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Turbulent dissipation rate effect turbine torque?? |
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August 24, 2012, 15:12 |
Turbulent dissipation rate effect turbine torque??
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LEE SE DONG
Join Date: Feb 2012
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Hello^^
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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