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That’s where the new experiments from Küchler and company come in. C. Küchler et al., “Universal velocity statistics in decaying turbulence,” Phys. The one exception is Kolmogorov’s so-called 4/5 law for the third-order statistical moment of the velocity increment (the difference in the fluid velocity at two points separated by a distance r). The team focused on the second-order moment of the velocity increments, a quantity that is related to the distribution of kinetic energy among the scales of the flow. In this review, we summarize current understanding of these flow phenomena (particularly mean and second-order statistics) through field studies, wind tunnel experiments, large-eddy simulations, and analytical modeling, emphasizing the most relevant features for wind farm design and operation. From a fluid mechanics perspective, wind farms encompass turbulent flow phenomena occurring at many spatial and temporal scales. Perhaps these effects protrude down to scales much smaller than previously thought. Jonathan Zittrain has said users sharing responsibility for computing safety is far preferable to locking down the Internet. Where there is little organic matter, the necessary compounds can be added with packaged fertilizers, but they do not address soil texture, and it can be difficult to add every necessary trace mineral that natural organic matter will provide.
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