CAREER: A Numerical Laboratory for Immiscible Interface Dynamics

1054272 Herrmann涉及不混溶的液体/气体或液体/液体界面的流动在从医疗喷雾和燃料喷射系统到水下石油泄漏的许多不同应用中起着至关重要的作用。在燃料喷射系统中，液体/气体界面的动力学导致燃料喷雾的形成，直接影响发动机性能、效率和污染物产生。在水下石油泄漏中，不混溶界面的动力学决定了石油是否会上升到海洋表面以形成浮油，或者分解成小规模的液滴以在表面下形成悬浮的羽流。虽然不混溶界面的流动在这些和许多其他应用中具有突出的作用，但它们还没有得到很好的理解，并且不混溶界面的复杂动力学没有全面的预测模型。 这项建议的目的是开发一个数值实验室的流量与不混溶的接口，使预测模拟，即使在操作和环境条件下，我们的外部实验观察制度。实现这一目标的方法是基于开发和应用新的数值技术来求解第一原理导出的控制方程。新的代码和解决方案验证技术将确保解决方案的技术和所获得的数值结果的一致性。 这个建议的智力价值是，它将提供一个新的，全面的工具，发现涉及不混溶界面的流动经历复杂的过渡，如雾化，复杂的几何形状。对界面动力学与局部流场和复杂几何形状的相互作用的新见解将导致对许多技术应用领域中的这种流动的新理解，即使在实验无法观察到的条件下。例如，在燃料雾化器的情况下，无需调整的实验室的预测性质可以使设计理念从依赖于现有实验数据的传统增量改进转变为根本上新的设计概念，其中没有实验数据存在。设计空间的这种扩展可以导致改进的燃料雾化器，包括针对生物燃料的新概念。它还可以在部署之前对水下石油泄漏的遏制战略进行分析，从而可以用于帮助预先验证不同泄漏情况下的遏制战略，从而通过减少当前的试错方法来缩短响应时间。 这项提案的更广泛影响包括一个小学外展计划“Fun with Flows”，该计划针对亚利桑那州一所一级小学的六年级学生。该计划由合作开发的教学和评估模块组成，突出了流量工程应用。它整合并建立在现有的AIMS课程基础上，旨在帮助学生在标准化考试中表现良好，从而确保与学校教师优先事项和计划的一致性。来自“Fun with Flows”的评估数据将使用工程教育工具进行分析，并发布，并形成受资助研究生工程教育集中要求的基础。拟议的研究将涉及代表性不足的少数民族和女本科生，并将结果纳入交叉列出的本科/研究生水平课程。

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.