diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C b/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
index ac8734c944..1d0f6c3beb 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C
@@ -189,9 +189,8 @@ int main(int argc, char *argv[])
         "(tet pyr prism hex poly)."
     );
 
-    // the volume field types that we handle
-    const label nVolFieldTypes = 10;
-    const word volFieldTypes[] =
+    // The volume field types that we handle
+    const wordList volFieldTypes
     {
         volScalarField::typeName,
         volVectorField::typeName,
@@ -363,7 +362,7 @@ int main(int argc, char *argv[])
         // ~~~~~~~~~~~~~~~~~~~~~~
         Info<< "Write volume field (";
 
-        for (label typei=0; typei < nVolFieldTypes; ++typei)
+        forAll(volFieldTypes, typei)
         {
             const word& fieldType = volFieldTypes[typei];
             wordList fieldNames = objects.names(fieldType);
diff --git a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
index c890d2993b..ab2e67e855 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToEnsightParts/foamToEnsightParts.C
@@ -139,18 +139,22 @@ int main(int argc, char *argv[])
     );
 
     // The volume field types that we handle
-    wordHashSet volFieldTypes;
-    volFieldTypes.insert(volScalarField::typeName);
-    volFieldTypes.insert(volVectorField::typeName);
-    volFieldTypes.insert(volSphericalTensorField::typeName);
-    volFieldTypes.insert(volSymmTensorField::typeName);
-    volFieldTypes.insert(volTensorField::typeName);
+    const wordHashSet volFieldTypes
+    {
+        volScalarField::typeName,
+        volVectorField::typeName,
+        volSphericalTensorField::typeName,
+        volSymmTensorField::typeName,
+        volTensorField::typeName
+    };
 
     // The lagrangian field types that we handle
-    wordHashSet cloudFieldTypes;
-    cloudFieldTypes.insert(scalarIOField::typeName);
-    cloudFieldTypes.insert(vectorIOField::typeName);
-    cloudFieldTypes.insert(tensorIOField::typeName);
+    const wordHashSet cloudFieldTypes
+    {
+        scalarIOField::typeName,
+        vectorIOField::typeName,
+        tensorIOField::typeName
+    };
 
     #include "setRootCase.H"
 
diff --git a/src/fileFormats/ensight/file/ensightCase.C b/src/fileFormats/ensight/file/ensightCase.C
index 0ac968e799..dc803f5f99 100644
--- a/src/fileFormats/ensight/file/ensightCase.C
+++ b/src/fileFormats/ensight/file/ensightCase.C
@@ -58,14 +58,17 @@ void Foam::ensightCase::initialize()
         // eg, convert new results or a particular time interva
         // OR remove everything
 
-        if (options_->overwrite())
+        if (isDir(ensightDir_))
         {
-            rmDir(ensightDir_);
-        }
-        else if (isDir(ensightDir_))
-        {
-            Info<<"Warning: re-using existing directory" << nl
-                << "    " << ensightDir_ << endl;
+            if (options_->overwrite())
+            {
+                Foam::rmDir(ensightDir_);
+            }
+            else
+            {
+                Info<<"Warning: re-using existing directory" << nl
+                    << "    " << ensightDir_ << endl;
+            }
         }
 
         // Create ensight and data directories
diff --git a/src/fileFormats/ensight/part/ensightCells.C b/src/fileFormats/ensight/part/ensightCells.C
index ea12323d5c..5e17013314 100644
--- a/src/fileFormats/ensight/part/ensightCells.C
+++ b/src/fileFormats/ensight/part/ensightCells.C
@@ -65,7 +65,7 @@ inline Foam::label Foam::ensightCells::offset
 }
 
 
-void Foam::ensightCells::allocate()
+void Foam::ensightCells::resize()
 {
     // overall required size
     label n = 0;
@@ -97,13 +97,39 @@ Foam::ensightCells::ensightCells(const label partIndex)
     sizes_(0),
     lists_()
 {
-    // ensure sub-lists are properly initialized to nullptr
+    // Ensure sub-lists are properly initialized to nullptr
     forAll(lists_, typeI)
     {
         lists_[typeI] = nullptr;
     }
 
-    clear();
+    resize();   // adjust allocation
+}
+
+
+Foam::ensightCells::ensightCells(const ensightCells& obj)
+:
+    index_(obj.index_),
+    address_(obj.address_),
+    sizes_(0),
+    lists_()
+{
+    // Ensure sub-lists are properly initialized to nullptr
+    forAll(lists_, typeI)
+    {
+        lists_[typeI] = nullptr;
+    }
+
+    // Total (reduced) sizes
+    FixedList<label, 5> totSizes = obj.sizes_;
+
+    // Local sizes
+    this->sizes_ = obj.sizes();
+
+    resize();   // adjust allocation
+
+    // Restore total (reduced) sizes
+    this->sizes_ = totSizes;
 }
 
 
@@ -111,7 +137,12 @@ Foam::ensightCells::ensightCells(const label partIndex)
 
 Foam::ensightCells::~ensightCells()
 {
-    clear();
+    sizes_ = 0;
+    forAll(lists_, typeI)
+    {
+        deleteDemandDrivenData(lists_[typeI]);
+    }
+    address_.clear();
 }
 
 
@@ -143,12 +174,7 @@ Foam::label Foam::ensightCells::total() const
 void Foam::ensightCells::clear()
 {
     sizes_ = 0;
-
-    forAll(lists_, typeI)
-    {
-        deleteDemandDrivenData(lists_[typeI]);
-    }
-    address_.clear();
+    resize();
 }
 
 
@@ -156,7 +182,7 @@ void Foam::ensightCells::reduce()
 {
     forAll(sizes_, typeI)
     {
-        sizes_[typeI] = lists_[typeI] ? lists_[typeI]->size() : 0;
+        sizes_[typeI] = lists_[typeI]->size();
         Foam::reduce(sizes_[typeI], sumOp<label>());
     }
 }
@@ -221,8 +247,8 @@ void Foam::ensightCells::classify
         sizes_[what]++;
     }
 
-    allocate();
-    sizes_ = 0;   // reset sizes
+    resize();   // adjust allocation
+    sizes_ = 0; // reset sizes
 
     // Assign cell-id per shape type
     for (label listI = 0; listI < sz; ++listI)
diff --git a/src/fileFormats/ensight/part/ensightCells.H b/src/fileFormats/ensight/part/ensightCells.H
index 4c9d034b0d..a84de2ce9c 100644
--- a/src/fileFormats/ensight/part/ensightCells.H
+++ b/src/fileFormats/ensight/part/ensightCells.H
@@ -82,7 +82,8 @@ private:
 
     // Private data
 
-        //- Location within a list
+        //- Location within a list.
+        //  The ensight part number is typically this value +1.
         label index_;
 
         //- Linear list of ids, sub-sectioned per element type via SubLists
@@ -92,6 +93,7 @@ private:
         FixedList<label, 5> sizes_;
 
         //- List of ids for each element type
+        //  Managed via pointers, since a SubList cannot be relocated/resized.
         FixedList<SubList<label>*, 5> lists_;
 
 
@@ -101,12 +103,11 @@ private:
         inline label offset(const enum elemType what, const label i) const;
 
         //- Use current sizes to redimension the element lists
-        void allocate();
+        void resize();
 
         //- Disallow default bitwise assignment
         void operator=(const ensightCells&) = delete;
 
-        // Retain default copy constructor (needed for lists etc).
 
 public:
 
@@ -115,6 +116,9 @@ public:
         //- Construct null, optionally with index
         ensightCells(label partIndex = 0);
 
+        //- Copy constructor. Needed for lists etc.
+        ensightCells(const ensightCells&);
+
 
     //- Destructor
     ~ensightCells();
@@ -171,7 +175,7 @@ public:
         );
 
 
-        //- Set sizes to zero, free up memory
+        //- Set addressable sizes to zero, free up addressing memory.
         void clear();
 
         //- Sum element counts across all processes.
diff --git a/src/fileFormats/ensight/part/ensightCellsI.H b/src/fileFormats/ensight/part/ensightCellsI.H
index 35879f3a40..88e0168322 100644
--- a/src/fileFormats/ensight/part/ensightCellsI.H
+++ b/src/fileFormats/ensight/part/ensightCellsI.H
@@ -23,6 +23,8 @@ License
 
 \*---------------------------------------------------------------------------*/
 
+#include "error.H"
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 inline const char* Foam::ensightCells::key(const enum elemType what)
@@ -66,6 +68,14 @@ inline const Foam::labelUList& Foam::ensightCells::cellIds
     const enum elemType what
 ) const
 {
+    if (!lists_[what])
+    {
+        FatalErrorInFunction
+            << "Accessing unallocated sublist for elem-type: "
+            << elemEnum[what]
+            << exit(FatalError);
+    }
+
     return *(lists_[what]);
 }
 
diff --git a/src/fileFormats/ensight/part/ensightFaces.C b/src/fileFormats/ensight/part/ensightFaces.C
index ffcc7dcfc4..d20e585ae4 100644
--- a/src/fileFormats/ensight/part/ensightFaces.C
+++ b/src/fileFormats/ensight/part/ensightFaces.C
@@ -101,7 +101,7 @@ inline Foam::label Foam::ensightFaces::offset
 }
 
 
-void Foam::ensightFaces::allocate()
+void Foam::ensightFaces::resize()
 {
     // overall required size
     label n = 0;
@@ -137,13 +137,40 @@ Foam::ensightFaces::ensightFaces(label partIndex)
     sizes_(0),
     lists_()
 {
-    // ensure sub-lists are properly initialized to nullptr
+    // Ensure sub-lists are properly initialized to nullptr
     forAll(lists_, typeI)
     {
         lists_[typeI] = nullptr;
     }
 
-    clear();
+    resize();   // adjust allocation
+}
+
+
+Foam::ensightFaces::ensightFaces(const ensightFaces& obj)
+:
+    index_(obj.index_),
+    address_(obj.address_),
+    flipMap_(obj.flipMap_),
+    sizes_(0),
+    lists_()
+{
+    // Ensure sub-lists are properly initialized to nullptr
+    forAll(lists_, typeI)
+    {
+        lists_[typeI] = nullptr;
+    }
+
+    // Total (reduced) sizes
+    FixedList<label, 3> totSizes = obj.sizes_;
+
+    // Local sizes
+    this->sizes_ = obj.sizes();
+
+    resize();   // adjust allocation
+
+    // Restore total (reduced) sizes
+    this->sizes_ = totSizes;
 }
 
 
@@ -151,7 +178,13 @@ Foam::ensightFaces::ensightFaces(label partIndex)
 
 Foam::ensightFaces::~ensightFaces()
 {
-    clear();
+    sizes_ = 0;
+    forAll(lists_, typeI)
+    {
+        deleteDemandDrivenData(lists_[typeI]);
+    }
+    address_.clear();
+    flipMap_.clear();
 }
 
 
@@ -162,7 +195,7 @@ Foam::FixedList<Foam::label, 3> Foam::ensightFaces::sizes() const
     FixedList<label, 3> count;
     forAll(lists_, typeI)
     {
-        count[typeI] = lists_[typeI] ? lists_[typeI]->size() : 0;
+        count[typeI] = lists_[typeI]->size();
     }
 
     return count;
@@ -183,13 +216,7 @@ Foam::label Foam::ensightFaces::total() const
 void Foam::ensightFaces::clear()
 {
     sizes_ = 0;
-
-    forAll(lists_, typeI)
-    {
-        deleteDemandDrivenData(lists_[typeI]);
-    }
-    address_.clear();
-    flipMap_.clear();
+    resize();
 }
 
 
@@ -197,7 +224,7 @@ void Foam::ensightFaces::reduce()
 {
     forAll(sizes_, typeI)
     {
-        sizes_[typeI] = lists_[typeI] ? lists_[typeI]->size() : 0;
+        sizes_[typeI] = lists_[typeI]->size();
         Foam::reduce(sizes_[typeI], sumOp<label>());
     }
 }
@@ -265,7 +292,7 @@ void Foam::ensightFaces::classify(const faceList& faces)
         sizes_[what]++;
     }
 
-    allocate(); // adjust allocation
+    resize();   // adjust allocation
     sizes_ = 0; // reset sizes
 
     // Assign face-id per shape type
@@ -305,7 +332,7 @@ void Foam::ensightFaces::classify
         }
     }
 
-    allocate(); // adjust allocation
+    resize();   // adjust allocation
     sizes_ = 0; // reset sizes
 
     if (useFlip)
diff --git a/src/fileFormats/ensight/part/ensightFaces.H b/src/fileFormats/ensight/part/ensightFaces.H
index 693ff029eb..dfb16859c0 100644
--- a/src/fileFormats/ensight/part/ensightFaces.H
+++ b/src/fileFormats/ensight/part/ensightFaces.H
@@ -74,11 +74,13 @@ public:
         //- Return the ensight element name for the specified type
         static inline const char* key(const enum elemType);
 
+
 private:
 
     // Private data
 
-        //- Location in list
+        //- Location within a list.
+        //  The ensight part number is typically this value +1.
         label index_;
 
         //- Linear list of ids, sub-sectioned per element type via SubLists
@@ -90,7 +92,8 @@ private:
         //- List of global sizes for each element type
         FixedList<label, 3> sizes_;
 
-        //- SubLists of ids for each element type
+        //- SubLists of ids for each element type.
+        //  Managed via pointers, since a SubList cannot be relocated/resized.
         FixedList<SubList<label>*, 3> lists_;
 
 
@@ -106,12 +109,11 @@ private:
         inline label offset(const enum elemType what, const label i) const;
 
         //- Use current sizes to redimension the element lists
-        void allocate();
+        void resize();
 
         //- Disallow default bitwise assignment
         void operator=(const ensightFaces&) = delete;
 
-        // Retain default copy constructor. Needed for lists etc.
 
 public:
 
@@ -120,6 +122,9 @@ public:
         //- Construct null, optionally with index
         ensightFaces(label partIndex = 0);
 
+        //- Copy constructor. Needed for lists etc.
+        ensightFaces(const ensightFaces&);
+
 
     //- Destructor
     ~ensightFaces();
@@ -189,7 +194,7 @@ public:
         );
 
 
-        //- Set sizes to zero, free up memory
+        //- Set addressable sizes to zero, free up addressing memory.
         void clear();
 
         //- Sum element counts across all processes.
diff --git a/src/fileFormats/ensight/part/ensightFacesI.H b/src/fileFormats/ensight/part/ensightFacesI.H
index bfc2bcd650..4b32a373db 100644
--- a/src/fileFormats/ensight/part/ensightFacesI.H
+++ b/src/fileFormats/ensight/part/ensightFacesI.H
@@ -23,6 +23,8 @@ License
 
 \*---------------------------------------------------------------------------*/
 
+#include "error.H"
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 inline const char* Foam::ensightFaces::key(const enum elemType what)
@@ -66,6 +68,14 @@ inline const Foam::labelUList& Foam::ensightFaces::faceIds
     const enum elemType what
 ) const
 {
+    if (!lists_[what])
+    {
+        FatalErrorInFunction
+            << "Accessing unallocated sublist for elem-type: "
+            << elemEnum[what]
+            << exit(FatalError);
+    }
+
     return *(lists_[what]);
 }