comment

applications/utilities/mesh/manipulation/createPatch/createPatchDict

@@ -15,6 +15,28 @@ FoamFile
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+// This application/dictionary controls:
+// - optional: create new patches from boundary faces (either given as
+//   a set of patches or as a faceSet)
+// - always: order faces on coupled patches such that they are opposite. This
+//   is done for all coupled faces, not just for any patches created.
+// - optional: synchronise points on coupled patches.
+
+// 1. Create cyclic:
+// - specify where the faces should come from
+// - specify the type of cyclic. If a rotational specify the rotationAxis
+//   and centre to make matching easier
+// - pointSync true to guarantee points to line up.
+
+// 2. Correct incorrect cyclic:
+// This will usually fail upon loading:
+//  "face 0 area does not match neighbour 2 by 0.0100005%"
+//  " -- possible face ordering problem."
+// - change patch type from 'cyclic' to 'patch' in the polyMesh/boundary file.
+// - loosen match tolerance to get case to load
+// - regenerate cyclic as above
+
+
 // Tolerance used in matching faces. Absolute tolerance is span of
 // face times this factor. To load incorrectly matches meshes set this
 // to a higher value.