CAREER: The Role of Turbulence, Coherent Structures, and Intermittency for Controlling Transport in Multiphase Plumes in the Environment

职业：湍流、相干结构和间歇性在控制环境中多相羽流传输中的作用

• 批准号: 0348572
• 负责人: Scott Socolofsky
• 金额: --
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0348572&HistoricalAwards=false
• 关键词: CAREER; Role; Turbulence; Coherent; Structures

AbstractCTS-0348572S. Socolofsky, Texas A&M UniversityDevelopments in computer resources and laboratory methods over the past 20 years are expanding our understanding of turbulence and revolutionizing the field of environmental fluid mechanics. Through these advances, environmental fluid mechanics is increasingly in a position to evaluate the instantaneous, turbulent velocity and concentration fields and no longer must rely on mere average quantities. This Career proposal addresses intermittency, turbulent fluctuations, and coherent structures for multiphase plumes in environmental applications and advances the curriculum available for teaching and communicating a modern view of environmental fluid mechanics.Multiphase plumes in stratified and flowing ambient environments occur in a wide range of industrial and environmental applications. This Career proposal seeks to understand the instantaneous characteristics of field-scale plumes to predict biologic impacts and to interpret real-time field measurements of purposeful, natural, and accidental injections. Laboratory experiments will measure full-fields of instantaneous velocity and concentration for multiphase plumes in stratification, crossflow, and combinations of both. A primary orthogonal decomposition (POD) of the dispersed phase and entrained fluid motions will elucidate mechanisms for separation between phases and correlations between coherent structures in the dispersed-phase and entrained ambient fluid. The laboratory data will be used to develop dynamic sub-grid scale models for turbulence simulations. To test the analysis methods developed in this proposal, field data for carbon dioxide sequestration plumes in the oceans will be made available.Environmental fluid mechanics is a rapidly advancing field of engineering, and new materials are needed to bring these advances into the classroom. The objective of this Career proposal is to develop curriculum and resources for teaching environmental fluid mechanics to a wide range of audiences. A textbook for senior-level undergraduates and first-year graduate students will be developed and complimented by a comprehensive, interactive website and online assessment tools. The visualization and animation capabilities of the web will also be exploited to introduce K-12 students to common problems in environmental fluid mechanics and to the results of the proposed research on multiphase plumes. International forums and partnerships, in the form of an international exchange with Germany and participation in the International Association ofHydraulic Engineering and Research (IAHR) European Engineering Graduate School Environment Water (EGW) are also proposed to give the broadest possible impact to the proposed activities. The intellectual merits of the proposed activity: This Career proposal responds to current needs in design, analysis, and prediction of multiphase plumes in environmental applications with advanced investigative methods. The laboratory measurements will provide fundamental insight into the turbulent properties of multiphase plumes. The POD analysis will be used to evaluate the role of coherent structures in controlling pollutant transport in multiphase plumes and to develop appropriate turbulence models. Through the curriculum development, the utility of visualization and animation to communicate complex topics will be investigated. The broader impacts resulting from the proposed activity: The activities identified in this Career proposal provide important resources for learning, understanding, and advancing environmental fluid mechanics. A research website will be developed that gives access to the laboratory data, developed numerical models, and animations illustrating important multiphase plume physics. A course textbook and educational website will also be developed that emphasizes outreach to a broad audience through use of visualization, animation, and interactive components. A research and educational exchange program with Germany will also be developed to promote cross-cultural communication and understanding.

abstractcts - 0348572。在过去的20年里，计算机资源和实验室方法的发展扩大了我们对湍流的理解，并彻底改变了环境流体力学领域。通过这些进展，环境流体力学越来越能够评估瞬时、湍流速度和浓度场，而不再必须依赖于仅仅的平均值。本职业建议涉及环境应用中多相羽流的间歇性、湍流波动和连贯结构，并推进可用于教学和交流现代环境流体力学观点的课程。分层流动环境中的多相羽流在工业和环境领域有着广泛的应用。本职业计划书旨在了解现场规模羽流的瞬时特征，以预测生物影响，并解释有目的、自然和意外注入的实时现场测量结果。实验室实验将测量多相羽流在分层、横流和两者结合时的瞬时速度和浓度的全场。分散相和夹带流体运动的初步正交分解（POD）将阐明相分离的机制以及分散相和夹带流体中相干结构之间的相关性。实验室数据将用于开发湍流模拟的动态亚网格尺度模型。为了测试本提案中开发的分析方法，将提供海洋中二氧化碳固存羽流的实地数据。环境流体力学是一个快速发展的工程领域，需要新的材料将这些进步带入课堂。本职业建议的目标是开发课程和资源，为广泛的受众教授环境流体力学。将为高年级本科生和一年级研究生编写一本教科书，并辅以一个全面的、互动的网站和在线评估工具。网络的可视化和动画功能也将被利用来向K-12学生介绍环境流体力学中的常见问题和多相羽流的研究结果。国际论坛和伙伴关系，以与德国进行国际交流和参加国际水利工程与研究协会（IAHR）欧洲工程研究生院环境水（EGW）的形式，也建议对拟议的活动产生尽可能广泛的影响。所提议的活动的智力优点：本职业建议响应当前的需求，设计，分析和预测多相羽流在先进的调查方法的环境应用。实验室测量将为多相羽流的湍流特性提供基本的见解。POD分析将用于评估相干结构在控制多相羽流中污染物运移中的作用，并开发适当的湍流模型。通过课程的发展，可视化和动画的应用，以交流复杂的主题将被调查。所建议的活动产生的更广泛的影响：本职业建议中确定的活动为学习、理解和推进环境流体力学提供了重要资源。将开发一个研究网站，提供访问实验室数据，开发数值模型和动画，说明重要的多相羽流物理。还将开发课程教科书和教育网站，强调通过使用可视化、动画和互动组件向广大受众提供服务。与德国开展研究和教育交流项目，促进跨文化交流和理解。