BUG: cellCellStencil: use before mesh.update. Fixes #1028.

src/overset/cellCellStencil/cellCellStencil/cellCellStencilObject.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -55,12 +55,7 @@ typedef MeshObject
 
 class cellCellStencilObject
 :
-    public MeshObject
-    <
-        fvMesh,
-        MoveableMeshObject,
-        cellCellStencilObject
-    >,
+    public Stencil,
     public cellCellStencil
 {
     // Private data

src/overset/dynamicOversetFvMesh/dynamicOversetFvMesh.C

@@ -44,6 +44,15 @@ namespace Foam
 bool Foam::dynamicOversetFvMesh::updateAddressing() const
 {
     const cellCellStencilObject& overlap = Stencil::New(*this);
+    // Make sure that stencil is not still in the initial, non-uptodate
+    // state. This gets triggered by e.g. Poisson wall distance that
+    // triggers the stencil even though time has not been updated (and hence
+    // mesh.update() has not been called.
+    if (!stencilIsUpToDate_)
+    {
+        stencilIsUpToDate_ = true;
+        const_cast<cellCellStencilObject&>(overlap).update();
+    }
 
     // The (processor-local part of the) stencil determines the local
     // faces to add to the matrix. tbd: parallel
@@ -227,6 +236,7 @@ Foam::dynamicOversetFvMesh::dynamicOversetFvMesh(const IOobject& io)
 {
     // Load stencil (but do not update)
     (void)Stencil::New(*this, false);
+    stencilIsUpToDate_ = false;
 }
 
 

src/overset/dynamicOversetFvMesh/dynamicOversetFvMesh.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2015-2017 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2015-2018 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -65,6 +65,8 @@ protected:
         //  lduAddressing (true)
         mutable bool active_;
 
+        mutable bool stencilIsUpToDate_;
+
         //- Extended addressing (extended with local interpolation stencils)
         mutable autoPtr<fvMeshPrimitiveLduAddressing> lduPtr_;