Computational fluid dynamics for cross‐ventilated airflow in an urban building
Computational fluid dynamics for cross‐ventilated airflow in an urban building
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城市建筑交叉通风气流的计算流体动力学
DOI：
10.1002/2475-8876.12312
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发表时间：
2022
影响因子：
0.9
通讯作者：
Tanimoto Jun
中科院分区：
文献类型：
--
作者：
Hirose Chiyoko;Ikegaya Naoki;Hagishima Aya;Tanimoto Jun
在这项研究中，在一个自然通风的建筑物内的一个类似城市的阵列的速度场进行了探索，使用大涡模拟。使用缩小比例的建筑物模型来检查周围建筑物和交叉通风窗的几何条件对遮蔽建筑物中的流量统计和瞬时速度场的影响。针对建筑物阵列和开口的每种情况，计算了开口区域平均的瞬时速度分量。结果表明，周围城市的几何形状显着影响湍流开放速度。此外，目标建筑物内的三维瞬时速度分布清楚地表明，在不同的建筑物和开放条件下存在相当大的差异。这种差异还会影响室内区域的平均风速、最大风速和最小风速。此外，还比较了每种情况下两点相关系数的分布（由迎风开口中心和建筑物内部垂直于窗户的速度定义）。两个开口附近的强相关性表明，由周围建筑物产生的瞬时速度是决定室内通风气流的统计和瞬时特性的重要因素。
In this study, the velocity field in a naturally ventilated building within an urban‐like array was explored using large‐eddy simulations. Reduced‐scale building models were used to examine the impacts of the geometric conditions in the surrounding buildings and cross‐ventilating windows on the flow statistics and instantaneous velocity fields in the sheltered building. The instantaneous velocity components averaged in the opening area were calculated for each condition of the building arrays and openings. The results indicate that the surrounding urban geometry significantly affects the turbulent opening velocities. Additionally, the three‐dimensional instantaneous velocity distributions within the target building clearly demonstrate considerable differences under the different building and opening conditions. Such differences also affect the mean, maximum, and minimum wind speeds within the indoor regions. Moreover, the distributions of the two‐point correlation coefficient (defined by the velocities normal to the windows at the center of the windward opening and inside the building) were compared for each condition. The strong correlations near the two openings indicate that the instantaneous velocity generated by the surrounding buildings is an important factor in determining the statistical and instantaneous features of indoor ventilating airflows.