Usually you just move the fluid and then compute the drag so you know the thrust you need. You could then run a rotating frame problem for the rotor to see what thrust you are getting. If you are using the fan model then the thrust will be a function of the change of momentum as the fuid passes thruogh the fan. You can figure it out by a hand calc.

Usually you just move the fluid and then compute the drag so you know the thrust you need. You could then run a rotating frame problem for the rotor to see what thrust you are getting. If you are using the fan model then the thrust will be a function of the change of momentum as the fuid passes thruogh the fan. You can figure it out by a hand calc.