CAREER: A Numerical Laboratory for Immiscible Interface Dynamics

职业：不混溶界面动力学数值实验室

• 批准号: 1054272
• 负责人: Marcus Herrmann
• 金额: $ 40.08万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1054272&HistoricalAwards=false
• 关键词: CAREER; Numerical; Laboratory; Immiscible; Interface

1054272HerrmannFlows involving immiscible liquid/gas or liquid/liquid interfaces play a crucial role in many diverse applications ranging from medical sprays and fuel injection systems to underwater petroleum spills. In fuel injection systems, the dynamics of the liquid/gas interface lead to the formation of a fuel spray directly impacting engine performance, efficiency, and pollutant production. In underwater petroleum spills, the dynamics of the immiscible interface determines whether the oil will rise to the ocean surface to form a slick, or break up into small scale drops to form suspended plumes beneath the surface. Although flows with immiscible interfaces have a prominent role in these and many other applications, they are not well understood and no comprehensive predictive model for the complex dynamics of immiscible interfaces exists. The objective of this proposal is to develop a numerical laboratory for flows with immiscible interfaces that will enable predictive simulations even in operating and environmental conditions, that our outside experimentally observable regimes. The approach to achieve this goal is based on developing and applying novel numerical techniques to solve governing equations derived from first principle. New code and solution verification techniques will ensure consistency of the solution technique and the obtained numerical results. The intellectual merit of this proposal is that it will provide for a novel, comprehensive tool of discovery for flows involving immiscible interfaces undergoing complex transitions, like atomization, inside complex geometries. New insights into the interplay of interface dynamics with local flow fields and complex geometries will result in a new understanding of such flows in many technical application areas even under conditions that cannot be observed experimentally. In the case of fuel atomizers, for example, the predictive nature of the laboratory requiring no tuning can enable a transformative shift in design philosophy away from traditional incremental improvements that rely on existing experimental data, to radically new design concepts, where no experimental data exists. Such an expansion of design space can lead to improved fuel atomizers including targeted new concepts for biofuels. It can also enable analysis of containment strategies for underwater petroleum spills before they are deployed and thus might be used to help pre-certify containment strategies for varying spill scenarios, thereby shortening response times by cutting down on current trial and error approaches. The broader impacts of this proposal include an elementary school outreach program "Fun with Flows" that targets sixth graders in a Tier I elementary school in Arizona. The program consists of collaboratively developed teaching and assessment modules highlighting flow engineering applications. It integrates and builds upon the existing AIMS curriculum and is designed to prepare students to perform well on standardized examinations, thus ensuring consistency with school teacher priorities and longevity of the program. Assessment data from \Fun with Flows" will be analyzed using engineering education tools, published, and form the basis of the funded graduate student's Engineering Education Concentration requirement. The proposed research will involve underrepresented minorities and female undergraduate students and incorporate the results in cross- listed undergraduate/graduate level courses.

1054272 HerrmannFlow涉及不相容的液/气或液/液界面，在许多不同的应用中发挥着关键作用，从医用喷雾和燃料喷射系统到水下石油泄漏。在燃油喷射系统中，液/气界面的动力学导致燃油喷雾的形成，直接影响发动机的性能、效率和污染物的产生。在水下石油泄漏中，不混溶界面的动力学决定了石油是会上升到海洋表面形成浮油，还是会分解成小水滴在表面下形成悬浮羽流。尽管具有不混溶界面的流动在这些和许多其他应用中具有重要的作用，但人们对它们的理解还不是很好，也没有全面的预测模型来描述不混相界面的复杂动力学。这项提议的目标是建立一个不相容界面流动的数值实验室，即使在运行和环境条件下也能进行预测性模拟，我们的外部实验可观察到的区域。实现这一目标的方法是发展和应用新的数值技术来求解由第一原理导出的控制方程。新的代码和解验证技术将确保解技术和所获得的数值结果的一致性。这一提议的智力价值在于，它将为发现复杂几何结构内经历复杂转变(如雾化)的不混相界面的流动提供一种新的、全面的工具。对界面动力学与局部流场和复杂几何形状相互作用的新见解将导致对许多技术应用领域中此类流动的新理解，即使在实验无法观察到的条件下也是如此。例如，以燃料雾化器为例，无需调整的实验室的预测性可以使设计理念从依赖现有实验数据的传统渐进式改进转变为根本不存在实验数据的全新设计概念。这种设计空间的扩展可以导致改进的燃料雾化器，包括有针对性的生物燃料新概念。它还可以在部署之前对水下石油泄漏的遏制策略进行分析，因此可以用来帮助预先认证针对不同泄漏情况的遏制策略，从而通过减少当前的试验和错误方法来缩短响应时间。这项提议的更广泛的影响包括一项针对亚利桑那州一所第一小学六年级学生的小学外展计划“流动的乐趣”。该计划由合作开发的教学和评估模块组成，突出流动工程的应用。它整合并建立在现有的AIMS课程基础上，旨在为学生在标准化考试中取得良好表现做好准备，从而确保与学校教师的优先事项保持一致，并确保该计划的持久性。来自\FUN With Flow“的评估数据将使用工程教育工具进行分析，并发布，并形成资助研究生工程教育专注度要求的基础。拟议的研究将涉及代表性不足的少数族裔和女性本科生，并将结果纳入交叉列出的本科生/研究生水平的课程。