From eeefdf75529fcb826b2d508b94811969ed776b8c Mon Sep 17 00:00:00 2001
From: Hrvoje Jasak <h.jasak@wikki.co.uk>
Date: Thu, 28 Mar 2019 15:49:47 +0000
Subject: [PATCH] Comment on IB patch normal

---
 .../immersedBoundaryFvPatch/immersedBoundaryFvPatch.H        | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/immersedBoundary/immersedBoundary/immersedBoundaryFvPatch/immersedBoundaryFvPatch.H b/src/immersedBoundary/immersedBoundary/immersedBoundaryFvPatch/immersedBoundaryFvPatch.H
index 99f1bc8f1..1f2cadb39 100644
--- a/src/immersedBoundary/immersedBoundary/immersedBoundaryFvPatch/immersedBoundaryFvPatch.H
+++ b/src/immersedBoundary/immersedBoundary/immersedBoundaryFvPatch/immersedBoundaryFvPatch.H
@@ -176,9 +176,12 @@ public:
         // Access functions for geometrical data
 
             //- Return face normals
+            //  Note: n is calculated from the intersected primitive patch,
+            //  while Sf is fixed by Marooney Maneouvre.
+            //  They may not be parallel.  Reconsider
+            //  HJ, 28/Mar/2019
             virtual tmp<vectorField> nf() const;
 
-
             //- Return cell-centre to face-centre vector
             virtual tmp<vectorField> delta() const;