what kind of mesh operations for curved surface

hi
how can i refine mesh for curved surfaces... i have seen hfss mesh operations but i cannt make any sense of the m , i mean how can i explot them .. is dere can kind of guide lines for setting the different paramets like λ based refinement , aspect ration etc .... any kind of help would be highly acknowledged.
thanx in advance
Rohit Bahl

can the expert users of HFSS kindly guide me?
many thanx
Rohit Bahl