Surface-to-Surface Radiation HT Simulation

Amod Kumar

Dear CFX users,

What is the ideal way to Simulate only surface-to-surface HT simulation wihout solving the Convection?

I am trying to benchmark simulated result with theoretically exact calculation for a cube (100 x 100 x 100) mm^3. The two opposite faces are at uniform temperatures 300 [K] and 400 [K]. Remaining 4 walls are black and refractory (re-radiating).

The air was used as dummy fluid (ideal gas at very low pressure 0.1 [bar]) with all 3 components of velocity = 0, thermal conductivity very very low (~ 0.000026 [W/m-K] to prevent any HT to the fluid.

Unfortunately, the run is no way directed towards convergence!!

Any insight would be highly appreciated!

Thanks,

Amod