Abstract

The separation zones resulting from the wind interaction with a building and its immediate surroundings are of great importance for determination of multiple vortex systems interacting with the building and for consideration of appropriate design parameters. In this study, flow structures around building models having dimensions of 5 × 5 × 5 cm (Model B), 5 × 5 × 10 cm (Model C), and 5 × 10 × 5 cm (Model D) with a 30° slope and rooftop were examined experimentally with a distance of 13.75 cm between two models (Model B and C; Model C and D) with the use of Particle Image Velocimetry (PIV). Besides, the experimental work of placing binary building was numerically researched with the use of ANSYS Fluent 16.0 software program with the k-\(\varepsilon\)turbulence model for a three-dimensional steady state, and the obtained numerical results were compared with the experimental results. Instantaneous velocity fields were firstly obtained in the experiments, and then the streamlines < \(\Psi\) >, velocity distributions < V >, and vortex peer curves < \(\omega\) > were plotted based on these data. The average equivalent velocity curve distributions in the x and y directions were also investigated for both pairs of building models. The results showed that the vortex lengths on the back of Model C increased by 13.33% as compared with Model B. The obtained result demonstrated that the geometric features had an effect on the formation of vortex separation zones. Comparison of the experimental and numerical results gave a deviation of maximum 3%.

中文翻译：

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不同二元建筑几何形状周围流动结构的实验和数值研究

摘要

由风与建筑物及其周围环境的相互作用产生的分隔区对于确定与建筑物相互作用的多个涡流系统以及考虑适当的设计参数非常重要。在这项研究中，建筑模型周围的流动结构尺寸为 5 × 5 × 5 cm（模型 B）、5 × 5 × 10 cm（模型 C）和 5 × 10 × 5 cm（模型 D），坡度为 30°使用粒子图像测速仪 (PIV) 在两个模型（模型 B 和 C；模型 C 和 D）之间的距离为 13.75 厘米的情况下对屋顶和屋顶进行了实验检查。此外，利用ANSYS Fluent 16.0软件程序，采用k -\(\varepsilon\) ，对放置二进制构建的实验工作进行了数值研究。建立了三维稳态湍流模型，并将所得数值结果与实验结果进行了比较。实验首先得到瞬时速度场，然后得到流线<  \(\Psi\)  >、速度分布<V>、涡流对等曲线<  \(\omega\) > 根据这些数据绘制。还研究了两对建筑模型在 x 和 y 方向上的平均等效速度曲线分布。结果表明，模型C背面的涡流长度比模型B增加了13.33%。得到的结果表明，几何特征对涡旋分离区的形成有影响。实验结果和数值结果的比较给出了最大 3% 的偏差。