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首页> 外文期刊>Journal of building performance simulation >Large eddy simulation of thermal stratification effect on convective and turbulent diffusion fluxes concerning gaseous pollutant dispersion around a high-rise model building
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Large eddy simulation of thermal stratification effect on convective and turbulent diffusion fluxes concerning gaseous pollutant dispersion around a high-rise model building

机译：高层模型建筑物周围热对流对流和湍流扩散通量的大涡模拟，涉及对流污染物扩散

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In this paper, the large eddy simulation (LES) approach is employed to investigate the role of different thermal stratification conditions (stable, neutral and unstable) in the air flow and gaseous pollutant dispersion processes around a high-rise non-isolated model building with 1:1:2 shape placed within a non-isothermal boundary layer. The simulation results are initially validated with available experimental measurements and then applied to study the characteristics of pollutant dispersion. Predictions show a low-velocity zone behind the model building. The major effect of a stable stratification on flow field is the formation of a weak recirculation flow in the wake region. Results represent an intense temperature gradient close to the sides of the model building for both stable and unstable conditions. Moreover, the convective and turbulent diffusion fluxes are compared under different thermal stratification conditions, and it is shown that the LES approach is capable of predicting the counter-gradient mechanism.
机译：在本文中，采用大涡模拟（LES）方法来研究不同的热分层条件（稳定，中性和不稳定）在高层非隔离模型建筑物周围气流和气态污染物扩散过程中的作用。 1：1：2形状放置在非等温边界层中。首先使用可用的实验测量对模拟结果进行验证，然后将其用于研究污染物扩散的特性。预测显示模型建筑物后面有一个低速区域。稳定分层对流场的主要影响是在尾流区形成弱的再循环流。结果表示在稳定和不稳定条件下，靠近模型建筑物侧面的剧烈温度梯度。此外，比较了在不同热分层条件下的对流和湍流扩散通量，结果表明，LES方法能够预测反梯度机制。

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