Downstream interference effect of low-Scruton-number high-rise buildings under turbulent boundary layer flow
學年 108
學期 2
出版(發表)日期 2020-03-01
作品名稱 Downstream interference effect of low-Scruton-number high-rise buildings under turbulent boundary layer flow
著者 Yuan-Lung Lo; Yi-Chao Li; Yong Chul Kim
著錄名稱、卷期、頁數 Journal of Wind Engineering and Industrial Aerodynamics 198, p.1-18
摘要 This paper investigates the variation of root-mean-square values of acceleration responses and corresponding aerodynamic dampings of two square cross-sectional high-rise buildings with low Scruton numbers due to interference effects caused by neighboring identical buildings. Aero-elastic vibration test is adopted for displacement and acceleration measurements of a rigid, base-pivoted aero-elastic principal building model by a two-directional sway gimbal system. The principal building is manufactured in the shape of a square prism model with an aspect ratio of eight. Twenty close interference locations are of interest, with a special focus on the across-wind responses. Results show that the variations of interfered acceleration responses and estimated damping ratios exhibit different tendencies for different interference locations at different reduced velocities. For the typical upstream interfered effect, the interfering building located at the oblique-upwind locations in this study, the acceleration response with lower Scruton number is suppressed at lower reduced velocities and is amplified at higher reduced velocities. On the other hand, for the secondary downstream interference effect, i.e., the interfering building located at downwind locations, the amplification or reduction in acceleration response is less sensitive to Scruton number but is related to the gap between two buildings. The corresponding response spectra and resultant damping ratios are then calculated to enhance the understanding of different interference mechanisms. Finally, an idealized two-dimensional CFD simulation technique is adopted to further explain the differences between the upstream and downstream interference mechanisms from the viewpoint of the vortex movement between two buildings.
關鍵字 Interference effect;Acceleration response;Aerodynamic damping;Aero-elastic vibration;CFD simulation
語言 en
ISSN 1872-8197
期刊性質 國外
收錄於 SCI
國別 NLD
出版型式 ,電子版

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