Added clearing out existing map; added reverse distribution

src/OpenFOAM/meshes/polyMesh/mapPolyMesh/mapDistribute/mapDistribute.C

@@ -288,6 +288,7 @@ Foam::mapDistribute::mapDistribute
 
         forAll(compactMap, procI)
         {
+            compactMap[procI].clear();
             if (procI != Pstream::myProcNo())
             {
                 compactMap[procI].resize(2*nNonLocal[procI]);
@@ -433,6 +434,7 @@ Foam::mapDistribute::mapDistribute
 
         forAll(compactMap, procI)
         {
+            compactMap[procI].clear();
             if (procI != Pstream::myProcNo())
             {
                 compactMap[procI].resize(2*nNonLocal[procI]);

src/OpenFOAM/meshes/polyMesh/mapPolyMesh/mapDistribute/mapDistribute.H

@@ -276,6 +276,49 @@ public:
                 }
             }
 
+            //- Reverse distribute data using default commsType.
+            template<class T>
+            void reverseDistribute(const label constructSize, List<T>& fld)
+            const
+            {
+                if (Pstream::defaultCommsType == Pstream::nonBlocking)
+                {
+                    distribute
+                    (
+                        Pstream::nonBlocking,
+                        List<labelPair>(),
+                        constructSize,
+                        constructMap_,
+                        subMap_,
+                        fld
+                    );
+                }
+                else if (Pstream::defaultCommsType == Pstream::scheduled)
+                {
+                    distribute
+                    (
+                        Pstream::scheduled,
+                        schedule(),
+                        constructSize,
+                        constructMap_,
+                        subMap_,
+                        fld
+                    );
+                }
+                else
+                {
+                    distribute
+                    (
+                        Pstream::blocking,
+                        List<labelPair>(),
+                        constructSize,
+                        constructMap_,
+                        subMap_,
+                        fld
+                    );
+                }
+            }
+
             //- Correct for topo change.
             void updateMesh(const mapPolyMesh&)
             {

src/OpenFOAM/meshes/polyMesh/mapPolyMesh/mapDistribute/mapDistributeTemplates.C

@@ -552,7 +552,6 @@ void Foam::mapDistribute::distribute
     {
         if (!contiguous<T>())
         {
-//XXXXXX
             PstreamBuffers pBuffs(Pstream::nonBlocking);
 
             // Stream data into buffer