A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

A. U. Weerasuriya, K. T. Tse, Xuelin Zhang, S. W. Li

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

The influence of twisted wind flows on the pedestrian-level wind (PLW) field of an urban area was evaluated by testing a typical urban site (Tsuen Wan, Hong Kong) in a boundary layer wind tunnel. Four twisted wind profiles with different magnitudes and directions of yaw angles were employed to investigate variations in wind speed with the properties of the twisted wind flows at the pedestrian level. An additional conventional wind profile with similar wind speeds and turbulence intensities to the twisted winds but with zero yaw angles was simulated for comparisons. The mean wind speeds at 77 locations including the perimeter, roadsides, and groups of high-rise buildings were analysed for the conventional and the four twisted wind flows. The comparisons show a tendency of twisted winds to generate higher wind speeds at the pedestrian level than the conventional wind profile. The wind speeds of the twisted winds have a strong dependence on the magnitude and direction of the yaw angles, particularly at locations where the densities of buildings in the neighbourhood are low and hence local wind circulations are significantly modified by the twisted winds.

Original languageEnglish
Pages (from-to)225-235
Number of pages11
JournalBuilding and Environment
Volume128
DOIs
Publication statusPublished - 1 Jan 2018
Externally publishedYes

Keywords

  • Pedestrian wind comfort
  • Pedestrian-level wind environment
  • Twisted wind profile
  • Urban wind field
  • Wind tunnel test

Fingerprint

Dive into the research topics of 'A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment'. Together they form a unique fingerprint.

Cite this