Radiation modelling

Jagan

I'm trying to model radiation heat transfer of heat sink along with natural convection since the temperature difference is high. So there is a fluid medium (air) surrounding heat sink (aluminum). Please device what radiation model is supposed to be used. Thank you.

acupro

If you're not concerned about participating any participating medium (P1 or DiscreteOrdinates), enclosure would be fine, and maybe the most accurate.

If you're not concerned about surface-to-surface radiation, just radiation to a far reference temperature, you could just add the Radiation boundary condition - with the value set to sigma*T_ref^4.