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Boundary-Layer Meteorology

, Volume 168, Issue 1, pp 127–153 | Cite as

Large-Eddy-Simulation Study of the Effects of Building-Height Variability on Turbulent Flows over an Actual Urban Area

  • Toshiya YoshidaEmail author
  • Tetsuya Takemi
  • Mitsuaki Horiguchi
Research Article

Abstract

Large-eddy simulation (LES) is used to investigate the effects of building-height variability on turbulent flows over an actual urban area, the city of Kyoto, which is reproduced using a 2-m resolution digital surface dataset. Comparison of the morphological characteristics of Kyoto with those of European, North American, and other Japanese cities indicates a similarity to European cities but with more variable building heights. The performance of the LES model is validated and found to be consistent with turbulence observations obtained from a meteorological tower and from Doppler lidar. We conducted the following two numerical experiments: a control experiment using Kyoto buildings, and a sensitivity experiment in which all the building heights are set to the average height over the computational region \(h_{all}\). The difference of Reynolds stress at height \(z=2.5h_{all}\) between the control and sensitivity experiments is found to increase with the increase in the plan-area index (\(\lambda _p\)) for \(\lambda _p > 0.32\). Thus, values of \(\lambda _p\approx 0.3\) can be regarded as a threshold for distinguishing the effects of building-height variability. The quadrant analysis reveals that sweeps contribute to the increase in the Reynolds stress in the control experiment at a height \(z= 2.5h_{all}\). The exuberance in the control experiment at height \(z=0.5h_{all}\) is found to decrease with increase in the building-height variability. Although the extreme momentum flux at height \(z=2.5h_{all}\) in the control experiment appears around buildings, it contributes little to the total Reynolds stress and is not associated with coherent motions.

Keywords

Actual urban building Large-eddy simulation Atmospheric turbulence Roughness parameter Reynolds stress Quadrant analysis 

Notes

Acknowledgements

We thank three anonymous reviewers for their helpful comments and suggestions. We would like to express our deepest gratitude to Dr. Wim Vanderbauwhede at the University of Glasgow, who helped to create an MPI version of the code. We thank Dr. Hiromasa Nakayama at the Japan Atomic Energy Agency for his guidance on the LES modelling. We also thank Prof. Hajime Nakagawa of Kyoto University for conducting the field measurements at the Ujigawa Open Laboratory. This research partly used computational resources under the Collaborative Research Program for Young Scientists provided by the Academic Centre for Computing and Media Studies, Kyoto University. This study was supported by JSPS Kakenhi grant numbers 26282107 and 16H01846, and DPRI Collaborative Research 28H-04 and 29S-01.

Supplementary material

10546_2018_344_MOESM1_ESM.pdf (401 kb)
Supplementary material 1 (pdf 400 KB)

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Disaster Prevention Research InstituteKyoto UniversityKyotoJapan

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