Abstract
ABSTRACTKnowledge of wind effects is of great significance in structural, environmental, and architectural fields, where excessive relevance among wind pressure, building load, and natural ventilation has been formerly confirmed. Within the scope of high-rise buildings, functions of their layout, separation and height in altering wind pressure have been inquired on purpose, while a few investigations in relation to impacts of plane dimensions have been explored. This study consequently intends to ascertain wind pressure distributions on and around various squared-shaped tall buildings by the application of Computational Fluid Dynamics techniques. To start with, models established by the Common Advisory Aeronautical Research Council (CAARC) were simulated, for the purpose of correctness comparison, and reliability verification. Hereafter, wind pressure distributing on buildings was predicted under two scenarios, namely height-width (HW) and height-thickness (HT). Results evidenced that both HW ratio and HT ratio exerted great influence on wind characteristics of buildings. Positive pressure on building surface generally varied greatly, where a narrower windward tended to suffer higher wind pressures, while a larger one was corresponding to severer negative wind effects. The thickness played little influence on altering positive wind pressure. Prominently, pressure distributed on leeward surfaces showed great differences, whereas wind effects on leeward and side surface were strengthened. Likewise, both positive and negative effects around buildings were magnified by larger widths, while negative effects became feeble along the increasing building thickness.
Highlights
Wind effects are closely associated with building load and natural ventilation in building science
Wind profiles such as exponential law, logarithmic law, and modified logarithmic law were developed on basis of regression methods, after long-term meteorological monitoring and wind tunnel tests. These models are diffusely approved and adopted, values of several parameters are discrepant in released international wind regulations and codes (Kwon & Kareem, 2013). These profiles are of vital importance in turbulent models, which affect the reliability of numerical simulation in Computational Fluid Dynamics (CFD) techniques
Absolute error = Cp CFD − Cp tunnel × 100% (6) Cp tunnel where Cp CFD represents mean wind pressure coefficient calculated via CFD techniques; Cp tunnel is the results obtained via wind tunnel test at CU, BU, MU, NAE(a), NAE(b), and NPL
Summary
Wind effects are closely associated with building load and natural ventilation in building science. Scholars (Tanaka, Tamura, Ohtake, Nakai, & Kim, 2012) measured wind feature of square-shaped tall buildings with corner cut, setbacks and helical configurations, among which helical one endured better wind fields than other sorts of novelties, so that it could be utilized to significantly lower wind loads They deduced that both overturning moments and spectral densities showed the tendency to decrease with increasing twist angle, while just small differences could be noted when the twist angle was larger than 180° Sequentially, Kim and Kanda (2013) followed with interest tapered and set-back tall buildings, exhibiting that mean pressure on the windward was almost same, while the negative one was obviously different because of the diversity in geometry. The anticipation of this investigation is to inform engineers and architects with basic understanding in relation with natural ventilation in both indoor and outdoor environments
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