|August 24, 2012, 14:13||
Turbulent dissipation rate effect turbine torque??
LEE SE DONG
Join Date: Feb 2012
Posts: 2Rep Power: 0
I want to know turbulent dissipation rate (specific dissipation rate) effect.
I am simulating a horizontal wind turbine using the K-epsilon turbulence and sst k omega turbulence model.
when i see the torque result of the simulation, i know that the results is very different from the reference.
(especially, K epsilon turbulence)
As you know, there are a lot of turbulence boundary condition.
I use the turbulence intensity and turbulence viscosity ratio.
When I input the large viscosity ratio, it makes the dissipation rate small according to the formula; vice versa.
( you can see the formula http://www.cfd-online.com/Wiki/Turbu...ary_conditions )
So, I knew the dissipation rate effects turbine torque.
But I think that specific dissipation rate in K omega model doesn't effect the result in comparison with the k epsilon model.
Is that true??
In conclusion, I want to know the two things.
first, How does the dissipation rate effect the wind turbine torque?
second, is it true that SST K omega turbulence model is not sensitive to the dissipation rate in comparison with K-epsilon model?
(in K-omega model, specific dissipation rate!)
I am waiting for the kind response.
|Thread||Thread Starter||Forum||Replies||Last Post|
|changing a variable (turbulence dissipation rate) formolation||m.beh||Fluent UDF and Scheme Programming||6||November 7, 2016 06:53|
|Eddy Dissipation Rate for LES||rsin||CFX||13||September 3, 2015 12:20|
|Turbulent viscosity and shear rate||shib||FLUENT||0||June 22, 2010 12:44|
|Turbulent dissipation rate in UDF||John Deas||FLUENT||0||February 20, 2009 13:27|
|How to calculate Torque for francis turbine||manish||CFX||4||March 15, 2007 03:57|