CFD simulation of an Air conditioned 3D rectangle
 

Hello guys,

Im in need of help with my transient analysis simulation of an air conditioned airflow inside a closed 3D rectangle. MY expected result is to see the gradual steady temperature change as time increases, just like a bus when the air conditioner is on. The main details can be seen in the photo attached. Also the initial temperature at 0seconds is set to 35C

The simulation doesn't run when i use the air material as IDEAL GAS but it works when it is set as AIR AT 25C but the result is somewhat wrong.

Please can someone help me out with this?, i will provide ,more details if needed:confused.

I really need some help!!