CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments
CFD analysis of cross-ventilation flow in a group of generic buildings: Comparison between steady RANS, LES and wind tunnel experiments
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DOI：
10.1007/s12273-020-0657-7
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发表时间：
2020-07-02
影响因子：
5.5
通讯作者：
Tominaga, Yoshihide
中科院分区：
文献类型：
--
作者：
Shirzadi, Mohammadreza;Mirzaei, Parham A.;Tominaga, Yoshihide
计算流体动力学（CFD）的结果所产生的稳定的雷诺平均Navier-Stokes方程（SRANS）模型和大涡模拟（LES）进行了比较，与风洞实验研究在一组通用建筑物的交叉通风流。比较了基于不同两方程湍流模型的SRANS与基于Smagorinsky亚网格湍流模型的LES的平均流场结构和湍流统计特性。LES结果显示非常接近的时间平均速度，风表面压力的预测和内部的建筑物，并通过开口的交叉流的实验结果。相反，SRANS未能预测交叉通气的最重要特征。大涡模拟较好地再现了交叉通风建筑物周围和内部的各向异性湍流特性，这与街道峡谷流动中的瞬态动量传递密切相关，并对平均流场结构产生重要影响。与此相反，SRANS不能固有地再现这种瞬态波动和各向异性的湍流特性，这导致低精度的时均速度分量，风表面压力分布和交叉气流速率的预测高达100%的误差。
Computational fluid dynamics (CFD) results generated by the steady Reynolds-averaged Navier-Stokes equations (SRANS) model and large eddy simulation (LES) are compared with wind tunnel experiments for investigating a cross-ventilation flow in a group of generic buildings. The mean flow structure and turbulence statistics are compared for SRANS based on different two-equation turbulence models with LES based on the Smagorinsky subgrid-scale turbulence model. The LES results show very close agreement with the experimental results in the prediction of the time-averaged velocity, wind surface pressure around and inside the building, and crossing flow through the openings. In contrast, SRANS fails to predict the most important features of cross-ventilation. LES reproduces well the anisotropic turbulence property around and inside the cross-ventilated building, which is closely related to the transient momentum transfer caused in street canyon flows and has a significant influence on the mean flow structure. In contrast, SRANS could not inherently reproduce such transient fluctuations and anisotropic turbulence property, which results in low accurate predictions for the time-averaged velocity components, wind surface pressure distribution and crossing airflow rate up to 100% error.