Abstract

Recent studies have highlighted the importance of accurate meteorological conditions for urban transport and dispersion calculations. In this work, we present a novel scheme to compute the meteorological input in the Quick Urban & Industrial Complex (QUIC) diagnostic urban wind solver to improve the characterization of upstream wind veer and shear in the Atmospheric Boundary Layer (ABL). The new formulation is based on a coupled set of Ordinary Differential Equations (ODEs) derived from the Reynolds Averaged Navier–Stokes (RANS) equations, and is fast to compute. Building upon recent progress in modeling the idealized ABL, we include effects from surface roughness, turbulent stress, Coriolis force, buoyancy and baroclinicity. We verify the performance of the new scheme with canonical Large Eddy Simulation (LES) tests with the GPU-accelerated FastEddy solver in neutral, stable, unstable and baroclinic conditions with different surface roughness. Furthermore, we evaluate QUIC calculations with and without the new inflow scheme with real data from the Urban Threat Dispersion (UTD) field experiment, which includes Lidar-based wind measurements as well as concentration observations from multiple outdoor releases of a non-reactive tracer in downtown New York City. Compared to previous inflow capabilities that were limited to a constant wind direction with height, we show that the new scheme can model wind veer in the ABL and enhance the prediction of the surface cross-isobaric angle, improving evaluation statistics of simulated concentrations paired in time and space with UTD measurements.

中文翻译：

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QUIC 建模系统一维边界层流入方案的制定、实施和验证

摘要

最近的研究强调了准确的气象条件对于城市交通和扩散计算的重要性。在这项工作中，我们提出了一种新颖的方案来计算快速城市与工业综合体（ QUIC ）诊断城市风求解器中的气象输入，以改善大气边界层（ABL）中上游风转向和切变的表征。新公式基于从雷诺平均纳维斯托克斯 (RANS) 方程导出的一组耦合常微分方程 (ODE)，计算速度很快。基于理想化 ABL 建模的最新进展，我们考虑了表面粗糙度、湍流应力、科里奥利力、浮力和斜压的影响。我们通过 GPU 加速的 FastEddy 解算器在不同表面粗糙度的中性、稳定、不稳定和斜压条件下通过规范大涡模拟 (LES) 测试验证了新方案的性能。此外，我们还使用来自城市威胁扩散 (UTD) 现场实验的真实数据评估了使用和不使用新流入方案的 QUIC 计算，其中包括基于激光雷达的风测量以及非反应示踪剂多次室外释放的浓度观测。纽约市中心。与之前仅限于恒定风向和高度的流入能力相比，我们表明新方案可以对ABL中的风转向进行建模，并增强对地表交叉等压角的预测，从而改善对时间配对的模拟浓度的评估统计和 UTD 测量的空间。