[svantevid]

I'm trying to prepare the centrifugal fan simulation to observe the flow parameters in the stator (diffuser) part. I have the measurements that were made for the fan unit (box with a pressure sensor inside, unit sits on the opening on top of the box, inlet is on the side of the box with a specific diameter, outlet of the fan unit is into the surrounding air) for the pressure drop inside the box, assflow through the unit and the rotational frequency of the fan. I'm using Fluent.



The recommended setup is the MRF model with a stationary inlet and outlet parts and a rotational part of the domain that encloses the impeller of the fan. For BCs I tried different approach; (1) massflow at the outlet with pressure inlet (0 Pa gauge pressure - ambient pressure), (2) pressure inlet and outlet - both ambient pressures....

The only BC setup that seems to make sense is the (2) case, but the pressures at the outlet from the unit were too low, I suppose this was the result of the pressure outlet BC being too close to the actual unit outlet. When I made the outlet domain bigger, the simulation didn't diverge.

Is there a better approach than the ones described above?