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.

智力优点：拟议研究的总体目标是探索在各向异性湍流的情况下湍流传热的基本机制。该项目持续时间的特定目标是：（a）研究接近固体边界的湍流运输的物理机制（在粘性壁区域和对数层中）； （b）确定prandtl数量对湍流传输特性的影响（例如，对湍流的prandtl数字和努塞尔的数字）； （c）开发用于模拟耦合热和流体流以及化学反应湍流的算法。提出的方法是使用直接数值模拟生成的流体力学来生成拉格朗日数据以进行湍流分散。这种拉格朗日的方法允许研究实际兴趣的流体，但特性（例如，液体金属，气体，气体，制冷剂，电流液），并调查了常规数值方法通常不可行的案例，与超级计算机的当前能力相关。建模湍流转运很重要（例如，化学反应堆的设计，用于不同prandtl数量流体的热交换器的设计，污染物分散体的预测和控制，对移动叶片的热传递）。拟议的研究项目的观察者将在继续教育课程的发展中发挥作用。此外，通过该项目生成的数据库将通过我们的组已经运行的Web服务器可用于社区。最后，将开始努力组织工作坊，重点是识别湍流运输和可以用作验证基准的数据库中的建模问题。