Effects of lift-up design on pedestrian level wind comfort in different building configurations under three wind directions

Yaxing Du, Cheuk Ming Mak, Jianlin Liu, Qian Xia, Jianlei Niu, K. C.S. Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

75 Citations (Scopus)

Abstract

In order to improve the weak wind condition, the lift-up design has been used for some time. However, there is a lack of understanding and quantitative assessment of its modification on the pedestrian level wind comfort around different building configurations under different wind directions. This paper aims to study the effects of lift-up design in four common building configurations on the wind comfort via computational fluid dynamics (CFD) simulations. The turbulence model and numerical method are firstly validated by comparing the simulated wind flow data with the wind tunnel test results. The validated model is then utilized to simulate the four building configurations, including the “─”, “L”, “U” and “□” shaped buildings. The mean wind velocity ratio (MVR) and mean wind velocity change ratio (ΔMVR) are employed to identify the wind comfort and to quantitatively evaluate the improvements due to the lift-up design. Results show that the lift-up design can improve the wind comfort in building surroundings and its influence is highly dependent on the incident wind direction. Specifically, the wind comfort is better under the oblique wind direction than the other two wind directions. These findings can provide us a better understanding of the lift-up design and will be helpful in better precinct planning.
Original languageEnglish
Pages (from-to)84-99
Number of pages16
JournalBuilding and Environment
Volume117
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • CFD simulation
  • Lift-up design
  • Mean wind velocity change ratio (ΔMVR)
  • Mean wind velocity ratio (MVR)
  • Pedestrian level wind comfort

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

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