Overset AMG support. Final serial version

src/overset/oversetMesh/oversetAMGInterface/oversetAMGInterface.C

@@ -309,9 +309,11 @@ Foam::oversetAMGInterface::oversetAMGInterface
 
         // Get mesh owner-neighbour addressing to visit cells around fringe
         // faces
-        const unallocLabelList& own = lduMesh.lowerAddr();
+        const unallocLabelList& own =
+            fineOversetInterface_.ldu().lduAddr().lowerAddr();
 
-        const unallocLabelList& nei = lduMesh.upperAddr();
+        const unallocLabelList& nei =
+            fineOversetInterface_.ldu().lduAddr().upperAddr();
 
         const labelList& fringeFaces =
             fineOversetInterface_.overset().fringeFaces();
@@ -798,6 +800,13 @@ Foam::label Foam::oversetAMGInterface::interfaceSize() const
     return interfaceSize_;
 }
 
+
+const Foam::lduMesh& Foam::oversetAMGInterface::ldu() const
+{
+    return AMGInterface::ldu();
+}
+
+
 const Foam::oversetMesh& Foam::oversetAMGInterface::overset() const
 {
     // Overset should not be accessed from coarse levels

src/overset/oversetMesh/oversetAMGInterface/oversetAMGInterface.H

@@ -170,6 +170,9 @@ public:
 
         // Interface transfer functions
 
+            //- Return lduMesh for owner-neighbour addressing
+            virtual const lduMesh& ldu() const;
+
             //- Return access to overset mesh.
             //  Available only on the finest level
             virtual const oversetMesh& overset() const;

src/overset/oversetMesh/oversetFvPatch/oversetFvPatch.C

@@ -93,6 +93,12 @@ Foam::label Foam::oversetFvPatch::interfaceSize() const
 }
 
 
+const Foam::lduMesh& Foam::oversetFvPatch::ldu() const
+{
+    return boundaryMesh().mesh();
+}
+
+
 const Foam::labelList& Foam::oversetFvPatch::acceptorCells() const
 {
     return overset().acceptorCells();

src/overset/oversetMesh/oversetFvPatch/oversetFvPatch.H

@@ -126,6 +126,9 @@ public:
             //  of internal field
             virtual label interfaceSize() const;
 
+            //- Return lduMesh for owner-neighbour addressing
+            virtual const lduMesh& ldu() const;
+
             //- Return acceptor cells
             virtual const labelList& acceptorCells() const;
 

src/overset/oversetMesh/oversetLduInterface/oversetLduInterface.H

@@ -47,6 +47,7 @@ namespace Foam
 {
 
 // Forward declaration of classes
+class lduMesh;
 class oversetMesh;
 class mapDistribute;
 
@@ -86,6 +87,9 @@ public:
         //  due to different comms pattern
         virtual label interfaceSize() const = 0;
 
+        //- Return lduMesh for owner-neighbour addressing
+        virtual const lduMesh& ldu() const = 0;
+
         //- Return oversetMesh for fine-level addressing
         virtual const oversetMesh& overset() const = 0;