Subgrid-scale (SGS) 2000: Analysis of Field Experimental Data to Elucidate Fundamental Physics in Parameterizations for Large-eddy Simulations

次网格尺度 (SGS) 2000：分析现场实验数据以阐明大涡模拟参数化中的基础物理

• 批准号: 0130766
• 负责人: Charles Meneveau
• 金额: $ 37.55万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0130766&HistoricalAwards=false
• 关键词: Subgrid; scale; SGS; 2000; Analysis

Large-eddy simulation (LES) is increasingly used to analyze land-atmosphere interactions at scales relevant to microscale and mesoscale meteorology. The goal of this project is to improve the understanding of subgrid-scale (SGS) motions - the turbulent velocity fluctuations too small to be resolved in LES models, which must be accounted for by some kind of parameterization. The approach is to use experimental data collected in the SGS2000 experiment, conducted in the summer of 2000 in the San Joaquin Valley. The analysis will employ novel ideas that have arisen from laboratory studies of turbulence. These include new statistical-geometrical tools to quantify alignments between SGS heat flux and temperature gradient vectors, the evaluation of spectral eddy viscosities and eddy diffusivities from the data, and the study of coherent structures such as sweeps and ejections. To extend the range of the scales that can be analyzed, a new field experiment will be planned that combines an array of hot-wire anemometers to measure the fine scales of turbulence with arrays of sonic anemometers to measure the larger scales. Details of the experiment design will depend on the outcome of the analysis of SGS2000 data. The field program will be undertaken in collaboration with the Atmospheric Technology and the Microscale and Mesoscale Meteorology Divisions of the National Center for Atmospheric Research.

大涡模拟（LES）越来越多地用于分析与微尺度和中尺度气象学相关的陆地-大气相互作用。 该项目的目标是提高对亚网格尺度 (SGS) 运动的理解 - 湍流速度波动太小而无法在 LES 模型中解决，必须通过某种参数化来解释。 该方法是使用 2000 年夏天在圣华金河谷进行的 SGS2000 实验中收集的实验数据。 该分析将采用来自湍流实验室研究的新颖想法。 其中包括用于量化 SGS 热通量和温度梯度矢量之间对齐的新统计几何工具、根据数据评估光谱涡流粘度和涡流扩散率以及对相干结构（例如扫描和喷射）的研究。 为了扩大可分析的尺度范围，将计划进行一项新的现场实验，该实验将热线风速计阵列与声波风速计阵列结合起来，以测量湍流的精细尺度，以测量更大的尺度。 实验设计的细节将取决于SGS2000数据的分析结果。 该实地计划将与国家大气研究中心的大气技术部以及微尺度和中尺度气象部门合作进行。