Forced Convection issue
 

Hi all,
I'm new to Ansys and I've been trying to model a simple forced convection problem but I've been having issues with no heat being produced. It's simply a solid block where one of the surfaces should produce a heat. I've given said surface a constant heat flux while the remaining surfaces have been assumed adiabatic.

Gravity is on in the y-direction (-9.81), SST k-omega, the density of air is modeled as incompressible-ideal-gas, what am I doing wrong?