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Turbulent diffusion–cascade interaction
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DOI：10.1017/jfm.2025.11111.png)
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Abstract
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In the decay region around the centreline of three qualitatively different turbulent plane wakes; the turbulence is non-homogeneous and two-point turbulent diffusion counteracts the turbulence cascade all the way down to scales smaller than the Taylor length. It is found that the sum of the inter-space transfer rate and the horizontal part of the inter-scale transfer rate of horizontal two-point turbulent kinetic energy is approximately proportional to the turbulence dissipation rate in the inertial range with a constant of proportionality between depending on wake and location within the wake; except at the near-field edge of the decay region.
Keywords:
wakes
turbulence theory
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