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首页> 外文期刊>Climatic Change >Numerical Study of Dual-Plume Interference in a Turbulent Boundary Layer
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Numerical Study of Dual-Plume Interference in a Turbulent Boundary Layer

机译：湍流边界层双羽流干扰的数值研究

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Direct numerical simulation is used to investigate the interference arising from the dispersion of passive scalar plumes released from a pair of point sources in a fully-developed wall-bounded shear flow. Four different lateral separations of the two sources for both near ground-level and elevated releases are considered. The downwind evolution of the correlation between the plume concentrations along the centreline between the two sources and the behaviour of the lateral profiles of the correlation at various locations downwind of the two sources are examined in detail. Differences in the exceedance probability over a high concentration level for a single plume and the total plume are highlighted and studied, and the effects of destructive and constructive interferences on the exceedance probabilities for the total plume are used to explain these differences. One significant result is that all higher-order (third-order and above) moments of the total concentration can be inferred from the application of a clipped-gamma distribution using the information embodied in only the first- and second-order concentration moments of each single plume, and in the cross-correlation coefficient of the instantaneous concentration of the two plumes.
机译：直接数值模拟用于研究由从一对点源释放的被动标量羽毛的分散在完全开发的壁界剪切流程中产生的干扰。考虑两个近地层和升高释放的两个来源的四种不同的横向分离。详细地检查了两个来源与两个源在两个源的各个位置处的相关位置之间的中心线之间的羽流浓度之间的相关性的顺风浓度与横向谱之间的相关性。突出显示和研究了高浓度水平和总羽流的高浓度水平的差异，并研究了对总羽流的影响概率的影响和建设性干扰的影响用于解释这些差异。一个显着的结果是，使用仅在每个第二阶和二阶集中时刻所体现的信息，可以从夹克-Gamma分布的应用中推断出总浓度的所有高阶（三阶及以上）的瞬间单个羽流，以及两个羽羽的瞬时浓度的互相关系数。

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