ENH: regionSplit: allow local region counting

src/meshTools/regionSplit/regionSplit.C

@@ -379,6 +379,7 @@ Foam::label Foam::regionSplit::calcLocalRegionSplit
 
 Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
 (
+    const bool doGlobalRegions,
     const boolList& blockedFace,
     const List<labelPair>& explicitConnections,
 
@@ -395,7 +396,7 @@ Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
         cellRegion
     );
 
-    if (!Pstream::parRun())
+    if (!doGlobalRegions)
     {
         return autoPtr<globalIndex>(new globalIndex(nLocalRegions));
     }
@@ -422,7 +423,7 @@ Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
     // (this will create gaps in the global region list so they will get
     // merged later on)
 
-    while (Pstream::parRun())
+    while (true)
     {
         if (debug)
         {
@@ -690,13 +691,14 @@ Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::regionSplit::regionSplit(const polyMesh& mesh)
+Foam::regionSplit::regionSplit(const polyMesh& mesh, const bool doGlobalRegions)
 :
     MeshObject<polyMesh, Foam::TopologicalMeshObject, regionSplit>(mesh),
     labelList(mesh.nCells(), -1)
 {
     globalNumberingPtr_ = calcRegionSplit
     (
+        doGlobalRegions,    //do global regions
         boolList(0, false), //blockedFaces
         List<labelPair>(0), //explicitConnections,
         *this
@@ -707,7 +709,8 @@ Foam::regionSplit::regionSplit(const polyMesh& mesh)
 Foam::regionSplit::regionSplit
 (
     const polyMesh& mesh,
-    const boolList& blockedFace
+    const boolList& blockedFace,
+    const bool doGlobalRegions
 )
 :
     MeshObject<polyMesh, Foam::TopologicalMeshObject, regionSplit>(mesh),
@@ -715,6 +718,7 @@ Foam::regionSplit::regionSplit
 {
     globalNumberingPtr_ = calcRegionSplit
     (
+        doGlobalRegions,
         blockedFace,        //blockedFaces
         List<labelPair>(0), //explicitConnections,
         *this
@@ -726,7 +730,8 @@ Foam::regionSplit::regionSplit
 (
     const polyMesh& mesh,
     const boolList& blockedFace,
-    const List<labelPair>& explicitConnections
+    const List<labelPair>& explicitConnections,
+    const bool doGlobalRegions
 )
 :
     MeshObject<polyMesh, Foam::TopologicalMeshObject, regionSplit>(mesh),
@@ -734,6 +739,7 @@ Foam::regionSplit::regionSplit
 {
     globalNumberingPtr_ = calcRegionSplit
     (
+        doGlobalRegions,
         blockedFace,            //blockedFaces
         explicitConnections,    //explicitConnections,
         *this

src/meshTools/regionSplit/regionSplit.H

@@ -87,6 +87,9 @@ Description
       proc0 | proc1 | proc2
 
 
+    Can optionally keep all regions local to the processor.
+
+
 SourceFiles
     regionSplit.C
 
@@ -155,6 +158,7 @@ class regionSplit
         //- Calculate global region split. Return globalIndex.
         autoPtr<globalIndex> calcRegionSplit
         (
+            const bool doGlobalRegions,
             const boolList& blockedFace,
             const List<labelPair>& explicitConnections,
             labelList& cellRegion
@@ -170,11 +174,20 @@ public:
     // Constructors
 
         //- Construct from mesh
-        regionSplit(const polyMesh&);
+        regionSplit
+        (
+            const polyMesh&,
+            const bool doGlobalRegions = Pstream::parRun()
+        );
 
         //- Construct from mesh and whether face is blocked
         //  NOTE: blockedFace has to be consistent across coupled faces!
-        regionSplit(const polyMesh&, const boolList& blockedFace);
+        regionSplit
+        (
+            const polyMesh&,
+            const boolList& blockedFace,
+            const bool doGlobalRegions = Pstream::parRun()
+        );
 
         //- Construct from mesh and whether face is blocked. Additional explicit
         //  connections between normal boundary faces.
@@ -183,7 +196,8 @@ public:
         (
             const polyMesh&,
             const boolList& blockedFace,
-            const List<labelPair>&
+            const List<labelPair>&,
+            const bool doGlobalRegions = Pstream::parRun()
         );
 
 
@@ -195,6 +209,12 @@ public:
             return globalNumberingPtr_();
         }
 
+        //- Return local number of regions
+        label nLocalRegions() const
+        {
+            return globalNumbering().localSize(Pstream::myProcNo());
+        }
+
         //- Return total number of regions
         label nRegions() const
         {