[ahlo7]

Hello,

I am simulating a jet fan in a tunnel.
The fan is set in a simple way: a cylinder with one end as entrance of the jet fan and another end as exit of the jet fan.
A tunnel air domain was cut by this fan cylinder and set the entrance of jet fan as an outlet and the exit of the jet fan as an inlet of the domain.
Two ends of the tunnel were set as openings with static pressure zero Pa.
The jet fan has 26m/s velocity with area 1.16m^2
The tunnel section is 45m^2 and 300m length.

The simulation went well and converged well, but the result looks not realistic.
The tunnel average velocity is 20m/s! It needs a huge power to drive this flow. The jet fan obviously has a small portion of such a power. Where it was wrong...?

Turbulence model used is k-e with 5% intensity

Thanks for any help

Ahlo