Input boundary condition is getting manipulated
 

Hi all, I am simulating flow in a 3D duct with heat transfer. I have used velocity inlet as inlet boundary condition, pressure outlet as outlet boundary condition and other faces with wall with some of them having heat flux input. My solution is getting converged.

But the problem is my inlet boundary condition (temperature) is getting manipulated of its own and outlet temperature is very low. I am not understanding why my inlet boundary condition is getting manipulated. Any solution from anyone?

Thanks in advance.

With regards

Sharad