how fluent defines Nusselt number

thuanvu · October 4, 2016, 12:02

Hi guys
I am new here, and I do not know how FLUENT defines Nusselt number. Could anyone tell me how it defines? I have looked for the definition in the Help tab in FLUENT, but I didn't see any definition for Nusselt number yet.

LuckyTran · October 6, 2016, 00:42

Fluent uses typical definitions.

The simple answer which is 99% correct is:

Nu = h*Lref/kref
h = q"/(Twall-Tref)

Lref, kref, and Tref user specified values in the reference values pane. If you want to know the last 1%, you need to appreciate how the heck do you calculate q" which requires a certain level of knowledge of the FVM method.

October 4, 2016, 12:02	how fluent defines Nusselt number	#1
thuanvu New Member Join Date: Jul 2016 Posts: 1 Rep Power: 0	Hi guys I am new here, and I do not know how FLUENT defines Nusselt number. Could anyone tell me how it defines? I have looked for the definition in the Help tab in FLUENT, but I didn't see any definition for Nusselt number yet.

October 6, 2016, 00:42		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,673 Rep Power: 65	Fluent uses typical definitions. The simple answer which is 99% correct is: Nu = h*Lref/kref h = q"/(Twall-Tref) Lref, kref, and Tref user specified values in the reference values pane. If you want to know the last 1%, you need to appreciate how the heck do you calculate q" which requires a certain level of knowledge of the FVM method. thuanvu likes this.

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