Wake of elongated low-rise building at oblique incidences

Fei Wang, Kit Ming Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


We investigated the turbulent wake of an elongated low-rise building at oblique wind incidence via wind tunnel experiments and numerical simulations. The deflection phenomenon of mean building wake is clearly supported by the downwind trajectory of the point of maximum velocity deficit. A two-step mechanism is proposed for the understanding of the wake deflection process and its evolution in the building wake. The oblique wind incidence leads to a location shift of shear layer flow competition in the near-wake region ("WD1") and then the deflected prevailing wind extends its effect in the far-wake region ("WD2"). The streamwise development of lateral wake deflection predicted from this mechanism, as well as the variations with height due to the three¬dimensional wake structure, compares well with the measurement and simulation results. For avi¬ation safety assessment of wake effect of the present building on aircraft landing, the data are com¬pared to the "1:35 rule" and "7-knot criterion". In addition, the importance of velocity fluctuation is demonstrated with an exceedance probability analysis.

Original languageEnglish
Article number1579
Issue number12
Publication statusPublished - Dec 2021


  • Aviation risk assessment
  • Exceedance probability
  • Oblique wind incidence
  • Three-dimensional wake deflection
  • Velocity deficit

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Atmospheric Science


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