|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.
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