peak coherent turbulent kinetic energy

Discuss the effects of turbulence on wind turbines and its simulation.

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Jian.Li
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Organization: Envision Energy
Location: China

peak coherent turbulent kinetic energy

Postby Jian.Li » Fri Apr 06, 2012 12:11 am

I see much use of the peak coherent turbulent kinetic energy in tech report about TurbSim. But I really want to know how the peak Ecoh is defined. Is it the peak value in every 10 minutes or so?

Bonnie.Jonkman
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Re: peak coherent turbulent kinetic energy

Postby Bonnie.Jonkman » Fri Apr 06, 2012 10:23 am

Ecoh is defined as 0.5*sqrt( (u'w')^2 + (u'v')^2 + (v'w')^2 ), where u', v', and w' are the fluctuating parts of the streamwise, transverse, and vertical wind speeds. By fluctuating, I mean that the average wind speed--typically over a 10-minute period--has been removed. (By definition, the u component is aligned with the average wind direction over a given time period--again, typically 10 minutes. Thus, the average transverse wind speed and average vertical wind speed are both zero over that time period.) The peak value in Neil's report is the maximum value of Ecoh over that 10 minute period.
Bonnie Jonkman

Envision Energy USA, 2016-
National Renewable Energy Laboratory, 2003-2016


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