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Wind velocity changes along the passage between two angled walls - CFD simulations and full-scale measurements

机译：风速沿两个倾斜壁之间的通道变化-CFD模拟和满量程测量

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摘要

This paper presents a study on wind flow in the passage between the walls of a bell tower. The bell tower, raised above the church roof, consisted of two walls with the horizontal angle between them equal to 100 degrees. Computational fluid dynamics (CFD) simulations were performed for 3D models of the entire church structure. Two opposite inflow wind directions, which corresponded to diverging and converging wall layouts, were used. Amplification factors of the wind velocity along the passage were calculated. Additionally, full-scale measurements were conducted using three ultrasonic anemometers and three cup anemometers placed along the horizontal centreline of the bell tower walls. The CFD results were validated with the use of in-situ data. Wind velocity amplification or reduction observed in CFD simulations and full-scale measurements were of the same order. The biggest amplification of the wind velocity behind the passage was obtained for diverging walls, whereas the biggest reduction occurred in the front of the contraction for converging walls. The influence of geometry simplification and changes in the description of the wind flow were also analysed. Considerable differences in CFD simulations results were caused by small changes in the geometry of the model rather than by changes in the terrain category, including the roughness of the terrain.
机译：本文对钟楼两壁之间的通道中的风流进行了研究。高耸于教堂屋顶上方的钟楼由两堵墙组成，两堵墙之间的水平角等于100度。对整个教堂结构的3D模型进行了计算流体动力学（CFD）模拟。使用了两个相反的流入风向，分别对应于发散和会聚的墙面布局。计算了沿通道风速的放大系数。另外，使用三个超声波风速计和三个沿钟楼壁的中心线放置的杯形风速计进行满量程测量。通过使用原位数据验证了CFD结果。在CFD模拟和全尺寸测量中观察到的风速放大或减小幅度相同。对于发散墙，通道后的风速放大最大，而对于收缩墙，收缩最大出现在收缩的前部。还分析了几何形状简化的影响以及风流描述的变化。 CFD模拟结果的显着差异是由模型几何形状的微小变化引起的，而不是由地形类别（包括地形的粗糙度）引起的。

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