Reply To: Transient Porous Media Combustion

[Foo Sin Khai]

Hi there,
Got issue again here and really need your help... Issue: Before turn on Discrete Ordinate Radiation model, my solution can converge. (1e-6 continuity, second order-scheme.) 

Setup Before Turning On Discrete Ordinate:
Steady
Realizable k-epsilon
Species Transport
For natural convection to cool down the wall this setting is set: air density properties-incompressible gas law, gravity is turn on, operating density =1.225...
Boundary condition for coolant(air) inlet: pressure-inlet 
Convergence criteria: Continuity = 1e-6 
Second order scheme
Result:


Now, i try to turn on Discrete Ordinate and run with first order scheme it cannot converge. Any idea why this happen?