DO Model giving wrong results for optically thick media ?
First of all, hello everyone as this is my first post here ! :D
Now, the problem.
I set up a very simple case, 2 walls at set temperature separated by a fluid. No gravity. No scattering.
Then i tried solving it:
- Without radiation
- With Rosseland radiation model.
- With P-1 radiation model.
- With DO radiation model.
Well, while Rosseland and P-1 results are consistent across a range of temperatures and absorption coefficient, I noticed that the wall fluxes calculated with the DO model are always higher than those calculated with Rosseland or P-1.
At this point i set the absorption coefficient at an extremely high value (10^9) and, while the Rosseland and P-1 models give me the predictable result (i.e. radiation heat transfer become negligible), the DO model still gives very high values of radiation heat transfer.
Any ideas ?
Upping the thread. Maybe someone has an idea. :D
Which version of fluent are you using?
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