|September 10, 2009, 04:58||
Turbulence length scale and integral length scale
Join Date: Jun 2009
Posts: 2Rep Power: 0
I have a question about turbulence length scale and integral length scale.
I am right now doing a CFD simulation about Wind Turbine by using CFX with kappa-Omega 2-Equation turbulence model. In order to specify the turbulence level at the inlet (about 20% turbulence intensity ), i need to give the value of turbulence length scale and turbulence kinetic energy. But, i just know the intergral length scale at the inlet which is equal the chord length of the blade. How can i convert the integral length scale into turbulence length scale.
Another method is that i can give the value of kinetic energy (kappa) and turbulence frequency (Omega). But, in order to calculate the omega, i need to know eddy viscosity ratio. Dose anyone know the eddy viscosity ratio of water at temperature 20° C?
Thank you very much
PS: i am using kappa-omega model and with very high turbulence level (20%)
Last edited by rizhang; September 10, 2009 at 05:13. Reason: refinement
|September 10, 2009, 06:38||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,958Rep Power: 85
|Thread||Thread Starter||Forum||Replies||Last Post|
|Integral Length Scale vs Turbulent Length Scale||Scott Nordsen||FLUENT||2||January 20, 2014 02:17|
|estimation of integral time scale||Clementine||FLUENT||0||February 28, 2008 12:29|
|LES inlet length scale||f.neilson||Main CFD Forum||0||January 31, 2005 14:26|
|Von Karman Integral Length Scale||Txingurri||Main CFD Forum||0||May 2, 2002 12:05|
|Turbulence integral lengthscale and mixing-length||Ray||Main CFD Forum||1||September 12, 2001 19:51|