ENH: distributedTriSurfaceMesh: work with flipped shells. Fixes #2405

Two problems:
- flipping inside snappyHexMesh is not done in a parallel
consistent way. So e.g. the octree-cached inside/outside information
has already been calculated. For now flipping of
distributedTriSurfaceMesh is disabled.
- octree-cached inside/outside information was using already
cached information and would only work for outwards pointing
volumes

tutorials/mesh/snappyHexMesh/distributedTriSurfaceMesh/Allrun

@@ -42,12 +42,23 @@ runApplication -s 9 surfaceRefineRedGreen \
 runApplication -s 10 surfaceRefineRedGreen \
     constant/triSurface/box_12_9.obj constant/triSurface/box.obj
 
-
+#- Offset to create second surface
 runApplication surfaceTransformPoints \
     -rotate '((1 0 0)(1 0.8 0.9))' \
     -translate '(0.1 0.101 0.103)' \
     constant/triSurface/box.obj constant/triSurface/box_trans.obj
 
+#- Invert surface (so inwards pointing normals) to use as refinement box
+runApplication surfaceOrient -inside  \
+    constant/triSurface/box.obj \
+    '(100 100 100)'             \
+    constant/triSurface/box_flipped.obj
+
+runApplication -s scale surfaceTransformPoints \
+    -translate '(0.2 0.3 0.3)' \
+    -write-scale '(0.5)' \
+    constant/triSurface/box_flipped.obj constant/triSurface/box_scaled.obj
+
 
 runApplication snappyHexMesh
 

tutorials/mesh/snappyHexMesh/distributedTriSurfaceMesh/system/snappyHexMeshDict

@@ -38,6 +38,11 @@ geometry
         file "box_trans.obj";
         type distributedTriSurfaceMesh;
     }
+    shell
+    {
+        file "box_scaled.obj";
+        type distributedTriSurfaceMesh;
+    }
 };
 
 
@@ -129,6 +134,12 @@ castellatedMeshControls
 
     refinementRegions
     {
+        shell
+        {
+            // Refine a volume
+            mode    outside;
+            levels  ((1.0 6));
+        }
     }