k-epsilon set up

marine · March 19, 2010, 05:42

Hello everybody !
I'm new in CFD's world and I'm having my firsts steps on OpenFOAM.
I'm trying simple simulation of turbulent flow and I'd like to know if there is a "type" for K and epsilon allowing to set boundary conditions with the values of turbulent intensity and turbulent length scale or turbulent viscosity ratio.
Thank you very much for your answers and excuse me for this bad english.

maruthamuthu_venkatraman · March 19, 2010, 08:45

Hi,
SInce u said you are new in OF i assume you dont know how to setup K E model in Foam. I usually give k and epsilon calculated based on intensity and viscosity ratios for inlet. This iam sure about it.

However in 1.6 there seems to have nut (turb viscosity) may be you can specify nut based on viscosity ratio and k seperately for intensity. Epsilon may be calculated at inlet. This you can try and see if it accepts

Regards

Stylianos · March 19, 2010, 09:26

Hello Marin e

Check this thread out (http://www.cfd-online.com/Forums/ope...lon-model.html) an also give a look at the rhoPorousSimpleFoam/angledDuctImplicit/0 tutorial

Stelios

marine · March 23, 2010, 03:10

thank you for your answers they helped me a lot !

March 19, 2010, 05:42	k-epsilon set up	#1
marine Member Marine Join Date: Mar 2010 Posts: 38 Rep Power: 16	Hello everybody ! I'm new in CFD's world and I'm having my firsts steps on OpenFOAM. I'm trying simple simulation of turbulent flow and I'd like to know if there is a "type" for K and epsilon allowing to set boundary conditions with the values of turbulent intensity and turbulent length scale or turbulent viscosity ratio. Thank you very much for your answers and excuse me for this bad english.

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March 19, 2010, 08:45		#2
maruthamuthu_venkatraman Member Maruthamuthu Venkatraman Join Date: Mar 2009 Location: Norway Posts: 80 Rep Power: 17	Hi, SInce u said you are new in OF i assume you dont know how to setup K E model in Foam. I usually give k and epsilon calculated based on intensity and viscosity ratios for inlet. This iam sure about it. However in 1.6 there seems to have nut (turb viscosity) may be you can specify nut based on viscosity ratio and k seperately for intensity. Epsilon may be calculated at inlet. This you can try and see if it accepts Regards

March 19, 2010, 09:26		#3
Stylianos New Member Stylianos Kyriacou Join Date: Mar 2010 Location: Cyprus - Athens - Austria - Zurich Posts: 27 Rep Power: 16	Hello Marin e Check this thread out (http://www.cfd-online.com/Forums/ope...lon-model.html) an also give a look at the rhoPorousSimpleFoam/angledDuctImplicit/0 tutorial Stelios

March 23, 2010, 03:10		#4
marine Member Marine Join Date: Mar 2010 Posts: 38 Rep Power: 16	thank you for your answers they helped me a lot !