Experimental Investigation on Pedestrian-level Wind Environment Around a High-rise Building
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State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

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TU023;TU317

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    Abstract:

    The pedestrian level wind environment around a single square cross-sectional high-rise building (within 12 meters of bottom area) was investigated in the wind tunnel, and the distribution and variation of the parameters such as speed-up ratio and RM (mean wind velocity ratio) at different wind direction angles were studied. Meanwhile, by employing the meteorological data of Guangzhou and the Lawson criterion of wind comfort, the pedestrian level wind environment under strong wind in this region was evaluated. The results show that the maximum speed-up ratios at different wind direction angles are approximately equal to 1.9, and all appear at the corner of the leeward side of the building. The areas with the RM greater than 0.75 also appear at the corner of the leeward side of building, which is likely to cause pedestrian wind discomfort. Besides, the area of pedestrian wind discomfort is the largest when the wind direction is perpendicular to the wall. Attention should be paid to the increase of wind speed caused by the downwash effect at pedestrian level. In the wind direction angle range of 20 to 70 degrees, the area with unfavorable ventilation is quite large, which may cause adverse results in diffusion of air pollutants. The greatest gust equivalent mean wind speed appears at the corners of the windward and leeward sides of the building, and pedestrian activities in these areas should be restricted or reminded.

    Table 1
    Table 2
    Fig.1 Experimental setup
    Fig.2 Irwin probe and its arrangement (unit: mm)
    Fig.3 Flow condition of approach flow: velocity profile and turbulence profile
    Fig.4 Distribution of the K value under different wind direction angles
    Fig.5 Distribution of the RM value under different wind direction angles
    Fig.6 Relative area ratios of high and low wind speed zones varies with the wind direction angles
    Fig.7 Distribution of the normalized gust equivalent mean speed ratio at different wind direction angles
    Reference
    [1] BLOCKEN B, CARMELIET J. Pedestrian wind environment around buildings: literature review and practical examples[J]. Journal of Thermal Envelope and Building Science, 2016, 28(2): 107.
    [2] WISE A F E. Effects due to groups of buildings[M]. [S.l.]: Ministry of Public Building and Works, 1970.
    [3] BERANEK W J, KOTEN H VAN . Beperken van windhinder om gebouwen [M]. Deventer: Kluwer Technische Boeken, 1982.
    [4] TSANG C W, KWOK K C S, HITCHCOCK P A. Wind tunnel study of pedestrian level wind environment around tall buildings: effects of building dimensions, separation and podium[J]. Building and Environment, 2012, 49: 167.
    [5] QUAN Yong, WANG Shuo, GU Ming. Assessment of pedestrian level wind environment of a group of high-rise buildings based on numerical simulation[J]. Applied Mechanics and Materials, 2012, 209/211: 1553.
    [6] MITTAL H, SHARMA A, GAIROLA A. Numerical simulation of pedestrian level wind flow around buildings: effect of corner modification and orientation[J]. Journal of Building Engineering, 2019, 22: 314.
    [7] 徐晓达. 超高层建筑周边行人高度处平均风速分布特性及风环境评估[D]. 北京:北京交通大学, 2019.
    [8] WU H, STATHOPOULOS T. Further experiments on Irwin’s surface wind sensor[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1994, 53(3): 441.
    [9] IRWIN H P A H. A sample omnidirectional probe for the measurement of pedestrian level winds[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1981, 7(3): 219.
    [10] 余世策,陈勇,李庆祥,等.建筑风环境风洞试验中风速探头的研制与应用[J]. 实验流体力学, 2013(4): 83.
    [11] TSE K T, WEERASURIYA A U, ZHANG X. Pedestrian-level wind environment around isolated buildings under the influence of twisted wind flows[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2017,162: 12.
    [12] STATHOPOULOS T, WU H, BéDARD C. Wind environment around buildings:a knowledge-based approach[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1992, 44(1): 2377.
    [13] BLOCKEN B, STATHOPOULOS T, BEECK J P A J VAN . Pedestrian-level wind conditions around buildings: review of wind-tunnel and CFD techniques and their accuracy for wind comfort assessment[J]. Building and Environment, 2016, 100: 50.
    [14] SANZ-ANDRES A, CUERVA A. Pedestrian wind comfort: feasibility study of criteria homogenisation[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2006, 94(11): 799.
    [15] DU Y X, MAK C M, KWOK K, et al. New criteria for assessing low wind environment at pedestrian level in Hong Kong [J]. Building and Environment, 2017, 123: 23.
    [16] MITTAL H, SHARMA A, GAIROLA A. A review on the study of urban wind at the pedestrian level around buildings[J]. Journal of Building Engineering, 2018, 18: 154.
    [17] LAWSON T V. The determination of the wind environment of a building complex before construction[M]. Bristol: University of Bristol, 1990.
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XIE Zhuangning, LU Yu, YU Xianfeng. Experimental Investigation on Pedestrian-level Wind Environment Around a High-rise Building[J].同济大学学报(自然科学版),2020,48(12):1726~1732

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History
  • Received:May 24,2020
  • Online: December 31,2020
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