Predictability of Turbulent Flow in Street Canyons
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- 作者：K. W. Lo ; K. Ngan
- 关键词：Predictability ; Street canyons ; Turbulence
- 刊名：Boundary-Layer Meteorology
- 出版年：2015
- 出版时间：August 2015
- 年：2015
- 卷：156
- 期：2
- 页码：191-210
- 全文大小：3,178 KB
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K. Ngan (2)
1. School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong
2. Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Meteorology and Climatology
Atmospheric Protection, Air Quality Control and Air Pollution - 出版者：Springer Netherlands
- ISSN：1573-1472
文摘
Although predictability is a subject of great importance in atmospheric modelling, there has been little research on urban boundary-layer flows. Here the predictability of street-canyon flow is examined numerically via large-eddy simulation of a unit-aspect-ratio canyon and neutrally stratified atmosphere. In spectral space there is indication of cascade-like behaviour away from the canyon at early times, but the error growth is essentially independent of scale inside the canyon; in physical space the error field is rather inhomogeneous and shows clear differences among the canyon, shear layer and inertial sublayer. The error growth is largely driven by the shear layer: errors generated above roof level are advected into the canyon while contributions from intermittent bursting and in situ development within the canyon play a relatively minor role. This work highlights differences between the predictability of urban flows and canonical turbulent flows and should be useful in developing modelling strategies for more realistic time-dependent urban flows.