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UDF for a constant heat flux minus radiation based on face temperature |
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March 10, 2015, 00:08 |
UDF for a constant heat flux minus radiation based on face temperature
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#1 |
New Member
Mario Arias
Join Date: Mar 2015
Posts: 6
Rep Power: 11 |
I am trying to write a UDF which takes a total constant heat flux boundary condition, but also accounts for the radiative loses. I would like it to use the local face temperature to determine the net heat flux that should be applied at that node face.
If this is possible I would greatly appreciate some information. Or if there is a better way of accounting for surface-to-ambient radiative loses, I would gladly take that advice. Thanks, Mario |
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March 10, 2015, 09:14 |
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#2 |
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
Rep Power: 23 |
If I am not wrong, there are no macros for obtaining radiation related information on node, cell or face. You may have to manually process data exported from Export-->Solution Data option.
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March 10, 2015, 10:21 |
What about using temperature?
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#3 |
New Member
Mario Arias
Join Date: Mar 2015
Posts: 6
Rep Power: 11 |
Thanks for you reply.
I understand there is no radiation information, but couldn't I simply use the following equation in the UDF: There must be a simple way to calculate the effects of surface-to-ambient radiation when applying a heat flux, it is such a basic concept. I must be missing something. Thanks again, Mario Arias |
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March 10, 2015, 16:54 |
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#4 |
Senior Member
Join Date: Mar 2015
Posts: 892
Rep Power: 18 |
You could use your own calculation for radiation losses inside a custom boundary condition using a DEFINE_PROFILE macro. Loop through the faces using begin_f_loop and end_f_loop. The face temperature could be found with F_T(f,t) and the ambient temperature could either be found in another cell zone (if you are simulating the surrounding environment) or hard coded.
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heat flux, radiation, udf |
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