[hguvenc]

Hi everybody,

I want to ask that when the calculate blade rotation with steady state moving referance frame method, every body gives a velocity to inlet include guides. But I want to do that a fan which rotates in the still-air and has a nozzle around the blade.

I give the boundary conditions velocity inlet '0' m/s, pressure outlet atmosphere. All surrounding defined by symmetry.

I do some simulations, when the blade was alone, the region is circular around the blade (image 2), just reversed flow on the outlet. But when the nozzle comes I choose the rotating region inside the nozzle and the result seems to wrong.(image 3,4)

I search a little bit how it is done correctly and a little bit confused, how can I define the inlet velocity and what is need to be rotating region?