Calculate RMS fluctuation velocities in FLUENT 16.0

Gemaak · July 21, 2016, 13:11

Hello everyone,

I would like to get RMS of fluctuation velocities but I do not find a way to get them. Because when I activate the data sampling and go to 'Unsteady statistics', I can get the RMSE but not the RMS.

Could you tell me how to get the RMS ?

Thank you

Gemaak

LuckyTran · July 22, 2016, 06:26

You don't find them in that option box. They are new field variables that you can access and do whatever with just like pressure, temperature, etc.

Gemaak · July 22, 2016, 11:31

Thank you.

The problem is that I really need the RMS fluctuation velocities in order to calculate the Pope criterion of my LES. Is there a way (by custom field function or sth else) to calculate the RMS of the fluctuation velocities.
Or better, is there a way to calculate directly the Pope criterion from Fluent ?

Thanks in advance,

Gemaak

July 21, 2016, 13:11	Calculate RMS fluctuation velocities in FLUENT 16.0	#1
Gemaak New Member Join Date: Jul 2016 Posts: 4 Rep Power: 10	Hello everyone, I would like to get RMS of fluctuation velocities but I do not find a way to get them. Because when I activate the data sampling and go to 'Unsteady statistics', I can get the RMSE but not the RMS. Could you tell me how to get the RMS ? Thank you Gemaak

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July 22, 2016, 06:26		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	You don't find them in that option box. They are new field variables that you can access and do whatever with just like pressure, temperature, etc.

July 22, 2016, 11:31		#3
Gemaak New Member Join Date: Jul 2016 Posts: 4 Rep Power: 10	Thank you. The problem is that I really need the RMS fluctuation velocities in order to calculate the Pope criterion of my LES. Is there a way (by custom field function or sth else) to calculate the RMS of the fluctuation velocities. Or better, is there a way to calculate directly the Pope criterion from Fluent ? Thanks in advance, Gemaak