meshToMesh::calculateInverseVolumeWeights() : "
+            << "calculating inverse volume weighting factors" << endl;
+    }
+
+    if (inverseVolumeWeightsPtr_)
+    {
+        FatalErrorIn("meshToMesh::calculateInverseVolumeWeights()")
+            << "weighting factors already calculated"
+            << exit(FatalError);
+    }
+
+    inverseVolumeWeightsPtr_ = new scalarListList(toMesh_.nCells());
+    scalarListList& invVolCoeffs = *inverseVolumeWeightsPtr_;
+
+    labelListList& cellToCell = *cellToCellAddressingPtr_;
+
+    tetOverlapVolume overlapEngine;
+
+    forAll(cellToCell, celli)
+    {
+        const labelList& overlapCells = cellToCell[celli];
+
+        if (overlapCells.size() > 0)
+        {
+            invVolCoeffs[celli].setSize(overlapCells.size());
+            scalar v(0);
+            forAll (overlapCells, j)
+            {
+                label cellFrom = overlapCells[j];
+                treeBoundBox bbFromMesh
+                (
+                    pointField
+                    (
+                        fromMesh_.points(),
+                        fromMesh_.cellPoints()[cellFrom]
+                    )
+                );
+
+                v = overlapEngine.cellCellOverlapVolumeMinDecomp
+                (
+                    toMesh_,
+                    celli,
+
+                    fromMesh_,
+                    cellFrom,
+                    bbFromMesh
+                );
+                invVolCoeffs[celli][j] =  v/toMesh_.V()[celli];
+            }
+            if (celli == 2)
+            {
+                Info << "cellToCell :" << cellToCell[celli] << endl;
+                Info << "invVolCoeffs :" << invVolCoeffs[celli] << endl;
+            }
+        }
+    }
+}
+
+
+void  Foam::meshToMesh::calculateCellToCellAddressing() const
+{
+    if (debug)
+    {
+        Info<< "meshToMesh::calculateCellToCellAddressing() : "
+            << "calculating cell to cell addressing" << endl;
+    }
+
+    if (cellToCellAddressingPtr_)
+    {
+        FatalErrorIn("meshToMesh::calculateCellToCellAddressing()")
+            << "addressing already calculated"
+            << exit(FatalError);
+    }
+
+    tetOverlapVolume overlapEngine;
+
+    cellToCellAddressingPtr_ = new labelListList(toMesh_.nCells());
+    labelListList& cellToCell = *cellToCellAddressingPtr_;
+
+
+    forAll(cellToCell, iTo)
+    {
+        const labelList overLapCells =
+            overlapEngine.overlappingCells(fromMesh_, toMesh_, iTo);
+        if (overLapCells.size() > 0)
+        {
+            //Info << "To " << iTo << endl;
+            //Info << "cellToCell " << overLapCells << endl;
+
+            cellToCell[iTo].setSize(overLapCells.size());
+            forAll(overLapCells, j)
+            {
+                cellToCell[iTo][j] = overLapCells[j];
+            }
+        }
+    }
+}
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 const Foam::scalarListList& Foam::meshToMesh::inverseDistanceWeights() const
@@ -112,4 +215,24 @@ const Foam::scalarListList& Foam::meshToMesh::inverseDistanceWeights() const
 }
 
 
+const Foam::scalarListList& Foam::meshToMesh::inverseVolumeWeights() const
+{
+    if (!inverseVolumeWeightsPtr_)
+    {
+        calculateInverseVolumeWeights();
+    }
+
+    return *inverseVolumeWeightsPtr_;
+}
+
+const Foam::labelListList& Foam::meshToMesh::cellToCellAddressing() const
+{
+    if (!cellToCellAddressingPtr_)
+    {
+        calculateCellToCellAddressing();
+    }
+
+    return *cellToCellAddressingPtr_;
+}
+
 // ************************************************************************* //

src/sampling/meshToMeshInterpolation/meshToMesh/meshToMesh.C

@@ -48,7 +48,9 @@ Foam::meshToMesh::meshToMesh
     patchMap_(patchMap),
     cellAddressing_(toMesh_.nCells()),
     boundaryAddressing_(toMesh_.boundaryMesh().size()),
-    inverseDistanceWeightsPtr_(NULL)
+    inverseDistanceWeightsPtr_(NULL),
+    inverseVolumeWeightsPtr_(NULL),
+    cellToCellAddressingPtr_(NULL)
 {
     forAll(fromMesh_.boundaryMesh(), patchi)
     {
@@ -118,7 +120,9 @@ Foam::meshToMesh::meshToMesh
     toMesh_(meshTo),
     cellAddressing_(toMesh_.nCells()),
     boundaryAddressing_(toMesh_.boundaryMesh().size()),
-    inverseDistanceWeightsPtr_(NULL)
+    inverseDistanceWeightsPtr_(NULL),
+    inverseVolumeWeightsPtr_(NULL),
+    cellToCellAddressingPtr_(NULL)
 {
     // check whether both meshes have got the same number
     // of boundary patches
@@ -198,6 +202,8 @@ Foam::meshToMesh::meshToMesh
 Foam::meshToMesh::~meshToMesh()
 {
     deleteDemandDrivenData(inverseDistanceWeightsPtr_);
+    deleteDemandDrivenData(inverseVolumeWeightsPtr_);
+    deleteDemandDrivenData(cellToCellAddressingPtr_);
 }
 
 

src/sampling/meshToMeshInterpolation/meshToMesh/meshToMesh.H

@@ -88,6 +88,12 @@ class meshToMesh
         //- Inverse-distance interpolation weights
         mutable scalarListList* inverseDistanceWeightsPtr_;
 
+        //- Inverse-volume interpolation weights
+        mutable scalarListList* inverseVolumeWeightsPtr_;
+
+        //- Cell to cell overlap addressing
+        mutable labelListList* cellToCellAddressingPtr_;
+
 
     // Private Member Functions
 
@@ -104,8 +110,16 @@ class meshToMesh
 
         void calculateInverseDistanceWeights() const;
 
+        void calculateInverseVolumeWeights() const;
+
+        void calculateCellToCellAddressing() const;
+
         const scalarListList& inverseDistanceWeights() const;
 
+        const scalarListList& inverseVolumeWeights() const;
+
+        const labelListList& cellToCellAddressing() const;
+
 
     // Private static data members
 
@@ -124,7 +138,8 @@ public:
     {
         MAP,
         INTERPOLATE,
-        CELL_POINT_INTERPOLATE
+        CELL_POINT_INTERPOLATE,
+        CELL_VOLUME_WEIGHT
     };
 
 
@@ -239,6 +254,18 @@ public:
                 const CombineOp& cop
             ) const;
 
+            //- Interpolate field using inverse-volume weights
+            template<class Type, class CombineOp>
+            void interpolateField
+            (
+                Field<Type>&,
+                const GeometricField<Type, fvPatchField, volMesh>&,
+                const labelListList& adr,
+                const scalarListList& weights,
+                const CombineOp& cop
+            ) const;
+
+
             //- Interpolate field using cell-point interpolation
             template<class Type, class CombineOp>
             void interpolateField

src/sampling/meshToMeshInterpolation/meshToMesh/meshToMeshInterpolate.C

@@ -54,6 +54,33 @@ void Foam::meshToMesh::mapField
 }
 
 
+template<class Type, class CombineOp>
+void Foam::meshToMesh::interpolateField
+(
+    Field<Type>& toF,
+    const GeometricField<Type, fvPatchField, volMesh>& fromVf,
+    const labelListList& adr,
+    const scalarListList& weights,
+    const CombineOp& cop
+) const
+{
+    // Inverse volume weighted interpolation
+    forAll(toF, celli)
+    {
+        const labelList& overlapCells = adr[celli];
+        const scalarList& w = weights[celli];
+
+        Type f = pTraits<Type>::zero;
+        forAll(overlapCells, i)
+        {
+            label fromCelli = overlapCells[i];
+            f += fromVf[fromCelli]*w[i];
+            cop(toF[celli], f);
+        }
+    }
+}
+
+
 template<class Type, class CombineOp>
 void Foam::meshToMesh::interpolateField
 (
@@ -162,6 +189,7 @@ void Foam::meshToMesh::interpolateInternalField
         break;
 
         case INTERPOLATE:
+        {
             interpolateField
             (
                 toF,
@@ -170,9 +198,10 @@ void Foam::meshToMesh::interpolateInternalField
                 inverseDistanceWeights(),
                 cop
             );
-        break;
-
+            break;
+        }
         case CELL_POINT_INTERPOLATE:
+        {
             interpolateField
             (
                 toF,
@@ -181,8 +210,24 @@ void Foam::meshToMesh::interpolateInternalField
                 toMesh_.cellCentres(),
                 cop
             );
-        break;
 
+            break;
+        }
+        case CELL_VOLUME_WEIGHT:
+        {
+            const labelListList& cellToCell = cellToCellAddressing();
+            const scalarListList& invVolWeights = inverseVolumeWeights();
+
+            interpolateField
+            (
+                toF,
+                fromVf,
+                cellToCell,
+                invVolWeights,
+                cop
+            );
+            break;
+        }
         default:
             FatalErrorIn
             (
@@ -229,6 +274,7 @@ void Foam::meshToMesh::interpolate
             switch(ord)
             {
                 case MAP:
+                {
                     mapField
                     (
                         toVf.boundaryField()[patchi],
@@ -236,9 +282,11 @@ void Foam::meshToMesh::interpolate
                         boundaryAddressing_[patchi],
                         cop
                     );
-                break;
+                    break;
+                }
 
                 case INTERPOLATE:
+                {
                     interpolateField
                     (
                         toVf.boundaryField()[patchi],
@@ -247,9 +295,11 @@ void Foam::meshToMesh::interpolate
                         toPatch.Cf(),
                         cop
                     );
-                break;
+                    break;
+                }
 
                 case CELL_POINT_INTERPOLATE:
+                {
                     interpolateField
                     (
                         toVf.boundaryField()[patchi],
@@ -258,7 +308,13 @@ void Foam::meshToMesh::interpolate
                         toPatch.Cf(),
                         cop
                     );
-                break;
+                    break;
+                }
+                case CELL_VOLUME_WEIGHT:
+                {
+                    // Do nothing
+                    break;
+                }
 
                 default:
                     FatalErrorIn

src/sampling/meshToMeshInterpolation/tetOverlapVolume/tetOverlapVolume.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011 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/>.
+
+
+Class
+    Foam::tetOverlapVolume
+
+Description
+    Calculates overlap volume of two tets.
+
+SourceFiles
+    tetOverlapVolume.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef tetOverlapVolume_H
+#define tetOverlapVolume_H
+
+#include "tetrahedron.H"
+#include "fvMesh.H"
+#include "plane.H"
+#include "tetPointRef.H"
+#include "OFstream.H"
+#include "meshTools.H"
+#include "indexedOctree.H"
+#include "treeDataCell.H"
+#include "tetPoints.H"
+#include "tetCell.H"
+#include "EdgeMap.H"
+
+namespace Foam
+{
+
+/*---------------------------------------------------------------------------*\
+                         Class tetOverlapVolume Declaration
+\*---------------------------------------------------------------------------*/
+
+class tetOverlapVolume
+{
+    // Private member functions
+
+        //- Plane intersection
+        inline point planeIntersection
+        (
+            const FixedList<scalar, 4>& d,
+            const tetPoints& t,
+            const label negI,
+            const label posI
+        );
+
+
+        //- Decompose prism
+        template <class TetOp> inline void decomposePrism
+        (
+            const FixedList<point, 6>& points,
+            TetOp& op
+        );
+
+
+        //- Helping cľasses
+        class dummyTetOp
+        {
+         public:
+
+            inline void operator()(const tetPoints&){}
+        };
+
+
+        class sumTetVolOp
+        {
+         public:
+            scalar vol_;
+
+            inline sumTetVolOp()
+            :
+                vol_(0.0)
+            {}
+
+            inline void operator()(const tetPoints& tet)
+            {
+                vol_ += tet.tet().mag();
+            }
+        };
+
+
+        class storeTetOp
+        {
+            FixedList<tetPoints, 200>& tets_;
+            label& nTets_;
+
+         public:
+
+            inline storeTetOp(FixedList<tetPoints, 200>& tets, label& nTets)
+            :
+                tets_(tets),
+                nTets_(nTets)
+            {}
+
+            inline void operator()(const tetPoints& tet)
+            {
+                tets_[nTets_++] = tet;
+            }
+        };
+
+
+        //- Slice. Split tet into subtets above and below plane
+        template <class AboveTetOp, class BelowTetOp>
+        inline void tetSliceWithPlane
+        (
+            const tetPoints& tet,
+            const plane& pl,
+
+            AboveTetOp& aboveOp,
+            BelowTetOp& belowOp
+        );
+
+
+        //- Tet overlap
+        void tetTetOverlap
+        (
+            const tetPoints& tetA,
+            const tetPoints& tetB,
+            FixedList<tetPoints, 200>& insideTets,
+            label& nInside,
+            FixedList<tetPoints, 200>& outsideTets,
+            label& nOutside
+        );
+
+
+        //- Tet Overlap Vol
+        inline scalar tetTetOverlapVol
+        (
+            const tetPoints& tetA,
+            const tetPoints& tetB
+        );
+
+
+        //- Return a const treeBoundBox
+        inline const treeBoundBox pyrBb
+        (
+            const pointField& points,
+            const face& f,
+            const point& fc
+        );
+
+
+public:
+
+
+    //- Runtime type information
+    TypeName("tetOverlapVolume");
+
+
+    // Constructors
+
+        //- Null constructor
+        tetOverlapVolume();
+
+
+    //- Destructor
+     virtual ~tetOverlapVolume();
+
+
+    // Public members
+
+        //- Return a list of cells in meshA which overlaps with cellBI in
+        // meshB
+        labelList overlappingCells
+        (
+            const fvMesh& meshA,
+            const fvMesh& meshB,
+            const label cellBI
+        ) const;
+
+
+        //- Calculates the overlap volume
+        scalar cellCellOverlapVolumeMinDecomp
+        (
+            const primitiveMesh& meshA,
+            const label cellAI,
+
+            const primitiveMesh& meshB,
+            const label cellBI,
+            const treeBoundBox& cellBbB
+        );
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace Foam
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //

src/sampling/meshToMeshInterpolation/tetOverlapVolume/tetPoints.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2011-2011 OpenCFD Ltd.
+     \\/     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