Models for Large-Eddy Simulation in the Atmospheric Boundary-Layer

大气边界层大涡模拟模型

• 批准号: 1001262
• 负责人: Robert Street
• 金额: $ 22.46万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1001262&HistoricalAwards=false
• 关键词: Models; Large; Eddy; Simulation; Atmospheric

Large-eddy simulation (LES) is widely used to replicate atmospheric and other flow behavior for many purposes, such as1) Prediction of flows in complex topography,2) Transport and diffusion of pollutants,3) Convective energy flux estimation.This research will concentrate on developing a state-of-the-art tool for the LES of atmospheric boundary-layer flow over complex terrain based on Reynolds-averaged Navier-Stokes equations. Intellectual merit: Simulating flow within a sufficiently large region in Owens Valley, CA with adequate grid resolution will exploit the benefits of the complete subgrid-scale and subfilter-scale turbulence scheme. A new land surface characterization tool to provide better treatment of land surface processes at fine resolution over complex terrain will also be incorporated. Comparison of simulation results with relevant parts of the extensive Terrain-induced Rotor EXperiment (T-REX) dataset will test the realism of the turbulence models and the tiled-land-surface treatment. Specifically, the effects of small-scale variations in surface properties on fluxes and flow dynamics will be assessed. These newly combined modules should provide an improved state-of-the-art tool for atmospheric boundary-layer LES.Broader impacts: This research will demonstrate that the LES code is suitable for studying the development of atmospheric flow structures, and for sensitivity studies of the effects of grid resolution and land surface treatment on the fluxes and flows of the atmospheric boundary-layer. The results will also be useful for developing parameterizations for numerical simulation at regional to global scales. Improved LES techniques can have wide impacts wherever LES techniques are applied. A Ph.D. student will be trained in the subject area.

大涡模拟(LES)被广泛用于模拟复杂地形中的大气和其他流动行为，如1)复杂地形中的流动预测，2)污染物的传输和扩散，3)对流能量通量的估计。本研究将致力于开发一个基于雷诺平均的N-S方程的复杂地形上大气边界层流动的大涡模拟工具。智能优点：用足够的网格分辨率模拟加利福尼亚州欧文斯山谷足够大的区域内的流动，将利用完整的亚网格尺度和亚过滤尺度湍流方案的好处。还将采用一种新的陆面表征工具，以便在复杂地形上以精细分辨率更好地处理陆面过程。将模拟结果与大规模地形诱导旋翼实验(T-REX)数据集的相关部分进行比较，将检验湍流模型和平铺地面处理的真实性。具体地说，将评估表面性质的小范围变化对通量和流动动力学的影响。这些新组合的模块将为大气边界层LES提供一种改进的先进工具。布罗德影响：这项研究将证明LES程序适用于研究大气流动结构的发展，并适用于网格分辨率和地面处理对大气边界层通量和流动影响的敏感性研究。这些结果也将有助于开发用于区域到全球尺度的数值模拟的参数化。无论在哪里应用LES技术，改进的LES技术都可以产生广泛的影响。一名博士生将接受该学科领域的培训。