diff --git a/src/finiteVolume/functionObjects/volRegion/volRegion.C b/src/finiteVolume/functionObjects/volRegion/volRegion.C
index c39c9cf8c5..ceb7cdb801 100644
--- a/src/finiteVolume/functionObjects/volRegion/volRegion.C
+++ b/src/finiteVolume/functionObjects/volRegion/volRegion.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -51,6 +51,67 @@ Foam::functionObjects::volRegion::regionTypeNames_
 });
 
 
+// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+
+void Foam::functionObjects::volRegion::calculateCache()
+{
+    regionID_ = -1;
+    cellIds_.clear();
+
+    switch (regionType_)
+    {
+        case vrtAll:
+        {
+            nCells_ = volMesh_.globalData().nTotalCells();
+            V_ = gSum(volMesh_.V());
+            return;
+            break;
+        }
+
+        case vrtCellSet:
+        {
+            cellIds_ = cellSet(volMesh_, regionName_).sortedToc();
+            break;
+        }
+
+        case vrtCellZone:
+        {
+            regionID_ = volMesh_.cellZones().findZoneID(regionName_);
+
+            if (regionID_ < 0)
+            {
+                FatalErrorInFunction
+                    << "Unknown cell zone name: " << regionName_
+                    << ". Valid cell zones    : "
+                    << flatOutput(volMesh_.cellZones().names())
+                    << exit(FatalError);
+            }
+            break;
+        }
+    }
+
+    // Cached value for nCells()
+    nCells_ = returnReduce(cellIDs().size(), sumOp<label>());
+
+    // Cached value for V()
+    V_ = 0;
+    for (const label celli : cellIDs())
+    {
+        V_ += volMesh_.V()[celli];
+    }
+    reduce(V_, sumOp<scalar>());
+
+    if (!nCells_)
+    {
+        FatalErrorInFunction
+            << regionTypeNames_[regionType_]
+            << "(" << regionName_ << "):" << nl
+            << "    Region has no cells"
+            << exit(FatalError);
+    }
+}
+
+
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
 void Foam::functionObjects::volRegion::writeFileHeader
@@ -76,6 +137,9 @@ Foam::functionObjects::volRegion::volRegion
 )
 :
     volMesh_(mesh),
+    cellIds_(),
+    nCells_(0),
+    V_(Zero),
     regionType_
     (
         regionTypeNames_.lookupOrDefault
@@ -89,10 +153,6 @@ Foam::functionObjects::volRegion::volRegion
     regionID_(-1)
 {
     read(dict);
-
-    // Cache integral properties of the region for writeFileHeader
-    nCells_ = nCells();
-    V_ = V();
 }
 
 
@@ -103,59 +163,18 @@ bool Foam::functionObjects::volRegion::read
     const dictionary& dict
 )
 {
-    regionID_ = -1;
-    cellIds_.clear();
-
     switch (regionType_)
     {
-        case vrtCellSet:
+        case vrtAll:
         {
-            dict.readEntry("name", regionName_);
-
-            cellIds_ = cellSet(volMesh_, regionName_).sortedToc();
-
-            if (nCells() == 0)
-            {
-                FatalIOErrorInFunction(dict)
-                    << regionTypeNames_[regionType_]
-                    << "(" << regionName_ << "):" << nl
-                    << "    Region has no cells"
-                    << exit(FatalIOError);
-            }
-
+            regionName_ = volMesh_.name();
             break;
         }
 
+        case vrtCellSet:
         case vrtCellZone:
         {
             dict.readEntry("name", regionName_);
-
-            regionID_ = volMesh_.cellZones().findZoneID(regionName_);
-
-            if (regionID_ < 0)
-            {
-                FatalIOErrorInFunction(dict)
-                    << "Unknown cell zone name: " << regionName_
-                    << ". Valid cell zones    : "
-                    << flatOutput(volMesh_.cellZones().names())
-                    << exit(FatalIOError);
-            }
-
-            if (nCells() == 0)
-            {
-                FatalIOErrorInFunction(dict)
-                    << regionTypeNames_[regionType_]
-                    << "(" << regionName_ << "):" << nl
-                    << "    Region has no cells"
-                    << exit(FatalIOError);
-            }
-
-            break;
-        }
-
-        case vrtAll:
-        {
-            regionName_= volMesh_.name();
             break;
         }
 
@@ -165,9 +184,11 @@ bool Foam::functionObjects::volRegion::read
                 << "Unknown region type. Valid region types are:"
                 << flatOutput(regionTypeNames_.names()) << nl
                 << exit(FatalIOError);
+            break;
         }
     }
 
+    calculateCache();
     return true;
 }
 
@@ -192,35 +213,15 @@ const Foam::labelList& Foam::functionObjects::volRegion::cellIDs() const
 }
 
 
-Foam::label Foam::functionObjects::volRegion::nCells() const
+void Foam::functionObjects::volRegion::updateMesh(const mapPolyMesh&)
 {
-    if (regionType_ == vrtAll)
-    {
-        return volMesh_.globalData().nTotalCells();
-    }
-    else
-    {
-        return returnReduce(cellIDs().size(), sumOp<label>());
-    }
+    calculateCache();
 }
 
 
-Foam::scalar Foam::functionObjects::volRegion::V() const
+void Foam::functionObjects::volRegion::movePoints(const polyMesh&)
 {
-    if (regionType_ == vrtAll)
-    {
-        return gSum(volMesh_.V());
-    }
-    else
-    {
-        scalar vol = 0;
-        for (const label celli : cellIDs())
-        {
-            vol += volMesh_.V()[celli];
-        }
-
-        return returnReduce(vol, sumOp<scalar>());
-    }
+    calculateCache();
 }
 
 
diff --git a/src/finiteVolume/functionObjects/volRegion/volRegion.H b/src/finiteVolume/functionObjects/volRegion/volRegion.H
index ef33682b94..7702368c2f 100644
--- a/src/finiteVolume/functionObjects/volRegion/volRegion.H
+++ b/src/finiteVolume/functionObjects/volRegion/volRegion.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -80,6 +80,8 @@ namespace Foam
 
 // Forward declarations
 class fvMesh;
+class polyMesh;
+class mapPolyMesh;
 
 namespace functionObjects
 {
@@ -97,12 +99,19 @@ class volRegion
         //- The cell ids, from cellSet
         labelList cellIds_;
 
-        // Cache integral properties of the region for writeFileHeader
+        //- Cached total number of cells selected
         label nCells_;
 
+        //- Cached total selection volume
         scalar V_;
 
 
+    // Private Member Functions
+
+        //- Update cellIds, nCells, volume
+        void calculateCache();
+
+
 public:
 
     // Public data types
@@ -155,10 +164,7 @@ public:
     virtual ~volRegion() = default;
 
 
-    // Public Member Functions
-
-        //- Read from dictionary
-        bool read(const dictionary& dict);
+    // Member Functions
 
         //- Return the region type
         inline const regionTypes& regionType() const;
@@ -167,10 +173,20 @@ public:
         const labelList& cellIDs() const;
 
         //- Return the number of cells selected in the region
-        label nCells() const;
+        inline label nCells() const;
 
-        //- Return total volume of the region
-        scalar V() const;
+        //- Return total volume of the selected region
+        inline scalar V() const;
+
+
+        //- Read from dictionary
+        virtual bool read(const dictionary& dict);
+
+        //- Update for changes of mesh
+        virtual void updateMesh(const mapPolyMesh&);
+
+        //- Update for mesh point-motion
+        virtual void movePoints(const polyMesh&);
 };
 
 
diff --git a/src/finiteVolume/functionObjects/volRegion/volRegionI.H b/src/finiteVolume/functionObjects/volRegion/volRegionI.H
index 8362453941..b2a810a725 100644
--- a/src/finiteVolume/functionObjects/volRegion/volRegionI.H
+++ b/src/finiteVolume/functionObjects/volRegion/volRegionI.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -31,4 +31,17 @@ Foam::functionObjects::volRegion::regionType() const
     return regionType_;
 }
 
+
+inline Foam::label Foam::functionObjects::volRegion::nCells() const
+{
+    return nCells_;
+}
+
+
+inline Foam::scalar Foam::functionObjects::volRegion::V() const
+{
+    return V_;
+}
+
+
 // ************************************************************************* //