Abstract: The dynamic sub model ARPS is improved to simulate the flow field over two-dimensional street canyons. An energy budget sub model coupled with the modified ARPS is developed to compute the thermal structure. The dynamic sub model is capable of describing those characteristic flows around the buildings, including vortices between buildings and lee vortices, etc., while the coupling model can be used to simulate the diurnal variations of energy budget of different facades and temperature. These cases studies indicate that the above model systems can be used for investigating the wind and thermal environment and the processes of air pollutant transportation and diffusion over a street canyon or a group of buildings.

Key words: urban street canyon, flow field, temperature field, numerical simulation

摘要： 采用改进的ARPS动力模式模拟城市街谷流场，应用动力和能量平衡耦合模式模拟街谷温度场日变化过程。该动力模式能够模拟建筑物周围典型流场，包括街谷涡旋及背风区尾流涡旋等。耦合模式能够模拟街谷各接收面能量收支及温度场日变化过程。计算实例表明，上述模式系统可用于城市街谷和建筑群风环境和热力环境的研究，也可用于对街谷中空气污染物传输和扩散的计算。

关键词: 城市街谷, 流场, 温度场, 数值模拟