[ghdlam]

Hello everyone,

Currently, I am doing simulations on FLUENT, for a natural and forced convection problem.

I would like to get the heat flux through the wall, so I estimated the two temperatures (T3 and T4) at the wall that separates the two environments in both sides than with Fourier's law I calculate the heat flux by conduction.

The simulations are in transient regime and the value of heat flow does not stabilize, it continues to increase, someone has an idea how the simulation converges?

more information
Rayleigh number of natural convection is about 10^10.
turbulence model standard k-e with enhanced wall treatment ( y+ about 1 respected) .
Reynolds number about 3x10^6 for the flow side.

studied problem.png
heat flux values.png
Thanks in advance.