Studies on Environmental Turbent Flows

环境湍流研究

• 批准号: 9523249
• 负责人: Harindra Joseph Fernando
• 金额: $ 27.96万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-04-15 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9523249&HistoricalAwards=false
• 关键词: Studies; Environmental; Turbent; Flows

CTS-9523249 Fernando This work will be a laboratory study, augmented by theoretical analysis, of turbulent flows that are of interest to environmental and climatic forecasting. Specifically the proposed work addresses two processes that are vital for the understanding of small-scale phenomena in oceans and the atmosphere. The processes identified for study are: a) the sinking of negatively buoyant fluid masses in the presence of background stratification and mean shear and b) the entrainment at the base of a turbulent mixing layer in the presence of vertical velocity gradients. The first study has application to the generation of strong gusts and horizontal wind shears close to the ground. A better understanding of these phenomena is paramount to aviation safety. The second study is aimed at improving the mixing parameterizations of mixed layer models. These models are in use for short term forecasting.

CTS-9523249费尔南多这项工作将是对环境和气候预报感兴趣的湍流的实验室研究，并辅之以理论分析。具体而言，拟议的工作涉及对理解海洋和大气中的小范围现象至关重要的两个过程。确定要研究的过程是：a)在存在背景层结和平均切变的情况下，负浮力流体团下沉；b)在存在垂直速度梯度的情况下，湍流混合层底部的卷吸作用。第一项研究适用于强阵风和地面附近水平风切变的产生。更好地了解这些现象对航空安全至关重要。第二个研究旨在改进混合层模式的混合参数。这些模型用于短期预测。