Theoretical studies of eddy mixing

涡流混合的理论研究

• 批准号: 1459702
• 负责人: Glenn Flierl
• 金额: $ 35.14万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-03-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1459702&HistoricalAwards=false
• 关键词: Theoretical; studies; eddy; mixing

The overall goal of this study is to understand how material is transported by fluctuating motions in the ocean and the atmosphere. The project involves creating a number of models which can be run in real-time and can be used to illustrate visually the distinction between stirring and diffusion and the rapidity by which both together can homogenize a tracer. The approach can help in the understanding of the importance of eddies and weather systems in determining the transports and distributions of pollutants, components of ecosystems, heat, and ozone. The models will be made available on the web as well as in an interactive textbook on numerical fluid mechanics. The project includes training of a graduate student.This project will investigate eddy mixing processes using idealized flow models for which the diffusion can be precisely controlled. The specific aims of the study are to contribute to improved understanding of: (1) the ways in which fluxes are non-local (i.e., depend on more than just the value of the gradients of the mean at the point of interest), (2) the effects of inhomogeneities both in the means (where the non-local nature of stirring comes into play) and in the eddy properties, and (3) how fluxes for reacting fields such as biogeochemical variables differ from passive tracers. Simulations together with analytical methods will be used to gain a deeper insight into the processes acting and the interplay among them.

这项研究的总体目标是了解物质是如何通过海洋和大气中的波动运动进行运输的。 该项目涉及创建一些模型，这些模型可以实时运行，并可用于直观地说明搅拌和扩散之间的区别，以及两者共同使示踪剂均匀化的速度。这种方法可以帮助理解涡流和天气系统在确定污染物、生态系统组成部分、热量和臭氧的输送和分布方面的重要性。这些模型将在网上提供，并编入关于数值流体力学的互动教科书。 该项目包括一名研究生的培训。该项目将使用理想化的流动模型来研究涡流混合过程，从而可以精确控制扩散。本研究的具体目的是有助于更好地理解：（1）通量是非局部的方式（即，不仅取决于感兴趣点处的平均梯度值），（2）平均值（搅拌的非局部性质起作用）和涡流性质中的不均匀性的影响，以及（3）反应场（如地球化学变量）的通量如何不同于被动示踪剂。模拟与分析方法将用于更深入地了解过程的作用和它们之间的相互作用。