postProcess.H: clear the object owned by the mesh objectRegistry

at the end of each time processed to ensure all fields are updated for each
time.

Resolves bug-report https://bugs.openfoam.org/view.php?id=2997

src/OpenFOAM/db/functionObjects/functionObjectList/postProcess.H

@@ -155,6 +155,9 @@ if (argList::postProcess(argc, argv))
             Warning<< err << endl;
         }
 
+        // Clear the objects owned by the mesh
+        mesh.objectRegistry::clear();
+
         Info<< endl;
     }
 

src/OpenFOAM/db/objectRegistry/objectRegistry.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -92,21 +92,7 @@ Foam::objectRegistry::objectRegistry
 
 Foam::objectRegistry::~objectRegistry()
 {
-    List<regIOobject*> myObjects(size());
+    clear();
-    label nMyObjects = 0;
-
-    for (iterator iter = begin(); iter != end(); ++iter)
-    {
-        if (iter()->ownedByRegistry())
-        {
-            myObjects[nMyObjects++] = iter();
-        }
-    }
-
-    for (label i=0; i < nMyObjects; i++)
-    {
-        checkOut(*myObjects[i]);
-    }
 }
 
 
@@ -284,6 +270,26 @@ bool Foam::objectRegistry::checkOut(regIOobject& io) const
 }
 
 
+void Foam::objectRegistry::clear()
+{
+    List<regIOobject*> myObjects(size());
+    label nMyObjects = 0;
+
+    for (iterator iter = begin(); iter != end(); ++iter)
+    {
+        if (iter()->ownedByRegistry())
+        {
+            myObjects[nMyObjects++] = iter();
+        }
+    }
+
+    for (label i=0; i < nMyObjects; i++)
+    {
+        checkOut(*myObjects[i]);
+    }
+}
+
+
 void Foam::objectRegistry::rename(const word& newName)
 {
     regIOobject::rename(newName);

src/OpenFOAM/db/objectRegistry/objectRegistry.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -199,6 +199,10 @@ public:
             //- Remove an regIOobject from registry
             bool checkOut(regIOobject&) const;
 
+            //- Remove all regIOobject owned by the registry
+            void clear();
+
+
         // Reading
 
             //- Return true if any of the object's files have been modified