ENH: displacementMotionSolver: additional hierarchy

- shm: have displacementMotionSolver as alternative mesh shrinker
  (instead of medialAxis).
- updated iglooWithFridges tutorial to use displacementLaplacian
- selectable interpolation from cells to points in the motion solvers
  using the 'interpolation' keyword:
    interpolation volPointInterpolation;    // default
    or
    interpolation patchCorrected (lowerWall upperWall);
- wrapped up mesh shrinkers (see above) for use as a displacementMotionSolver
  (i.e. the opposite of the displacementMotionSolver mesh shrinker)

src/fvMotionSolver/motionInterpolation/patchCorrected/patchCorrectedInterpolation.C

@@ -0,0 +1,124 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2015 OpenFOAM Foundation
+     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+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 "addToRunTimeSelectionTable.H"
+#include "patchCorrectedInterpolation.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+    defineTypeNameAndDebug(patchCorrectedInterpolation, 0);
+
+    addToRunTimeSelectionTable
+    (
+        motionInterpolation,
+        patchCorrectedInterpolation,
+        Istream
+    );
+}
+
+
+// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+
+Foam::labelListList Foam::patchCorrectedInterpolation::getPatchGroups
+(
+    Istream& entry
+) const
+{
+    List<List<word> > patchGroupNames(entry);
+
+    labelListList patchGroups(patchGroupNames.size());
+
+    forAll(patchGroupNames, patchI)
+    {
+        patchGroups[patchI].resize(patchGroupNames[patchI].size());
+
+        forAll(patchGroupNames[patchI], patchJ)
+        {
+            patchGroups[patchI][patchJ] =
+                mesh().boundaryMesh().findPatchID
+                (
+                    patchGroupNames[patchI][patchJ]
+                );
+
+            if (patchGroups[patchI][patchJ] == -1)
+            {
+                FatalErrorIn
+                (
+                    "Foam::patchCorrectedInterpolation::getPatchGroups"
+                    "(Istream&) const"
+                )   << "patch \"" << patchGroupNames[patchI][patchJ]
+                    << "\" not found" << exit(FatalError);
+            }
+        }
+    }
+
+    return patchGroups;
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::patchCorrectedInterpolation::patchCorrectedInterpolation
+(
+    const fvMesh& mesh,
+    Istream& entry
+)
+:
+    motionInterpolation(mesh, entry),
+    patchGroups_(getPatchGroups(entry))
+{}
+
+
+// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
+
+Foam::patchCorrectedInterpolation::~patchCorrectedInterpolation()
+{}
+
+
+// * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
+
+void Foam::patchCorrectedInterpolation::interpolate
+(
+    const volScalarField& cellDisplacement,
+    pointScalarField& pointDisplacement
+) const
+{
+    interpolateType(cellDisplacement, pointDisplacement);
+}
+
+
+void Foam::patchCorrectedInterpolation::interpolate
+(
+    const volVectorField& cellDisplacement,
+    pointVectorField& pointDisplacement
+) const
+{
+    interpolateType(cellDisplacement, pointDisplacement);
+}
+
+
+// ************************************************************************* //