fvcDdt: added ddt functions with "one" arguments

src/finiteVolume/finiteVolume/fvc/fvcDdt.C

@@ -102,6 +102,30 @@ ddt
 }
 
 
+template<class Type>
+tmp<GeometricField<Type, fvPatchField, volMesh> >
+ddt
+(
+    const one&,
+    const GeometricField<Type, fvPatchField, volMesh>& vf
+)
+{
+    return ddt(vf);
+}
+
+
+template<class Type>
+tmp<GeometricField<Type, fvPatchField, volMesh> >
+ddt
+(
+    const GeometricField<Type, fvPatchField, volMesh>& vf,
+    const one&
+)
+{
+    return ddt(vf);
+}
+
+
 template<class Type>
 tmp<GeometricField<typename flux<Type>::type, fvsPatchField, surfaceMesh> >
 ddtPhiCorr

src/finiteVolume/finiteVolume/fvc/fvcDdt.H

@@ -39,6 +39,7 @@ SourceFiles
 #include "volFieldsFwd.H"
 #include "surfaceFieldsFwd.H"
 #include "dimensionedTypes.H"
+#include "geometricZeroField.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -78,6 +79,29 @@ namespace fvc
         const GeometricField<Type, fvPatchField, volMesh>&
     );
 
+    template<class Type>
+    tmp<GeometricField<Type, fvPatchField, volMesh> > ddt
+    (
+        const one&,
+        const GeometricField<Type, fvPatchField, volMesh>&
+    );
+
+    template<class Type>
+    tmp<GeometricField<Type, fvPatchField, volMesh> > ddt
+    (
+        const GeometricField<Type, fvPatchField, volMesh>&,
+        const one&
+    );
+
+    inline geometricZeroField ddt
+    (
+        const one&,
+        const one&
+    )
+    {
+        return geometricZeroField();
+    }
+
     template<class Type>
     tmp
     <