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DO Model giving wrong results for optically thick media ? |
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January 7, 2011, 09:58 |
DO Model giving wrong results for optically thick media ?
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#1 |
New Member
Salvatore Cunsolo
Join Date: Jan 2011
Posts: 2
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First of all, hello everyone as this is my first post here !
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 ? |
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January 11, 2011, 16:39 |
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#2 |
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Salvatore Cunsolo
Join Date: Jan 2011
Posts: 2
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Upping the thread. Maybe someone has an idea.
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January 21, 2011, 13:45 |
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#3 |
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Nikolopoulos Aristeidis
Join Date: Jan 2011
Location: Athens, Greece
Posts: 62
Rep Power: 15 |
Which version of fluent are you using?
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April 16, 2013, 22:27 |
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#4 | |
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gefei
Join Date: Apr 2013
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