| 理想城市建筑群风场的大涡模拟 |
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| 引用本文： | 周玉奇,张宁.理想城市建筑群风场的大涡模拟[J].气象科学,2018,38(1):85-94. |
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| 作者姓名： | 周玉奇 张宁 |
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| 作者单位： | 南京大学 气候与全球变化研究院/大气科学学院, 南京 210023;江苏省气候变化协同创新中心, 南京 210023,南京大学 气候与全球变化研究院/大气科学学院, 南京 210023;江苏省气候变化协同创新中心, 南京 210023 |
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| 基金项目： | 国家重点研发计划（2016YFC0200501）；国家自然科学基金资助项目（41375014；51538005；41675008） |
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| 摘 要： | 为了解城市建筑群对周围风场结构的影响,本文利用大涡模拟方法对不同建筑群分布类型下的风场状况进行了模拟,并利用通风指数对风场进行定量评估。模拟结果表明:PALM(Parallelized LES model)能够反映出建筑物影响下风场的结构特征。建筑群风场受到建筑高度、高度方差、分布、初始入流的影响。风场衰减主要体现在水平分量上,尤其是平均高度较高、高度方差大、交错不规整分布使得水平方向风场衰减、通风效果变差,而同时又会使得垂直风速分量w增大,增大垂直方向的空气交换速率。初始入流不会影响风场风廓线形态,在低层风场中平均风速大小以及总体空气交换速率基本与入流成正比关系。
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| 关 键 词： | 城市建筑群 风场结构 大涡模拟 |
| 收稿时间： | 2016/9/1 0:00:00 |
| 修稿时间： | 2017/5/19 0:00:00 |
Large-eddy simulation of wind fields in idealized urban areas |
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| ZHOU Yuqi and ZHANG Ning.Large-eddy simulation of wind fields in idealized urban areas[J].Scientia Meteorologica Sinica,2018,38(1):85-94. |
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| Authors: | ZHOU Yuqi and ZHANG Ning |
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| Institution: | Institute for Climate and Global Change Research/School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China;Jiangsu Collaborative Innovation Center of Climate change, Nanjing 210023, China and Institute for Climate and Global Change Research/School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China;Jiangsu Collaborative Innovation Center of Climate change, Nanjing 210023, China |
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| Abstract: | In order to learn the influences of urban buildings on the surrounding wind fields, the wind fields of different types of buildings with the large-eddy simulation were simulated and the wind fields with various ventilation indexes were quantitatively assessed. Results show that PALM (Parallelized LES Model) can basically reflect the structures of the wind fields. Wind fields are affected by the building height, height variance and initial flow. The flow attenuation is mainly reflected in the horizontal component, especially when the average height is higher or with larger height variance and irregular distribution, the horizontal wind field would attenuate more with ventilation effect becoming worse. Meanwhile, the vertical velocity component w increases, so that the air exchange rate in the vertical direction would be larger. The initial flow does not affect the wind profile in shape, when the wind speed in lower height and the overall air exchange rate are proportional to the initial flow. |
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| Keywords: | Urban buildings Wind fields structure Large-eddy simulation |
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