Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of turbine spacing on the power output of extended wind-farms   We present results from large eddy simulations (LES) of extended wind-farms
for several turbine configurations with a range of different spanwise and
streamwise spacing combinations. The results show that for wind-farms arranged
in a staggered configuration with spanwise spacings in the range
$\approx[3.5,8]$D, where $D$ is the turbine diameter, the power output in the
fully developed regime depends primarily on the geometric mean of the spanwise
and streamwise turbine spacings. In contrast, for the aligned configuration the
power output in the fully developed regime strongly depends on the streamwise
turbine spacing and shows weak dependence on the spanwise spacing. Of interest
to the rate of wake recovery, we find that the power output is well correlated
with the vertical kinetic energy flux, which is a measure of how much kinetic
energy is transferred into the wind-turbine region by the mean flow. A
comparison between the aligned and staggered configurations reveals that the
vertical kinetic energy flux is more localized along turbine rows for aligned
wind-farms than for staggered ones. This additional mixing leads to a
relatively fast wake recovery for aligned wind-farms.

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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: hep-lat