How to obtain the turbulent kinetic energy for large eddy simulation through FLUENT

Huo zero · November 16, 2018, 22:05

Dear all,
Thanks for your attention!
I have a question about how to get fluctuation velocity or the turbulent kinetic energy or root mean square velocity when using LES through FLUENT. Can anyone tell me something about this? or some idea about this?
Waiting for your reply eagerly!

LuckyTran · November 18, 2018, 01:40

Turn on data sampling for time statistics (it's close to the calculate button) and you'll get rmse's for the velocity. To get the turbulent kinetic energy though, you need to define a custom field function as the sum of the components (x,y,z).

However, watch out that the velocity in LES is the filtered velocity so this gives only the resolved part of the tke. You need to add the contribution of the subgrid scales too.

November 16, 2018, 22:05	How to obtain the turbulent kinetic energy for large eddy simulation through FLUENT	#1
Huo zero New Member Huo Join Date: Mar 2018 Posts: 8 Rep Power: 8	Dear all, Thanks for your attention! I have a question about how to get fluctuation velocity or the turbulent kinetic energy or root mean square velocity when using LES through FLUENT. Can anyone tell me something about this? or some idea about this? Waiting for your reply eagerly!

November 18, 2018, 01:40		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Turn on data sampling for time statistics (it's close to the calculate button) and you'll get rmse's for the velocity. To get the turbulent kinetic energy though, you need to define a custom field function as the sum of the components (x,y,z). However, watch out that the velocity in LES is the filtered velocity so this gives only the resolved part of the tke. You need to add the contribution of the subgrid scales too. roi247 likes this.

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