The picture that I attached is showing a pump which I am trying to find the flow velocity near blade surfaces. I added a cylindirical area around impeller and applied rotating frame. For the first trial my BC's are

1) Inlet Flow Rate;

2) Outlet Environment Pressure;

3) Real Wall to Impeller;     

4) Real Wall as Stator to Water touching faces inside the pump.

As a second study I deleted the rotating frame and applied these boundaries;

1) Inlet Flow Rate;

2) Outlet Environment Pressure;

3) Real Wall as Wall Motion to Impeller's Water touching faces.

Which one do you think is the best and the most logical way to do that kind of study?