Improve reference handling.

src/finiteVolume/cfdTools/general/findRefCell/findRefCell.C

@@ -34,7 +34,7 @@ void Foam::setRefCell
     const dictionary& dict,
     label& refCelli,
     scalar& refValue,
-    bool forceReference
+    const bool forceReference
 )
 {
     if (field.needReference() || forceReference)
@@ -119,4 +119,15 @@ void Foam::setRefCell
 }
 
 
+Foam::scalar Foam::getRefCellValue
+(
+    const volScalarField& field,
+    const label refCelli
+)
+{
+    scalar refCellValue = (refCelli >= 0 ? field[refCelli] : 0.0);
+    return returnReduce<label>(refCellValue, sumOp<scalar>());
+}
+
+
 // ************************************************************************* //

src/finiteVolume/cfdTools/general/findRefCell/findRefCell.H

@@ -49,11 +49,18 @@ namespace Foam
 //  but which is not on a cyclic, symmetry or processor patch.
 void setRefCell
 (
-    const volScalarField&,
-    const dictionary&,
-    label& refCellI,
+    const volScalarField& field,
+    const dictionary& dict,
+    label& refCelli,
     scalar& refValue,
-    bool forceReference = false
+    const bool forceReference = false
+);
+
+//- Return the current value of field in the reference cell
+scalar getRefCellValue
+(
+    const volScalarField& field,
+    const label refCelli
 );
 
 }

src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.C

@@ -472,22 +472,18 @@ void Foam::fvMatrix<Type>::setValues
 }
 
 
-// Set reference level for solution
 template<class Type>
 void Foam::fvMatrix<Type>::setReference
 (
-    const label cell,
+    const label celli,
     const Type& value,
     const bool forceReference
 )
 {
-    if (psi_.needReference() || forceReference)
+    if (celli >= 0 && (psi_.needReference() || forceReference))
     {
-        if (cell >= 0)
-        {
-            source()[cell] += diag()[cell]*value;
-            diag()[cell] += diag()[cell];
-        }
+        source()[celli] += diag()[celli]*value;
+        diag()[celli] += diag()[celli];
     }
 }
 

src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.H

@@ -326,7 +326,7 @@ public:
             //- Set reference level for solution
             void setReference
             (
-                const label cell,
+                const label celli,
                 const Type& value,
                 const bool forceReference = false
             );