Turbulent transport in anisotropic velocity fields

各向异性速度场中的湍流传输

• 批准号: 0651180
• 负责人: Dimitrios Papavassiliou
• 金额: --
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0651180&HistoricalAwards=false
• 关键词: Turbulent; transport; anisotropic; velocity; fields

Intellectual Merit: The overall goal of the proposed research is to explore the fundamental mechanism of turbulent heat transfer in the case of anisotropic turbulence. The specific objectives for the duration of the project are to: (a) investigate the physical mechanisms for turbulent transport close to a solid boundary (in the viscous wall region and in the logarithmic layer); (b) determine the Prandtl number effects on turbulent transport properties (e.g., on the turbulent Prandtl number and on the Nusselt number); (c) develop algorithms for the simulation of coupled heat and fluid flow and for chemically reacting turbulent flows. The proposed approach is to use hydrodynamics generated by direct numerical simulations to generate Lagrangian data for turbulent dispersion. This Lagrangian approach allows to investigate fluids of practical interest but different properties (e.g., liquid metals, gases, refrigerants, electrochemical fluids), and to investigate cases where conventional numerical methods are often not feasible with the current capabilities of supercomputers.Broader Impact of the Proposed Activities: The findings of this research will be significant for the theory of turbulent transport as well as for industrial and environmental applications, in which modeling turbulent transport is important (e.g., design of chemical reactors, design of heat exchangers for different Prandtl number fluids, prediction and control of pollutant dispersion, heat transfer over moving blades).Aspects of the proposed research project will be instrumental in the development of a continuing education course. In addition, the database generated through this project will become available to the community through a web server that our group is already operating. Finally, an effort will be initiated to organize workshops focused on the identification of modeling issues in turbulent transport and of databases that can serve as validation benchmarks.

智力优势：本研究的总体目标是探索各向异性湍流情况下湍流传热的基本机制。项目期间的具体目标是：（a）研究固体边界附近（粘性壁区和对数层）湍流输运的物理机制;（B）确定普朗特数对湍流输运特性的影响（例如，（c）开发用于模拟热与流体流动耦合以及用于化学反应湍流的算法。所提出的方法是使用直接数值模拟产生的流体动力学来产生湍流扩散的拉格朗日数据。这种拉格朗日方法允许研究实际感兴趣但性质不同的流体（例如，液态金属，气体，制冷剂，电化学流体），并调查的情况下，传统的数值方法往往是不可行的与目前的超级计算机的能力。拟议活动的更广泛的影响：这项研究的结果将是重要的湍流传输理论以及工业和环境应用，其中模拟湍流传输是重要的（例如，化学反应器的设计，不同普朗特数流体的热交换器的设计，污染物扩散的预测和控制，移动叶片上的热传递）。拟议的研究项目的各个方面将有助于继续教育课程的发展。此外，通过该项目生成的数据库将通过我们小组已经运行的网络服务器提供给社区。最后，将努力组织讲习班，重点是确定湍流输送中的建模问题和可作为验证基准的数据库。