Hi, just quickly adding some notes:
Anything inside a rotating zone will be rotating - you can verify this by plotting velocities on the post-processor and analyzing the velocities on the walls. In short, if you leave walls inside a rotating zone with “No-slip”, they will already be rotating (as Fillia mentioned).
The second case, where we have a wall that should not rotate but is inside the rotating zone requires caution. Only in this case it’s necessary to define a rotating wall boundary condition with zero angular velocity, otherwise the portion of the wall inside the rotating zone will rotate.
This procedure is covered in section 2.2.3. from the water turbine tutorial:
To answer your question: at the moment it’s necessary to define the walls as rotating walls for the subsonic analysis. There will be a patch soon, to apply this condition automatically, so it works exactly like in the OpenFOAM solvers.
Hope this helps.