Experimental validation of a computational fluid dynamics code to predict the wind speed in street canyons for passive cooling purposes
Experimental validation of a computational fluid dynamics code to predict the wind speed in street canyons for passive cooling purposes
复制标题
用于预测街道峡谷风速以实现被动冷却目的的计算流体动力学代码的实验验证
DOI：
10.1016/j.solener.2005.07.007
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发表时间：
2006
期刊：
影响因子：
6.7
通讯作者：
M. Santamouris
中科院分区：
文献类型：
--
作者：
V. Assimakopoulos;C. Georgakis;M. Santamouris
自然通风是最有效的建筑被动冷却技术之一。街道峡谷中风速的知识是在密集的城市配置中应用这种技术的必要条件。因此，预测技术来评估街道峡谷的小气候和扩散参数，已成为近年来激烈的科学研究的主题。在大多数情况下，风的流动和污染物的扩散特性进行了数值和实验研究，以期提供一个洞察城市扩散。微尺度模型MIMO是为了执行三维建模的风场在三个典型的深街道峡谷，位于雅典市中心。计算结果进行了比较，在连续三天的实验活动，发生在夏季期间收集的现场数据。计算结果表明，城市地区的风场相当复杂，存在风速很低的区域和涡的辐合。该模型低估了测得的风速强度，这可能部分是由于特定输入参数的不确定性，这种模型的应用程序的必要简化，最后模拟区域的几何复杂性。最后，对被认为是阈值的2 m/s的参考速度进行了计算。发展的风场偏离了在以前的情况下观察到的风场。
Natural ventilation is one of the most efficient passive cooling techniques for buildings. Knowledge of the wind speed in street canyons is the necessary condition for the application of such a technique in dense urban configurations. Thus, prediction techniques to evaluate the microclimate and dispersion parameters in street canyons, has become a subject of intense scientific research in recent years. In most of cases, wind flow and pollutant dispersion characteristics have been studied numerically and experimentally with a view to provide an insight in urban dispersion. The microscale model MIMO was employed in order to perform a three-dimensional modelling of the wind field within three typical deep street canyons, located in the centre of Athens. Computational results were compared to field data collected during consecutive three-day experimental campaigns that took place in the summer period. Results from the computations have shown that the wind field in urban areas is quite complex, presenting areas of very low wind speeds and convergence of vortices. The model underestimated the measured wind speed intensities, which may be partly explained by the uncertainty of specific input parameters, the necessary simplifications for the application of such models and finally the geometrical complexity of the area modelled. Finally, computations were performed for a reference velocity of 2m/s, which is considered to be a threshold value. The wind field developed departed from the one observed in the previous cases.