From d28a72f14c9edba6fe77990c9dee6d7692725a57 Mon Sep 17 00:00:00 2001
From: Henry Weller <http://cfd.direct>
Date: Wed, 17 Jun 2015 20:20:49 +0100
Subject: [PATCH] rhoCentralFoam: Updated Courant number calculation to be
 cell-based rather than face-based Now consistent with the way the Courant
 number is calculated for other solvers

---
 .../compressible/rhoCentralFoam/centralCourantNo.H     | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/applications/solvers/compressible/rhoCentralFoam/centralCourantNo.H b/applications/solvers/compressible/rhoCentralFoam/centralCourantNo.H
index 09c13ff24..d915d29ac 100644
--- a/applications/solvers/compressible/rhoCentralFoam/centralCourantNo.H
+++ b/applications/solvers/compressible/rhoCentralFoam/centralCourantNo.H
@@ -31,16 +31,12 @@ Description
 
 if (mesh.nInternalFaces())
 {
-    surfaceScalarField amaxSfbyDelta
-    (
-        mesh.surfaceInterpolation::deltaCoeffs()*amaxSf
-    );
+    scalarField sumAmaxSf(fvc::surfaceSum(amaxSf)().internalField());
 
-    CoNum = max(amaxSfbyDelta/mesh.magSf()).value()*runTime.deltaTValue();
+    CoNum = 0.5*gMax(sumAmaxSf/mesh.V().field())*runTime.deltaTValue();
 
     meanCoNum =
-        (sum(amaxSfbyDelta)/sum(mesh.magSf())).value()
-       *runTime.deltaTValue();
+        0.5*(gSum(sumAmaxSf)/gSum(mesh.V().field()))*runTime.deltaTValue();
 }
 
 Info<< "Mean and max Courant Numbers = "