基于CFD技术的河谷型城市风环境模拟——以兰州市城关区为例

doi:10.7522/j.issn.1000-694X.2013.00244

摘要/Abstract

摘要：

本文应用CFD软件对多种流场的强大模拟功能,模拟小尺度的兰州市城关区风环境。选用SRTM资料表征兰州市城关区的地形,应用ArcGIS生成兰州市地形模型,计算相关参数,将计算得到的地形粗糙度和兰州多年气候资料转化为CFD模型的数字参数及模拟边界条件等,首次模拟得到河谷型地区兰州城关区的风环境。结果表明:（1）河谷型地区中,气流过山时风速达最大值,依山体高度增大,而在背风坡风速值明显降低,达到0～1 m·s-1;（2）气流过境时在沿河谷前进,且在谷底风速值达0～1 m·s-1;（3）在模拟城市热岛效应的对比实验中,地块加热对气流过境有停滞作用。

关键词: CFD, 河谷型城市, 风环境, 热岛效应

Abstract:

In this paper, Computational fluid dynamic(CFD) software was used to simulate the wind environment in Chengguan District of Lanzhou. SRTM topographic data for the Chengguan District of Lanzhou, were generated by application of ArcGIS software to solve this problem. The roughness of the terrain of the studied area was calculated from ArcGIS, and climate data were converted into digital parameters and the CFD model boundary conditions, and wind environment of the studied area was simulated for the first time. The results showed that: (1) The wind speed of the airflow over the mountains in the valley areas reached maximum. When mountain height increased, the wind speed values increased. But it decreased significantly in Leeward, reaching 0-1 m·s-1; (2) Air transited forward along the valley, and wind speed reached 0-1 m·s-1 at the valley bottom; (3) The simulation experiments of the urban heat island effect indicated airflow transit was stagnated by lot heated.

Key words: computational fluid dynamic, valley cities, wind environment, heat island effect

中图分类号:

P425

刘丽珺, 吕萍, 梁友嘉. 基于CFD技术的河谷型城市风环境模拟——以兰州市城关区为例[J]. 中国沙漠, 2013, 33(6): 1840-1847.

LIU Li-jun, L Ping, LIANG You-jia. Simulating Wind Environment of Valley City Based on CFD Technology: A case study of Chengguan District of Lanzhou, China[J]. JOURNAL OF DESERT RESEARCH, 2013, 33(6): 1840-1847.

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