TY - JOUR
T1 - Estimation of aerodynamic parameters of urban building arrays using wind tunnel measurements
AU - Zaki, Sheikh Ahmad
AU - Hagishima, Aya
AU - Tanimoto, Jun
AU - Mohammad, Ahmad Faiz
AU - Razak, Azli Abd
PY - 2014/4
Y1 - 2014/4
N2 - The aim of this study is the experimental determination of a centre height of moment of drag force Hc, which is assumed to coincide with displacement height d on the basis of Jackson's theory. The authors performed a series of wind tunnel experiments on the spatial distribution of pressure drag acting on walls of rectangular block arrays arranged in staggered, square, and diamond layouts under the conditions of different roughness packing densities, i.e., 7.7%, 17.4%, 30.9%, and 39.1%. Total drag and wind profile of the arrays were preliminarily measured by a floating drag balance and a hot-wire anemometer, and roughness length zo and d were derived using two-parameter fitting in our previous work. Hc values determined by the pressure drag measurement were compared with d of our previous work. The results show that the estimated Hc values for staggered and square arrays are significantly smaller than d except for the data of lowest packing density. Moreover, the zo values estimated using one-parameter fitting and measured Hc are slightly larger than those of previous work for the three arrays with high packing density. Although inconsistencies of Hc and d exist, it is likely that Hc could be explained as d for a range of low packing densities, i.e., below 30.9%. The present results suggest the necessity of both more accurate data of spatially averaged wind profile and direct measurement of Hc for experimental determination of the roughness length and displacement height of a block array.
AB - The aim of this study is the experimental determination of a centre height of moment of drag force Hc, which is assumed to coincide with displacement height d on the basis of Jackson's theory. The authors performed a series of wind tunnel experiments on the spatial distribution of pressure drag acting on walls of rectangular block arrays arranged in staggered, square, and diamond layouts under the conditions of different roughness packing densities, i.e., 7.7%, 17.4%, 30.9%, and 39.1%. Total drag and wind profile of the arrays were preliminarily measured by a floating drag balance and a hot-wire anemometer, and roughness length zo and d were derived using two-parameter fitting in our previous work. Hc values determined by the pressure drag measurement were compared with d of our previous work. The results show that the estimated Hc values for staggered and square arrays are significantly smaller than d except for the data of lowest packing density. Moreover, the zo values estimated using one-parameter fitting and measured Hc are slightly larger than those of previous work for the three arrays with high packing density. Although inconsistencies of Hc and d exist, it is likely that Hc could be explained as d for a range of low packing densities, i.e., below 30.9%. The present results suggest the necessity of both more accurate data of spatially averaged wind profile and direct measurement of Hc for experimental determination of the roughness length and displacement height of a block array.
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M3 - Article
AN - SCOPUS:84894517250
VL - 9
SP - 176
EP - 190
JO - Journal of Engineering Science and Technology
JF - Journal of Engineering Science and Technology
SN - 1823-4690
IS - 2
ER -