Turbulent Flow Fields Over a 3D Hill Covered by Vegetation Canopy Through Large Eddy Simulations

Zhenqing Liu, Yiran Hu, Yichen Fan, Wei Wang and Qingsong Zhou
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Zhenqing Liu: School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Yiran Hu: School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Yichen Fan: School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Wei Wang: Department of Architecture and Building Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa 1528550, Japan
Qingsong Zhou: School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2019, vol. 12, issue 19, 1-18

Abstract: The flow fields over a simplified 3D hill covered by vegetation have been examined by many researchers. However, there is scarce research giving the three-dimensional characteristics of the flow fields over a rough 3D hill. In this study, large eddy simulations were performed to examine the coherent turbulence structures of the flow fields over a vegetation-covered 3D hill. The numerical simulations were validated by the comparison with the wind-tunnel experiments. Besides, the flow fields were systematically investigated, including the examinations of the mean velocities and root means square of the fluctuating velocities. The distributions of the parameters are shown in a three-dimensional way, i.e., plotting the parameters on a series of spanwise slices. Some noteworthy three-dimensional features were found, and the mechanisms were further revealed by assessing the turbulence kinetic energy budget and the spectrum energy. Subsequently, the instantaneous flow fields were illustrated, from which the coherent turbulence structures were clearly identified. Ejection-sweep motion was intensified just behind the hill crest, leading to a spanwise rotation. A group of vertical rotations were generated by the shedding of the vortex from the lateral sides of the hill.

Keywords: turbulent structure; computational fluid dynamics (CFD); large eddy simulations (LES); 3D hill; canopy; flow fields (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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