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以CAARC(英联邦航空咨询理事会)高层建筑物标准模型为研究对象,基于计算流体动力学方法研究了下击暴流作用下高层建筑物的表面风压分布特性,并将结果同大气边界层近地风作用下的风压分布特性进行了比较分析.结果表明:下击暴流作用下建筑物模型迎风面风压力最大值位于建筑物的中下部约1/3高度处,不同于近地风作用下的最大值位于建筑物中上部靠近顶部附近;在背风面,下击暴流作用下负压力分布呈下小上大、中间小两侧大的特征,不同于近地风作用下的负压力分布较为均匀、上下端和两侧较大、中间小的分布特性.
Based on CAARC (Commonwealth Aviation Advisory Council) high-rise building standard model, the surface wind pressure distribution characteristics of tall buildings under the action of downburst were studied based on computational fluid dynamics. The results were compared with the atmospheric boundary layer The wind pressure distribution under near-surface wind is comparatively analyzed.The results show that the maximum windward windward pressure of the building model under the downburst is located at about 1/3 of the height of the middle and lower parts of the building, The maximum value of wind is located in the upper part of the building near the top; under the action of the leeward surface and the downburst, the negative pressure distribution is characterized by small upper part and small middle part, which is different from the large part Negative pressure distribution is more uniform, the upper and lower ends and both sides of the larger, middle distribution characteristics.