GeometricField::dimensionedInteralFieldRef() -> GeometricField::ref()

In order to simplify expressions involving dimensioned internal field it
is preferable to use a simpler access convention.  Given that
GeometricField is derived from DimensionedField it is simply a matter of
de-referencing this underlying type unlike the boundary field which is
peripheral information.  For consistency with the new convention in
"tmp"  "dimensionedInteralFieldRef()" has been renamed "ref()".

src/postProcessing/functionObjects/utilities/CourantNo/CourantNo.C

@@ -142,10 +142,10 @@ void Foam::CourantNo::execute()
                 mesh.lookupObject<volScalarField>(type())
             );
 
-        Co.dimensionedInternalFieldRef() = byRho
+        Co.ref() = byRho
         (
             (0.5*mesh.time().deltaT())
-           *fvc::surfaceSum(mag(phi))().dimensionedInternalField()
+           *fvc::surfaceSum(mag(phi))()()
            /mesh.V()
         );
         Co.correctBoundaryConditions();