Abstract After the summer 2015 chlorine releases during the Jack Rabbit II field experiment at Dugway Proving Ground, a special sonic anemometer study was carried out in October 2015 and March 2016. The goal was to provide documented wind fields in similar conditions to the actual releases and to study building wakes without risk for the instruments. This study included 30 sonic anemometers that were placed around these “buildings” to best capture the recirculating regions. Building wakes are important for the dispersion of pollutants in cities and around industrial plants and therefore we have selected two time periods during March 2016, in order to present model to model and model to data comparisons. There are four models involved in the comparison ranging from a diagnostic wind model with wake parameterization and Lagrangian particle dispersion and a CFD model with a k-e turbulence closure and solving the Eulerian dispersion equation. Detailed comparisons are carried out for the wind speed and for the turbulence level. Six virtual releases are added in the simulations to investigate how the wake resolving method can affect the dispersion. For the wind speed comparison, the models give fair to good comparison with the sonic measurements. However, for the turbulence comparison the results clearly show a need for improvement, even for the k-e closure, which still provides the best results. For the concentrations, for which there is no corresponding measurements, we find that the simulations are much closer than for the turbulence comparison.

中文翻译：

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JRII 特殊声波风速计研究：建筑物尾流测量与不同级别的数值建模方法的首次比较

摘要 2015 年夏季达格威试验场 Jack Rabbit II 野外试验期间氯气释放后，2015 年 10 月和 2016 年 3 月进行了一项特殊的声速计研究。研究在没有仪器风险的情况下建立尾流。这项研究包括放置在这些“建筑物”周围的 30 个声波风速计，以最好地捕捉再循环区域。建筑尾流对于污染物在城市和工厂周围的扩散很重要，因此我们选择了 2016 年 3 月的两个时间段，以呈现模型到模型和模型到数据的比较。比较涉及四种模型，包括带有尾流参数化和拉格朗日粒子色散的诊断风模型，以及带有 ke 湍流闭合和求解欧拉色散方程的 CFD 模型。对风速和湍流水平进行了详细比较。模拟中添加了六个虚拟释放，以研究尾流解析方法如何影响色散。对于风速比较，这些模型与声波测量值进行了比较。然而，对于湍流比较，结果清楚地表明需要改进，即使对于仍然提供最佳结果的 ke 闭合也是如此。对于没有相应测量值的浓度，我们发现模拟比湍流比较更接近。