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首页> 外文期刊>Boundary-Layer Meteorology >A Dynamic Urban Canopy Parameterization for Mesoscale Models Based on Computational Fluid Dynamics Reynolds-Averaged Navier–Stokes Microscale Simulations
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A Dynamic Urban Canopy Parameterization for Mesoscale Models Based on Computational Fluid Dynamics Reynolds-Averaged Navier–Stokes Microscale Simulations

机译：基于计算流体动力学雷诺数平均Navier-Stokes微观模拟的中尺度模型动态城市冠层参数化

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摘要

Urban canopy parameterizations (UCPs) are necessary in mesoscale modelling to take into account the effects of buildings on wind and turbulent structures. This study is focused on the dynamical part of UCPs. The main objective is twofold: first, computing important UCP input parameters (turbulent length scales and the sectional drag coefficient) by means of Reynolds-averaged Navier–Stokes (RANS) simulations of turbulent flow; and second, comparing UCP variables with spatially-averaged properties obtained from RANS simulations for the same configurations. The results show the importance of using a suitable parameterization of the drag force for different packing densities. An urban canopy parameterization that is a compromise between simplicity and accuracy is proposed. This scheme accounts for the variation of drag coefficients with packing densities, and has a parameterization of turbulent length scales. The technique adopted ensures that, at least for the simple configurations studied, the urban canopy parameterization gives values of spatially-averaged variables similar to those computed from a more complex simulation, such as RANS that resolves explicitly the flow around buildings.
机译：中尺度建模中必须考虑城市冠层参数化（UCP），以考虑建筑物对风和湍流结构的影响。这项研究的重点是UCP的动态部分。主要目标是双重的：首先，通过湍流的雷诺平均Navier-Stokes（RANS）模拟来计算重要的UCP输入参数（湍流长度尺度和截面阻力系数）；其次，将UCP变量与从RANS仿真获得的相同配置的空间平均属性进行比较。结果表明，对于不同的堆积密度，使用合适的阻力参数设置非常重要。提出了一种在简单性和准确性之间折衷的城市雨棚参数化方法。该方案考虑了阻力系数随堆积密度的变化，并具有湍流尺度的参数化。所采用的技术可确保至少对于所研究的简单配置而言，城市冠层参数化提供的空间平均变量值类似于通过更复杂的模拟（例如RANS）明确计算出的建筑物周围流动所计算出的值。

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