From 6e33ee25f0c151fef467ecf3287c9cc3c11cce26 Mon Sep 17 00:00:00 2001
From: Vuko Vukcevic <v.vukcevic@wikki.co.uk>
Date: Fri, 12 Jan 2018 15:59:06 +0100
Subject: [PATCH] Switching on/off polyhedral refinement engine

---
 .../dynamicPolyRefinementFvMesh.C               | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/dynamicPolyRefinementFvMesh.C b/src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/dynamicPolyRefinementFvMesh.C
index d6c319c2d..9eee3187e 100644
--- a/src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/dynamicPolyRefinementFvMesh.C
+++ b/src/dynamicMesh/topoChangerFvMesh/dynamicPolyRefinementFvMesh/dynamicPolyRefinementFvMesh.C
@@ -134,7 +134,8 @@ bool dynamicPolyRefinementFvMesh::update()
         polyhedralRefinement& polyRefModifier =
             refCast<polyhedralRefinement>(topoChanger_[0]);
 
-        // Get refinement candidates from refinement selection algorithm
+        // Get refinement candidates from refinement selection algorithm. Note:
+        // return type is Xfer<labelList> so there's no copying
         const labelList refCandidates
         (
             refinementSelectionPtr_->refinementCellCandidates()
@@ -144,7 +145,8 @@ bool dynamicPolyRefinementFvMesh::update()
         // point consistent refinement is performed
         polyRefModifier.setCellsToRefine(refCandidates);
 
-        // Get unrefinement point candidates from refinement selection algorithm
+        // Get unrefinement point candidates from refinement selection
+        // algorithm. Note: return type is Xfer<labelList> so there's no copying
         const labelList unrefCandidates
         (
             refinementSelectionPtr_->unrefinementPointCandidates()
@@ -155,6 +157,17 @@ bool dynamicPolyRefinementFvMesh::update()
         // unrefinement
         polyRefModifier.setSplitPointsToUnrefine(unrefCandidates);
 
+        // Activate the polyhedral refinement engine if there are some cells to
+        // refine or there are some split points to unrefine around
+        if (!refCandidates.empty() || !unrefCandidates.empty())
+        {
+            polyRefModifier.enable();
+        }
+        else
+        {
+            polyRefModifier.disable();
+        }
+
         // Perform refinement and unrefinement in one go
         autoPtr<mapPolyMesh> topoChangeMap = topoChanger_.changeMesh();