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radiation DTRM vs. S2S comparison

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Old   February 12, 2017, 08:54
Default radiation DTRM vs. S2S comparison
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saimen
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Dear CFD community,

I am simulating radiation heat transfer between two concentric cylinders filled with air and came up with the following problem:

When I simulate heat transfer between the cylinders using S2S radiation I get different results as when I use DTRM with absorption coefficient 0. In my opinion these two models should deliver the same results...

In my case we can assume an optical thin medium, therefore S2S radiation would fit well for the problem. I am a bit confused because DTRM more or less should do the same as S2S radiation for absorption coefficient 0.

Does anyone have an explanation?

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saimen
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Old   February 14, 2017, 04:34
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Hello all

I found the solution. Fluent does not like to have absorption coefficients that are 0. When i use e.g. 10e-5, then the DTRM shows similar behaviour as S2S.

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