Abstract
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 aviation safety assessment of wake effect of the present building on aircraft landing, the data are compared to the “1:35 rule” and “7-knot criterion”. In addition, the importance of velocity fluctuation is demonstrated with an exceedance probability analysis.
Highlights
The turbulent wake of a surface-mounted finite-length rectangular prism has been extensively investigated in the past decades
We focus more on the far-wake deflection, covering x (m) ∈ [200, 350], which means we can compare the effect of WD2 by the slope change of the trajectory
Aiming at a better understanding of the three-dimensional wake deflection, the streamwise development of maximum deficit trajectories at different heights is shown in Figure 7 with the help of Computational Fluid Dynamics (CFD) simulations
Summary
The turbulent wake of a surface-mounted finite-length rectangular prism has been extensively investigated in the past decades. Computational Fluid Dynamics (CFD) Simulation To obtain the flow field over a much larger region of the same building models, CFD studies were carried out to supplement the wind tunnel PIV measurements. These 3e.xRpeesruimltesnatnadl PDIViscduastasiaorne all normalized by the mean velocity of the free field (i.e., with3o.1u.tTbhurieled-iDnigmmenosdioenlsa)l.MFoeranthWe wakheoDleeflpeiccttiuonre of the mean wake pattern, the CFD simulation 3r.e1s.1u.ltMs eaaren iWlluaskteraDteedfleinctiFoinguPrhee3n.oTmheenPoInV data in the near-wake (ROI-1) region are showTnhefotirmceo-mavpearraisgoend. Contours of U/Ure f in the far-wake (ROI-2) region at the height of 10 m: (a) 22.5◦; (b) 45◦; (c) 67.5◦
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