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Effects of Fetch on Turbulent Flow and Pollutant Dispersion Within a Cubical Canopy

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Abstract

The effects of fetch on turbulent flow and pollutant dispersion within a canopy formed by regularly-spaced cubical objects is investigated using large-eddy simulation. Six tracer gases are simultaneously released from a ground-level continuous pollutant line source placed parallel to the spanwise axis at the first, second, third, fifth, seventh and tenth rows. Beyond the seventh row, the standard deviations of the fluctuations in the velocity components and the Reynolds shear stresses reach nearly equivalent states. Low-frequency turbulent flow is generated near the bottom surface around the first row and develops as the fetch increases. The turbulent flow eventually passes through the canopy at a near-constant interval. The mean concentration within the canopy reaches a near-constant value beyond the seventh row. In the first and second rows, narrow coherent structures frequently affect the pollutant escape from the top of the canopy. These structures increase in width as the fetch increases, and they mainly affect the removal of pollutants from the canopy.

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Acknowledgements

This research was supported by the Japan Society for the Promotion of Science (JSPS), KAKENHI (15K06343).

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Authors and Affiliations

  1. Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashiōsaka, Osaka, 577-8502, Japan

    Takenobu Michioka

  2. Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 646 Abiko, Abiko-shi, Chiba-ken, 270-1194, Japan

    Hiroshi Takimoto, Hiroki Ono & Ayumu Sato

Authors
  1. Takenobu Michioka
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  2. Hiroshi Takimoto
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  3. Hiroki Ono
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  4. Ayumu Sato
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Correspondence to Takenobu Michioka.

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Michioka, T., Takimoto, H., Ono, H. et al. Effects of Fetch on Turbulent Flow and Pollutant Dispersion Within a Cubical Canopy. Boundary-Layer Meteorol 168, 247–267 (2018). https://doi.org/10.1007/s10546-018-0339-5

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  • DOI: https://doi.org/10.1007/s10546-018-0339-5

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