bc for closed tunnel

Hanni

Hello,

I hope you could help me. I am trying to run a simulation of closed wind tunnel with fan. I choosen fan as boundary condition and radiator for honeycomb and screen , turbulence modeling spalart allmaras with fine grid in the near wall. But the result much lower than real measurement from the real object.

Do you have any other suggestion for my problems. I might choose the wrong bc or there are things that I left ?

Thanks before