Estimation of local turbulence intensity via mesoscale stability and winds, with microscale shear and terrain

Mark Kelly*

*Corresponding author for this work

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Abstract

Here a framework is given to estimate streamwise turbulence strength (𝜎𝑢, the standard deviation of wind speed) using a combination of microscale and mesoscale data. Via derivation from the mean turbulent kinetic energy budget, a form for mean 𝜎𝑢 in terms of shear exponent (𝛼), stability (Obukhov length), wind speed, and parameters describing the terrain is provided. In particular, microscale map data and a microscale flow model provides complex terrain information such as RIX or flow-inclination angle, to estimate the effect of excess terraininduced turbulence; further, a microscale flow model can be used to get the local 𝛼 per wind direction, while a mesoscale model such as WRF can be used to obtain the wind speed and Obukhov length.
Towards satisfying the IEC 61400-1 standard, this estimate of mean 𝜎𝑢 is extended to give forms for the representative turbulence (90th percentile) as well as its linear variation with wind speed.
Original languageEnglish
Place of PublicationRisø, Roskilde, Denmark
PublisherDTU Wind Energy
Number of pages18
ISBN (Electronic)978-87-93549-80-7
Publication statusPublished - 2020
SeriesDTU Wind Energy E
Number0213

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