# Turbulence intensity

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 April 29, 2012, 05:24 Turbulence intensity #1 New Member   Join Date: Apr 2012 Posts: 6 Rep Power: 6 Hello community, I do some simulations in an artificial homogeneous isotropic turbulence where k and eps are given. Does anyone know, how to calculate the turbulence intensity out of these values? Thanks so long.

 April 29, 2012, 07:29 #2 Senior Member     Join Date: Jan 2011 Posts: 247 Blog Entries: 5 Rep Power: 9 You can just take a look at Fluent manual 6.2.2 determining the turbulence parameters Relationships between the turbulence quantities e.g. here http://jullio.pe.kr/fluent6.1/help/html/ug/node178.htm Truffaldino

 May 3, 2012, 04:27 #3 New Member   Join Date: Apr 2012 Posts: 6 Rep Power: 6 Thanks for that link. My problem is, that in a homogeneous isotropic turbulence the average fluid velocity is 0? That means I cannot calculate the turbulence intensity with the given formulas. Does anybody know, how to solve my problem. Or maybe I am wrong.

 May 3, 2012, 07:16 #4 Senior Member     Join Date: Jan 2011 Posts: 247 Blog Entries: 5 Rep Power: 9 Could you tell more about details of your simulation? If you do not have a reference speed, you could derive "reference speed" from the average energy flow per unit mass through the system.

 May 3, 2012, 10:53 #5 New Member   Join Date: Apr 2012 Posts: 6 Rep Power: 6 I am simulating particle collisions using a Lagrangian code. The fluent is just given by k and eps in the domain. The local fluid velocity for particle tracking is calculated using k and eps by a langevin dispersion model. For characterising the turbulence I want to give the turbulence intensity.

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