Added get_ndof to the builder

Author: friedenhe

dafoam/mphys/mphys_dafoam.py

@@ -137,6 +137,10 @@ def get_number_of_nodes(self, groupName=None):
                         nodes += 1 + parameters["nNodes"]
         return nodes
 
+    def get_ndof(self):
+        # The number of degrees of freedom used at each output location.
+        return -1
+
 
 class DAFoamGroup(Group):
     """