The tutorials in this set illustrate two different methods of modeling fluid flow systems containing moving parts. Both tutorials describe simulations of the same rotating fan case, but the first one uses Moving Reference Frames to do so whilst the second one uses Rigid Body Motion.
The problem involves an idealized fan assembly whose axis and 12 equally-spaced blades are rotating at 2,000 r.p.m. while the external body remains stationary. Air enters through the inlet, shown in red below, at 5 m/s and exits through a pressure boundary, shown in orange.
Note that it is necessary to complete the Moving Reference Frames Tutorial first since the Rigid Body Motion Tutorial restarts from it.