diff --git a/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.C b/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.C
index 264a8620d..c8cf5195a 100644
--- a/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.C
+++ b/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.C
@@ -27,33 +27,63 @@ License
 #include "fvBoundaryMesh.H"
 
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-namespace Foam
-{
-
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void fvBoundaryMesh::addFvPatches()
+void Foam::fvBoundaryMesh::addFvPatches()
 {
     const polyBoundaryMesh& bMesh = mesh_.boundaryMesh();
-    
+
+    // Clear existing patches and resize the list
+    clear();
     setSize(bMesh.size());
 
     // Set boundary patches, using the patches added to the polyMesh
     // Bug fix.  HJ, 1/Mar/2018
     fvPatchList& Patches = *this;
 
-    forAll(Patches, patchI)
+    forAll (Patches, patchI)
     {
         Patches.set(patchI, fvPatch::New(bMesh[patchI], *this));
     }
 }
 
 
+void Foam::fvBoundaryMesh::resetFvPatches(const boolList& resetFvPatchFlag)
+{
+    const polyBoundaryMesh& bMesh = mesh_.boundaryMesh();
+
+    if (resetFvPatchFlag.size() != bMesh.size())
+    {
+        FatalErrorIn("void resetFvPatches(const boolList& resetFvPatchFlag)")
+            << "Incorrect size of reset list.  Boundary size: "
+            << bMesh.size() << " reset size: " << resetFvPatchFlag.size()
+            << abort(FatalError);
+    }
+
+    // Reset list size.  This will delete pointers to patches
+    // if the list is truncated
+    setSize(bMesh.size());
+
+    // Set boundary patches, using the patches added to the polyMesh
+    // Bug fix.  HJ, 1/Mar/2018
+    fvPatchList& Patches = *this;
+
+    // In order to preserve patch links on resize of boundary,
+    // only reset the empty slots
+    forAll (Patches, patchI)
+    {
+        if (resetFvPatchFlag[patchI])
+        {
+            // Set new patch.  This also deletes old pointer
+            Patches.set(patchI, fvPatch::New(bMesh[patchI], *this));
+        }
+    }
+}
+
+
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-fvBoundaryMesh::fvBoundaryMesh
+Foam::fvBoundaryMesh::fvBoundaryMesh
 (
     const fvMesh& m
 )
@@ -67,7 +97,7 @@ fvBoundaryMesh::fvBoundaryMesh
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void fvBoundaryMesh::movePoints()
+void Foam::fvBoundaryMesh::movePoints()
 {
     forAll(*this, patchi)
     {
@@ -81,7 +111,7 @@ void fvBoundaryMesh::movePoints()
 }
 
 
-lduInterfacePtrsList fvBoundaryMesh::interfaces() const
+Foam::lduInterfacePtrsList Foam::fvBoundaryMesh::interfaces() const
 {
     lduInterfacePtrsList interfaces(size());
 
@@ -101,15 +131,11 @@ lduInterfacePtrsList fvBoundaryMesh::interfaces() const
 }
 
 
-void fvBoundaryMesh::readUpdate()
+void Foam::fvBoundaryMesh::readUpdate()
 {
     clear();
     addFvPatches();
 }
 
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-} // End namespace Foam
-
 // ************************************************************************* //
diff --git a/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.H b/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.H
index e9e5d55f4..e6a420db3 100644
--- a/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.H
+++ b/src/finiteVolume/fvMesh/fvBoundaryMesh/fvBoundaryMesh.H
@@ -73,6 +73,11 @@ private:
         //- Add fvPatches corresponding to the polyBoundaryMesh
         void addFvPatches();
 
+        //- Reset fvPatches corresponding to the polyBoundaryMesh
+        //  When the mesh is resized, the existing patches may be preserved
+        //  or reset depending on the resetFlag
+        void resetFvPatches(const boolList& resetFvPatchFlag);
+
 
 protected:
 
diff --git a/src/finiteVolume/fvMesh/fvMesh.C b/src/finiteVolume/fvMesh/fvMesh.C
index f5b87e4b1..713cfc919 100644
--- a/src/finiteVolume/fvMesh/fvMesh.C
+++ b/src/finiteVolume/fvMesh/fvMesh.C
@@ -392,13 +392,49 @@ void Foam::fvMesh::removeFvBoundary()
 
     // Remove fvBoundaryMesh data first.
     boundary_.clear();
-    boundary_.setSize(0);
     polyMesh::removeBoundary();
 
     clearOut();
 }
 
 
+void Foam::fvMesh::resetFvPrimitives
+(
+    const Xfer<pointField>& points,
+    const Xfer<faceList>& faces,
+    const Xfer<labelList>& owner,
+    const Xfer<labelList>& neighbour,
+    const labelList& patchSizes,
+    const labelList& patchStarts,
+    const boolList& resetFvPatchFlag,
+    const bool validBoundary
+)
+{
+    // Reset polyMesh primitives
+    polyMesh::resetPrimitives
+    (
+        points,
+        faces,
+        owner,
+        neighbour,
+        patchSizes,
+        patchStarts,
+        validBoundary
+    );
+
+    boundary_.resetFvPatches(resetFvPatchFlag);
+    surfaceInterpolation::clearOut();
+    clearGeomNotOldVol();
+
+    // Reset fvPatches?  HJ, 16/Apr/2018
+
+    // Clear LDU
+    clearAddressing();
+
+    // Clear cell volumes?
+}        
+
+
 Foam::polyMesh::readUpdateState Foam::fvMesh::readUpdate()
 {
     if (debug)
diff --git a/src/finiteVolume/fvMesh/fvMesh.H b/src/finiteVolume/fvMesh/fvMesh.H
index 22f973efc..90d23af20 100644
--- a/src/finiteVolume/fvMesh/fvMesh.H
+++ b/src/finiteVolume/fvMesh/fvMesh.H
@@ -360,6 +360,25 @@ public:
             //  these fvPatches.
             void removeFvBoundary();
 
+            //- Reset mesh primitive data. Assumes all patch info correct
+            //  (so does e.g. parallel communication). If not, use
+            //  validBoundary = false
+            //  (still assumes patchStarts[0] = nInternalFaces and last
+            //  patch ends at nActiveFaces) and change patches with addPatches.
+            //  resetFvPatchFlag indicates which fvPatches will be rebuilt
+            //  if the flag is set to false, original patch is preserved
+            void resetFvPrimitives
+            (
+                const Xfer<pointField>& points,
+                const Xfer<faceList>& faces,
+                const Xfer<labelList>& owner,
+                const Xfer<labelList>& neighbour,
+                const labelList& patchSizes,
+                const labelList& patchStarts,
+                const boolList& resetFvPatchFlag,
+                const bool validBoundary = true
+            );
+
             //- Return cell face motion fluxes
             surfaceScalarField& setPhi();
 
diff --git a/src/finiteVolume/fvMesh/fvMeshGeometry.C b/src/finiteVolume/fvMesh/fvMeshGeometry.C
index e5286a3fb..6f83ec2ee 100644
--- a/src/finiteVolume/fvMesh/fvMeshGeometry.C
+++ b/src/finiteVolume/fvMesh/fvMeshGeometry.C
@@ -155,7 +155,8 @@ void fvMesh::makeC() const
         *this,
         dimLength,
         cellCentres(),
-        faceCentres()
+        faceCentres(),
+        false             // Do not preserve couples in geometry fields
     );
 
     // This piece of code is necessary for cyclic and cyclicGgi interfaces
@@ -231,7 +232,8 @@ void fvMesh::makeCf() const
         ),
         *this,
         dimLength,
-        faceCentres()
+        faceCentres(),
+        false             // Do not preserve couples in geometry fields
     );
 
     // Boundary update.  Used in complex geometries, eg. immersed boundary
diff --git a/src/finiteVolume/fvMesh/fvPatches/fvPatch/fvPatch.C b/src/finiteVolume/fvMesh/fvPatches/fvPatch/fvPatch.C
index 4fd439f4e..fc99a18f6 100644
--- a/src/finiteVolume/fvMesh/fvPatches/fvPatch/fvPatch.C
+++ b/src/finiteVolume/fvMesh/fvPatches/fvPatch/fvPatch.C
@@ -146,7 +146,8 @@ tmp<vectorField> fvPatch::Cn() const
     // Get reference to global cell centres
     // Bugfix: access cell centres from fvMesh data, not polyMesh.
     // HJ, 30/Nov/2017
-    const vectorField& gcc = boundaryMesh().mesh().C().internalField();
+    // const vectorField& gcc = boundaryMesh().mesh().C().internalField();
+    const vectorField& gcc = boundaryMesh().mesh().cellCentres();
 
     forAll (faceCells, faceI)
     {