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Large-eddy simulation of turbulent boundary layer flow over multiple hills

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Abstract

Atmospheric boundary layer (ABL) flow over multiple-hill terrain is studied numerically. The spectral vanishing viscosity (SVV) method is employed for implicit large eddy simulation (ILES). ABL flow over one hill, double hills, and three hills are presented in detail. The instantaneous three-dimensional vortex structures, mean velocity, and turbulence intensity in mainstream and vertical directions around the hills are investigated to reveal the main properties of this turbulent flow. During the flow evolution downstream, the Kelvin-Helmholtz vortex, braid vortex, and hairpin vortex are observed sequentially. The turbulence intensity is enhanced around crests and reduced in the recirculation zones. The present results are helpful for understanding the impact of topography on the turbulent flow. The findings can be useful in various fields, such as wind energy, air pollution, and weather forecasting.

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Acknowledgement

This research received other funding agency in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai, 200072, China

    Ying Deng, Kai Leong Chong, Zhi-ming Lu & Bo-fu Wang

  2. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai, 200092, China

    Ying Deng & Yan Li

Authors
  1. Ying Deng
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  2. Kai Leong Chong
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  3. Yan Li
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  4. Zhi-ming Lu
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  5. Bo-fu Wang
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Correspondence to Bo-fu Wang.

Ethics declarations

Conflict of interest: The authors declare that they have no conflict of interest. Bo-fu Wang is an editorial board member for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent: Informed consent was obtained from all individual participants included in the study.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 12372220, 12372219, 11972220, 12072185, 91952102 and 12032016).

Biography: Ying Deng (1990-), Female, Ph. D.

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Deng, Y., Chong, K.L., Li, Y. et al. Large-eddy simulation of turbulent boundary layer flow over multiple hills. J Hydrodyn 35, 746–756 (2023). https://doi.org/10.1007/s42241-023-0050-y

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  • DOI: https://doi.org/10.1007/s42241-023-0050-y

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