Study on formation of flow pattern around a high-rise building model due to changes of wind directions under natural wind

在日本京都大学盐野-崎风效应实验室进行了室外测量、风洞实验和数值模拟。研究了自然风作用下高层建筑周围流型的形成。结果总结如下：1。分析了在自然风、新思路、流径曲率和流型形成长度条件下，风对低层和高层建筑模型周围流型形成的影响。风洞中障碍物周围的流场特征与自然风的差异。在野外多次同时测量棱镜模型风压的结果表明，棱镜模型侧面上的两个锥形涡引起了局部强吸力。9426号台风的强风测量在白滨实验室进行。利用k-epsilon模式模拟了城市上空的风场特征，并利用实验数据对湍流边界层进行了数值模拟。根据对广岛市住宅开发的损害调查结果，作者推测是强风，从山上向下吹来。

Outdoor measurements at Shiono-misaki wind effect laboratory, wind tunnel experiments and numerical simulations in D.P.R.I.of Kyoto University were carried. The formation of flow pattern around a high-rise buliding model were studied under natural wind. The results are summarized as follows.1.Formation of flow pattern around low-rise and high-rise building models by gusts were analyzed under natural wind new ideas, a curvature of stream path and a pattern formation length. The difference between the characteristics of flow fields around obstacles in a wind tunnel and natural wind.2.Form the results multi-simultaneous measurements of wind pressures on a prism model on a field, it was showed that local severe suctions were caused by two conical vortices on the side faces of the prism model.3.Measurements of strong winds were carried out at Shirahama laboratory in Typhoon 9426. The characteristics of wind over an urban area were simulated with k-epsilon model, and numerical simulations of a turbulent boundary layr were carried out using experimental data.4.From the results of investigations of damages to housing developments in Hiroshima city, the authors presumed strong winds, which flew downward from mountains.