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-   -   Time-mean Nusselt Number (http://www.cfd-online.com/Forums/fluent/108598-time-mean-nusselt-number.html)

nenazarian October 27, 2012 17:50

Time-mean Nusselt Number
 
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}


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