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

摘要CTS-0348572 S。在过去的20年里，计算机资源和实验室方法的发展正在扩大我们对湍流的理解，并使环境流体力学领域发生革命性变化。 通过这些进步，环境流体力学越来越能够评估瞬时湍流速度和浓度场，而不再仅仅依赖于平均量。该职业计划解决了环境应用中多相羽流的不稳定性，湍流波动和相干结构，并推进了可用于教学和交流环境流体力学现代观点的课程。分层和流动环境中的多相羽流发生在广泛的工业和环境应用中。该职业提案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。实验室实验将测量在分层、横流和两者的组合中多相羽流的瞬时速度和浓度的全场。一个主要的正交分解（POD）的分散相和夹带的流体运动将阐明相之间的分离和相干结构之间的相关性的分散相和夹带的周围流体的机制。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进课堂。这个职业建议的目标是开发课程和资源，用于向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，并辅之以一个全面的互动网站和在线评估工具。还将利用网络的可视化和动画功能，向K-12学生介绍环境流体力学中的常见问题以及拟议的多相羽流研究结果。还建议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问题研究所（EGW）的形式，举办国际论坛和建立伙伴关系，以便使拟议的活动产生尽可能广泛的影响。拟议活动的智力优势：这个职业建议响应当前的需求，在设计，分析和预测多相羽流在环境应用与先进的调查方法。实验室测量将提供基本的洞察多相羽流的湍流特性。POD分析将用于评价相干结构在控制多相羽流中污染物输送方面的作用，并开发适当的湍流模型。通过课程的开发，可视化和动画的实用性，以沟通复杂的主题将进行调查。拟议活动产生的更广泛影响：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，提供实验室数据，开发的数值模型，并说明重要的多相羽流物理动画。还将开发一本课程教科书和教育网站，强调通过使用可视化、动画和互动组件与广大受众进行外联。还将制定与德国的研究和教育交流计划，以促进跨文化交流和理解。

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.