Time averaged turbulent viscosity for LES

banane5 · August 22, 2019, 13:05

Hi,

I am working on a LES and have some struggle with time averaged data. I activated data sampling for time statistics in fluent and got in post processing mean and rms velocities and rms reynolds stresses. But I also need mean turbulent viscosity to investigate which turbulences are solved and which modeled.

Do I have to write an user defined function to get this or is there an easier way to get more mean values? I would like to avoid UDFs because I did not work with it yet..
I hope you can help me!

Greetings banane5

Svetlana · August 22, 2019, 17:52

In 'run calculation' click 'sampling options'. There you can add other variables to average. They have to be defined as 'custom field functions' first but this is easier than writing a UDF.

banane5 · August 23, 2019, 07:01

That was exactly what I was looking for! Thanks a lot!

August 22, 2019, 13:05	Time averaged turbulent viscosity for LES	#1
banane5 New Member Malte Join Date: Feb 2019 Posts: 3 Rep Power: 7	Hi, I am working on a LES and have some struggle with time averaged data. I activated data sampling for time statistics in fluent and got in post processing mean and rms velocities and rms reynolds stresses. But I also need mean turbulent viscosity to investigate which turbulences are solved and which modeled. Do I have to write an user defined function to get this or is there an easier way to get more mean values? I would like to avoid UDFs because I did not work with it yet.. I hope you can help me! Greetings banane5 Svetlana and wstapel like this.

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August 22, 2019, 17:52		#2
Svetlana Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 416 Rep Power: 15	In 'run calculation' click 'sampling options'. There you can add other variables to average. They have to be defined as 'custom field functions' first but this is easier than writing a UDF.

August 23, 2019, 07:01		#3
banane5 New Member Malte Join Date: Feb 2019 Posts: 3 Rep Power: 7	That was exactly what I was looking for! Thanks a lot!