ENH: Updated windSimpleFoam turbineSiting tutorial field sources

tutorials/incompressible/windSimpleFoam/turbineSiting/constant/sourcesProperties

@@ -23,10 +23,10 @@ disk1
     duration        1000.0;        //duration
     selectionMode   cellSet;       //cellSet // points //cellZone
     cellSet         actuationDisk1;//cellSet name when selectionMode = cellSet
-    cellZone        actuationDisk1;//cellZone name when selectionMode = cellZone
 
     actuationDiskSourceCoeffs
     {
+        fieldName   U;
         diskDir     (-1 0 0); // orientation of the disk
         Cp          0.53;     // Cp
         Ct          0.58;     // Ct
@@ -42,14 +42,15 @@ disk2
     duration        1000.0;
     selectionMode   cellSet;
     cellSet         actuationDisk2;
-    cellZone        actuationDisk2;
 
     actuationDiskSourceCoeffs
     {
+        fieldName   U;
         diskDir     (-1 0 0);
         Cp          0.53;
         Ct          0.58;
         diskArea    40;
     }
 }
+
 // ************************************************************************* //