Pedestrian level wind comfort, natural ventilation and pollutant dispersion are strongly influenced by building shape and orientation. In the recent years, the trend of building shape is not restricted to basic square and rectangular cross-section, and various unconventional shapes are also considered. Considering this fact, the present study is focused on the investigation of different building shape with major and minor modifications on the pedestrian level wind environment and aims to evaluate the effect of different building shapes on the extent of different wind conditions surrounding the building systematically. An investigation was performed using a computational fluid dynamics (CFD) approach based on realizable \(k - \varepsilon\) model and the standard \(k - \varepsilon\) turbulence model with revised closure coefficients for different orientation (\(\theta = 0^\circ\), \(22.5^\circ\) and \(45^\circ\)) and shape of buildings. Further, wind tunnel experiment was conducted to validate the CFD results. The results of CFD simulations obtained using realizable \(k - \varepsilon\) model fairly match with experimental values for high wind speed conditions, whereas the standard \(k - \varepsilon\) with LK modification and revised closure coefficients performs better for the low wind speed regions. It was observed that the wind conditions at the pedestrian level are influenced mostly by corner modification and projected width at 1/3rd height of the building from the ground.

中文翻译：

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行人水平风情况的数值模拟：建筑物形状和方向的影响

行人水平的风舒适度，自然通风和污染物扩散受到建筑物形状和方向的强烈影响。近年来，建筑物形状的趋势不限于基本的正方形和矩形横截面，并且还考虑了各种非常规形状。考虑到这一事实，本研究集中在对行人水平风环境进行主要和次要修改的不同建筑物形状的研究上，旨在系统地评估不同建筑物形状对建筑物周围不同风况的影响。使用基于可实现的\（k-\ varepsilon \）模型和标准\（k-\ varepsilon \）的计算流体动力学（CFD）方法进行了研究修正了不同方向（\（\ theta = 0 ^ \ circ \），\（22.5 ^ \ circ \）和\（45 ^ \ circ \））和建筑物形状的封闭系数的湍流模型。此外，进行风洞实验以验证CFD结果。使用可实现的\（k-\ varepsilon \）模型获得的CFD模拟结果与高风速条件下的实验值完全匹配，而具有LK修改和修改后的封闭系数的标准\（k-\ varepsilon \）对于低风速地区。据观察，行人水平的风况主要受转角修改和建筑物距地面1/3高度的投影宽度的影响。