diff --git a/applications/test/GAMGAgglomeration/Make/files b/applications/test/GAMGAgglomeration/Make/files
new file mode 100644
index 0000000000..e6ad2af5d2
--- /dev/null
+++ b/applications/test/GAMGAgglomeration/Make/files
@@ -0,0 +1,3 @@
+Test-GAMGAgglomeration.C
+
+EXE = $(FOAM_USER_APPBIN)/Test-GAMGAgglomeration
diff --git a/applications/test/GAMGAgglomeration/Make/options b/applications/test/GAMGAgglomeration/Make/options
new file mode 100644
index 0000000000..d27c95d033
--- /dev/null
+++ b/applications/test/GAMGAgglomeration/Make/options
@@ -0,0 +1,7 @@
+EXE_INC = \
+    -I$(LIB_SRC)/finiteVolume/lnInclude \
+    -I$(LIB_SRC)/meshTools/lnInclude
+
+EXE_LIBS = \
+    -lfiniteVolume \
+    -lmeshTools
diff --git a/applications/test/GAMGAgglomeration/Test-GAMGAgglomeration.C b/applications/test/GAMGAgglomeration/Test-GAMGAgglomeration.C
new file mode 100644
index 0000000000..82ccd8ce33
--- /dev/null
+++ b/applications/test/GAMGAgglomeration/Test-GAMGAgglomeration.C
@@ -0,0 +1,201 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  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/>.
+
+Application
+    Test-GAMGAgglomeration
+
+Description
+    Test application for GAMG agglomeration. Hardcoded to expect GAMG on p.
+
+\*---------------------------------------------------------------------------*/
+
+#include "fvCFD.H"
+#include "GAMGAgglomeration.H"
+#include "OFstream.H"
+#include "meshTools.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+// Main program:
+
+int main(int argc, char *argv[])
+{
+    argList::addBoolOption
+    (
+        "writeObj",
+        "write obj files of agglomeration"
+    );
+    argList::addBoolOption
+    (
+        "normalise",
+        "normalise agglomeration (0..1)"
+    );
+
+    #include "setRootCase.H"
+    #include "createTime.H"
+
+    bool writeObj = args.optionFound("writeObj");
+    bool normalise = args.optionFound("normalise");
+
+    #include "createMesh.H"
+
+    const fvSolution& sol = static_cast<const fvSolution&>(mesh);
+    const dictionary& pDict = sol.subDict("solvers").subDict("p");
+
+    const GAMGAgglomeration& agglom = GAMGAgglomeration::New
+    (
+        mesh,
+        pDict
+    );
+
+    labelList cellToCoarse(identity(mesh.nCells()));
+    labelListList coarseToCell(invertOneToMany(mesh.nCells(), cellToCoarse));
+
+    runTime++;
+
+    // Write initial agglomeration
+    {
+        volScalarField scalarAgglomeration
+        (
+            IOobject
+            (
+                "agglomeration",
+                runTime.timeName(),
+                mesh,
+                IOobject::NO_READ,
+                IOobject::AUTO_WRITE
+            ),
+            mesh,
+            dimensionedScalar("aggomeration", dimless, 0.0)
+        );
+        scalarField& fld = scalarAgglomeration.internalField();
+        forAll(fld, cellI)
+        {
+            fld[cellI] = cellToCoarse[cellI];
+        }
+        fld /= max(fld);
+        scalarAgglomeration.correctBoundaryConditions();
+        scalarAgglomeration.write();
+
+        Info<< "Writing initial cell distribution to "
+            << runTime.timeName() << endl;
+    }
+
+
+    for (label level = 0; level < agglom.size(); level++)
+    {
+        runTime++;
+
+        Info<< "Time = " << runTime.timeName() << nl << endl;
+
+        const labelList& addr = agglom.restrictAddressing(level);
+        label coarseSize = max(addr)+1;
+
+        Info<< "Level : " << level << endl
+            << returnReduce(addr.size(), sumOp<label>()) << endl
+            << "    current size      : "
+            << returnReduce(addr.size(), sumOp<label>()) << endl
+            << "    agglomerated size : "
+            << returnReduce(coarseSize, sumOp<label>()) << endl;
+
+        forAll(addr, fineI)
+        {
+            const labelList& cellLabels = coarseToCell[fineI];
+            forAll(cellLabels, i)
+            {
+                cellToCoarse[cellLabels[i]] = addr[fineI];
+            }
+        }
+        coarseToCell = invertOneToMany(coarseSize, cellToCoarse);
+
+        // Write agglomeration
+        {
+            volScalarField scalarAgglomeration
+            (
+                IOobject
+                (
+                    "agglomeration",
+                    runTime.timeName(),
+                    mesh,
+                    IOobject::NO_READ,
+                    IOobject::AUTO_WRITE
+                ),
+                mesh,
+                dimensionedScalar("aggomeration", dimless, 0.0)
+            );
+            scalarField& fld = scalarAgglomeration.internalField();
+            forAll(fld, cellI)
+            {
+                fld[cellI] = cellToCoarse[cellI];
+            }
+            if (normalise)
+            {
+                fld /= max(fld);
+            }
+            scalarAgglomeration.correctBoundaryConditions();
+            scalarAgglomeration.write();
+        }
+
+        if (writeObj)
+        {
+            OFstream str(runTime.path()/runTime.timeName()/"aggomeration.obj");
+            label vertI = 0;
+
+            // Write all mesh cc
+            forAll(mesh.cellCentres(), cellI)
+            {
+                meshTools::writeOBJ(str, mesh.cellCentres()[cellI]);
+                vertI++;
+            }
+
+            // Determine coarse cc
+            forAll(coarseToCell, coarseI)
+            {
+                const labelList& cellLabels = coarseToCell[coarseI];
+
+                point coarseCc = average
+                (
+                    pointField(mesh.cellCentres(), cellLabels)
+                );
+                meshTools::writeOBJ(str, coarseCc);
+                vertI++;
+
+                forAll(cellLabels, i)
+                {
+                    label cellI = cellLabels[i];
+
+                    str << "l " << cellI+1 << ' ' << vertI << nl;
+                }
+            }
+        }
+
+        Info<< endl;
+    }
+
+
+    Info<< "End\n" << endl;
+
+    return 0;
+}
+
+
+// ************************************************************************* //
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/PairCollision/PairCollision.C b/src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/PairCollision/PairCollision.C
index 7851be5e70..4910faa51c 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/PairCollision/PairCollision.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/PairCollision/PairCollision.C
@@ -179,7 +179,7 @@ void Foam::PairCollision<CloudType>::wallInteraction()
 
     const labelListList& dil = il_.dil();
 
-    const labelListList directWallFaces = il_.dwfil();
+    const labelListList& directWallFaces = il_.dwfil();
 
     const labelList& patchID = mesh.boundaryMesh().patchID();
 
diff --git a/tutorials/incompressible/icoFoam/cavity/system/controlDict b/tutorials/incompressible/icoFoam/cavity/system/controlDict
index 8016db385c..d2fa09cc52 100644
--- a/tutorials/incompressible/icoFoam/cavity/system/controlDict
+++ b/tutorials/incompressible/icoFoam/cavity/system/controlDict
@@ -31,10 +31,6 @@ writeControl    timeStep;
 
 writeInterval   20;
 
-//- Additional dump every hour of cpuTime for e.g. restarts
-//secondaryWriteControl    cpuTime;
-//secondaryWriteInterval   3600;
-
 purgeWrite      0;
 
 writeFormat     ascii;