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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Numerical and Wind Tunnel Simulation Studies of the Flow Field and Pollutant Diffusion around a Building under Neutral and Stable Atmospheric Stratifications
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Numerical and Wind Tunnel Simulation Studies of the Flow Field and Pollutant Diffusion around a Building under Neutral and Stable Atmospheric Stratifications

机译：中性稳定大气分层围绕建筑物流域和污染物扩散的数值和风洞仿真研究

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摘要

In this paper, the k-epsilon renormalization group (RNG) turbulence model is used to simulate the flow and dispersion of pollutants emitted from a source at the top of a cubic building under neutral and stable atmospheric stratifications, the results of which were compared with corresponding wind tunnel experiment results. When atmosphere stratification is stable, the separation zones on the sides and at the top of a building are relatively smaller than those under neutral conditions, and the effect of the building in the horizontal direction is stronger than that in the vertical direction. The variation in turbulent kinetic energy under stable conditions is significantly lower than that under neutral conditions. The effect of atmospheric stratification on the turbulent kinetic energy becomes gradually more prominent with increased distance. When atmosphere conditions are stable, the vertical distribution of the plume is smaller than that of neutral conditions, but the lateral spread and near-ground concentration are slightly larger than those of neutral conditions, mainly because stable atmospheric stratification suppresses the vertical motions of airflow and increases the horizontal spread of the plume.
机译：在本文中，K-epsilon重生组（RNG）湍流模型用于模拟中性和稳定的大气分层顶部源自源自立方体建筑物顶部的污染物的流动和分散，其结果与相应的风洞实验结果。当大气分层稳定时，建筑物顶部和在建筑物顶部的分离区比中立条件下的分离区相对小，并且建筑物在水平方向上的效果比垂直方向的效果更强。稳定条件下湍流动能的变化显着低于中性条件下的变化。大气分层对湍流动能的影响随着距离而逐渐突出。当大气条件稳定时，羽流的垂直分布小于中性条件的垂直分布，但横向扩散和近地浓度略大于中性条件，主要是因为稳定的大气分层抑制了气流的垂直运动和增加羽流的水平扩散。

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