[Edilson_Ferreira]

I am new in the CFD field and in the Ansys fluent.
I am trying to model a stirred mixing tank with a laminar model. I want to apply the Rotating Reference Frame (RRF) in the walls of the tank, but when I try to select, it select all superfice of the volume. I want to select just the walls in contact with the tank and apply a angular velocity to then. I see a lot of tutorials in the internet, but I don't see this specific answerd.
I ask for some help. A little tip, maybe. I can send the files if is needed.