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Numerical Analysis of the Atmospheric Boundary-Layer Turbulence Influence on Microscale Transport of Pollutant in an Idealized Urban Environment
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2022-03-28 , DOI: 10.1007/s10546-022-00697-7
Tim Nagel , Robert Schoetter , Valéry Masson , Christine Lac , Bertrand Carissimo

The mesoscale atmospheric model Meso-NH is used to investigate the influence of mesoscale atmospheric turbulence on the mean flow, turbulence, and pollutant dispersion in an idealized urban-like environment, the array of containers investigated during the Mock Urban Setting Test field experiment. First, large-eddy simulations are performed as in typical computational fluid dynamics-like configurations, i.e., without accounting for the atmospheric- boundary-layer (ABL) turbulence on scales larger than the building scale. Second, in a multiscale configuration, turbulence of all scales prevailing in the ABL is accounted for by using the grid-nesting approach to downscale from the mesoscale to the microscale. The building-like obstacles are represented using the immersed boundary method and a new turbulence recycling method is used to enhance the turbulence transition between two nested domains. Upstream of the container array, flow characteristics such as wind speed, direction and turbulence kinetic energy are well reproduced with the multiscale configuration, showing the efficiency of the grid-nesting approach in combination with turbulence recycling for downscaling from the mesoscale to the microscale. Only the multiscale configuration is able to reproduce the mesoscale turbulent structures crossing the container array. The accuracy of the numerical results is evaluated for wind speed, wind direction, and pollutant concentration. The microscale numerical simulation of wind speed and pollutant dispersion in an urban-like environment benefits from taking into account the ABL turbulence. However, this benefit is significantly less important than that described in the literature for the Oklahoma City Joint Urban 2003 real case. The present study highlights that pollutant dispersion simulation improvement when accounting for ABL turbulence is dependent on the specific configuration of the city.



中文翻译:

理想化城市环境中大气边界层湍流对污染物微尺度迁移影响的数值分析

中尺度大气模型 Meso-NH 用于研究中尺度大气湍流对理想城市环境中的平均流量、湍流和污染物扩散的影响,这是在模拟城市环境测试现场实验期间研究的容器阵列。首先,大涡模拟按照典型的计算流体动力学配置进行,即不考虑比建筑规模更大的大气边界层(ABL)湍流。其次,在多尺度配置中,ABL 中普遍存在的所有尺度的湍流都是通过使用网格嵌套方法从中尺度缩小到微尺度来解释的。使用浸没边界法表示建筑物状障碍物,并使用一种新的湍流循环方法来增强两个嵌套域之间的湍流过渡。在容器阵列的上游,多尺度配置很好地再现了风速、方向和湍流动能等流动特性,显示了网格嵌套方法与湍流回收相结合的效率,可将尺度从中尺度缩小到微尺度。只有多尺度配置才能再现穿过容器阵列的中尺度湍流结构。针对风速、风向和污染物浓度评估数值结果的准确性。考虑到 ABL 湍流,在类似城市的环境中对风速和污染物扩散进行微尺度数值模拟。然而,这一好处远没有俄克拉荷马城联合城市 2003 年真实案例的文献中描述的那么重要。本研究强调,在考虑 ABL 湍流时,污染物扩散模拟的改进取决于城市的具体配置。

更新日期:2022-03-28
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