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

在香野三崎风效实验室进行了室外测量，并在京都大学动力工程研究所进行了风洞实验和数值模拟。研究了在自然风作用下高层建筑模型周围流型的形成。主要研究结果如下：1.分析了在自然风新概念、流道曲率和流型形成长度等条件下，阵风作用下低层和高层建筑模型周围流型的形成。风洞中障碍物周围的流场特征与自然风的差异。2.通过对棱镜模型风压的多次同步测量，发现局部强吸力是由棱镜模型侧面的两个锥形涡旋引起的。3.强风测量是在9426号台风期间在白滨实验室进行的。用k-epsilon模式模拟了城市地区的风特征，并利用实验数据对湍流边界层进行了数值模拟。4.从广岛市房屋开发损坏的调查结果来看，作者推测大风是从山上向下吹来的。

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.