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논문 기본 정보

자료유형
학술저널
저자정보
Zhang, Ning (Department of Atmospheric Science, Nanjing University) Jiang, Weimei (Department of Atmospheric Science, Nanjing University) Hu, Fei (Key Laboratory of Atmospheric Physics and Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences)
저널정보
테크노프레스 Wind & structures Wind & structures 제7권 제3호
발행연도
2004.1
수록면
159 - 172 (14page)

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The study of how buildings affect wind flow is an important part of the research being conducted on urban climate and urban air quality. NJU-UCFM, a standard $k-{\varepsilon}$ turbulence closure model, is presented and is used to simulate how the following affect wind flow characteristics: (1) an isolated building, (2) urban canyons, (3) an irregular shaped building cluster, and (4) a real urban neighborhood. The numerical results are compared with previous researchers' results and with wind tunnel experiment results. It is demonstrated that the geometries and the distribution of urban buildings affect airflow greatly, and some examples of this include a changing of the vortices behind buildings and a "channeling effect". Although the mean air flows are well simulated by the standard $k-{\varepsilon}$ models, it is important to pay attention to certain discrepancies when results from the standard $k-{\varepsilon}$ models are used in design or policy decisions: The standard $k-{\varepsilon}$ model may overestimate the turbulence energy near the frontal side of buildings, may underestimate the range of high turbulence energy in urban areas, and may omit some important information (such as the reverse air flows above the building roofs). In ideal inflow conditions, the effects of the heights of buildings may be underestimated, when compared with field observations.

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