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首页> 外文期刊>Building and Environment >Comparison of urban airflow between solar-induced thermal wall and uniform wall temperature boundary conditions by coupling CitySim and CFD
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Comparison of urban airflow between solar-induced thermal wall and uniform wall temperature boundary conditions by coupling CitySim and CFD

机译：结合CitySim和CFD比较太阳热墙和均匀墙温度边界条件下的城市空气流量

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摘要

Previous studies investigated the urban wind airflow under the isothermal condition, solar-induced thermal wall and uniform wall temperature boundary conditions. The differences in spatially-averaged airflow properties among those three boundary conditions have not been investigated yet. This study investigated different scenarios to identify: (1) whether the solar-induced non-uniform wall temperatures could be replaced by the uniform wall temperatures (average of all wall temperatures from solar-induced scenario) in the analysis of urban wind airflow and (2) the wind conditions that the wall thermal boundary conditions might be neglected. In this study, urban energy model, CitySim, was employed to calculate the solar-induced walls' temperatures of an idealized 5 x 5 building array, which were set as thermal boundary conditions in computational fluid dynamic (CFD) simulations. The simulation results were compared to those obtained from cases with uniform wall temperatures and isothermal conditions. The results showed that excluding wall thermal boundary conditions underestimated the spatially-averaged flow properties when reference wind speed (U-ref) was lower than 2.0 m s(-1) under the designed scenarios and noticeable difference of airflow pattern was observed between isothermal and non-isothermal conditions. The solar-induced wall temperature condition might be replaced by uniform wall temperature condition with U-ref of 3.0 m s(-1) under parallel wind condition, and with U ref of 5.0 m s(-1) under oblique wind conditions. Meanwhile, the airflow structures of the street canyons inside the three-dimensional building array differed significantly from the previous results obtained from isolated street canyon model.
机译：先前的研究调查了在等温条件，太阳热墙和均匀墙温边界条件下的城市风量。尚未研究这三个边界条件之间的空间平均气流特性差异。这项研究调查了各种不同的场景，以识别：（1）在分析城市风流时，是否可以用均匀的壁温（由太阳引起的场景中所有壁温的平均值）代替太阳引起的壁温不均匀和（ 2）可以忽略壁面热边界条件的风况。在这项研究中，城市能源模型CitySim被用于计算理想化5 x 5建筑阵列的日照墙温度，这些温度在计算流体力学（CFD）模拟中被设置为热边界条件。将模拟结果与从均一的壁温和等温条件下获得的结果进行比较。结果表明，在设计方案下，当参考风速（U-ref）低于2.0 ms（-1）时，排除壁面热边界条件会低估空间平均流量特性，并且等温和非等温线之间会观察到明显的气流模式差异。 -等温条件。在平行风条件下，U-ref为3.0 m s（-1），在倾斜风条件下，U ref为5.0 m s（-1），可以用均匀的壁温条件代替太阳诱导的壁温条件。同时，三维建筑物阵列内街道峡谷的气流结构与先前从孤立街道峡谷模型获得的结果有显着差异。

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