Time-mean Nusselt Number

nenazarian · October 27, 2012, 18:50

Dear All,

Im looking for a suggestion on how to do this in the best way:

I would like to calculate time-mean Nusselt number but I do not trust pre-defined Nu# in fluent. ( I am solving radiation as well as convection and the value for total heat transfer coefficient accounts for both)

I would like to calculate Nusselt number from temperature gradient and I know there is a UDF for that purpose.
However, how would it be possible to calculate the time-mean temperature gradient?

I also dont think I can use custom field function for this purpose since it wont be possible to get the time-mean value.

Any suggestion would be great.

Cheers
Negin

nenazarian · October 28, 2012, 18:34

$\\frac{partial_T}{\partial_y}$

October 27, 2012, 18:50	Time-mean Nusselt Number	#1
nenazarian Member Negin Nazarian Join Date: Jan 2012 Location: San Diego Posts: 61 Rep Power: 15	Dear All, Im looking for a suggestion on how to do this in the best way: I would like to calculate time-mean Nusselt number but I do not trust pre-defined Nu# in fluent. ( I am solving radiation as well as convection and the value for total heat transfer coefficient accounts for both) I would like to calculate Nusselt number from temperature gradient and I know there is a UDF for that purpose. However, how would it be possible to calculate the time-mean temperature gradient? I also dont think I can use custom field function for this purpose since it wont be possible to get the time-mean value. Any suggestion would be great. Cheers Negin

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October 28, 2012, 18:34		#2
nenazarian Member Negin Nazarian Join Date: Jan 2012 Location: San Diego Posts: 61 Rep Power: 15	$\\frac{partial_T}{\partial_y}$