Information on pedestrian-level wind(PLW)speed for wind comfort assessment can be obtained by wind-tunnel measurements or Computational Fluid Dynamics(CFD)***-tunnel measurements for PLW are routinely performed with l...
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Information on pedestrian-level wind(PLW)speed for wind comfort assessment can be obtained by wind-tunnel measurements or Computational Fluid Dynamics(CFD)***-tunnel measurements for PLW are routinely performed with low-cost techniques such as hot-wire or hot-film anemometers,Irwin probes or sand erosion,while Laser-Doppler Anemometry(LDA)and Particle-Image Velocimetry(PIV)are less often used because they are more *** simulations are routinely performed by the relatively low-cost steady Reynolds-AveragedNavier-Stokes(RANS)***-Eddy Simulation(LES)is less often used because of its larger complexity and *** paper reviews wind-tunnel and CFD techniques to determine PLW speeds expressed generally in terms of amplification factors defined as the ratio of local mean wind speed to mean wind speed at the same position without buildings *** comparative studies systematically indicate that the low-cost wind-tunnel techniques and steady RANS simulations can provide accurate results(~10%)at high amplification factors(>1)while their accuracy can deteriorate at lower amplification factors(de the largest contribution to the discomfort exceedance probability in the comfort *** LDA,PIV and LES are inherently more accurate techniques,this paper supports the continued use of faster and less expensive techniques for PLW *** a previous saying,we argue that pedestrian-level wind comfort is one of the few topics in wind engineering where nature is kind to us concerning turbulent flows.
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