[fifi]

Hi!
I need to model a heat exchange between electronic devices represented by a cuboid and an air in tunnel. The air comes in to the inlet with velocity 15m/s and it flows around the electronic devices package. I would like to simulate a heat exchange to get knowledge about increase of air temperature/decrease of package temperature. Package temperature equals 50 C degree.
I already have got a geometry and a mesh. I have tried many things, but always nothing happens with temperatures in tunnel, only really slight changes.

How to model cooling devices package and whole this situation?

Greetings