Turbulence intensity

LaGurk · April 29, 2012, 05:24

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.

truffaldino · April 29, 2012, 07:29

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

LaGurk · May 3, 2012, 04:27

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.

truffaldino · May 3, 2012, 07:16

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.

LaGurk · May 3, 2012, 10:53

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.

April 29, 2012, 05:24	Turbulence intensity	#1
LaGurk New Member Join Date: Apr 2012 Posts: 6 Rep Power: 13	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.

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April 29, 2012, 07:29		#2
truffaldino Senior Member Join Date: Jan 2011 Posts: 249 Blog Entries: 5 Rep Power: 17	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
LaGurk New Member Join Date: Apr 2012 Posts: 6 Rep Power: 13	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
truffaldino Senior Member Join Date: Jan 2011 Posts: 249 Blog Entries: 5 Rep Power: 17	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
LaGurk New Member Join Date: Apr 2012 Posts: 6 Rep Power: 13	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.