Collaborative Research: Unraveling the Spatiotemporal Dynamics of Inertio-Elastic Turbulence using Measurements and Data-Infused Simulations

合作研究：利用测量和数据注入模拟揭示惯性弹性湍流的时空动力学

基本信息

批准号：
2027870
负责人：
Gareth McKinley
金额：
$ 24.75万
依托单位：
Massachusetts Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2027870&HistoricalAwards=false
关键词：
Collaborative Research Unraveling Spatiotemporal Dynamics

项目摘要

When polymers are added to a solvent, even in very dilute solutions, they markedly change the behavior of the fluid in intriguing ways, such as reducing the drag force of flow past objects. Polymer-induced drag reduction in marine transport applications can result in 20-25% decrease in frictional energy losses and can thus have a major impact on society in the form of reduced fuel consumption and carbon dioxide emissions. However, the changes induced in the time-varying three-dimensional fluid dynamics are often counter-intuitive and poorly understood. In some configurations, the polymeric solution can introduce new flow instability mechanisms that would not be possible in typical fluids; yet in other regimes, the same forces can also have the seemingly opposite effect of mitigating the energetic eddying motions of turbulence. Direct imaging of the evolution of turbulent flow structures is needed, and it requires a technique with very high resolution and sensitivity. The research plan to achieve this goal is tightly coupled with an education and outreach plan that includes both curriculum development and supplemental lectures and interactive lab demonstrations for Engineering Innovation through summer programs for high-school and college-level STEM students at both universities.The research involves detailed experiments using a unique imaging system to probe how a polymeric jet injected into a surrounding Newtonian fluid becomes unstable. These visualizations will enable a detailed characterization of the mixing between the polymeric jet and the surrounding fluid and the amplification rate of jet instability. The results from the experiments will be complemented by first-of-their-kind measurement-infused simulations of the same configuration. By directly integrating the measurements into the simulations, computations will probe the exact same flow and provide all the additional details that cannot be measured directly in the laboratory. The coupled results from both the experiments and simulations will provide an unprecedented view of the mechanisms through which polymer solutions alter turbulent flow instabilities. Ultimately, such insights will explain how molecular parameters such as chain extensibility and flow elasticity control polymer drag reduction and help guide selection of novel biopolymer sourced additives that can serve as cheap and environmentally friendly substitutes for traditional drag reduction agents such as synthetic polymers derived from hydrocarbon resources.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当将聚合物添加到溶剂中，即使是在非常稀释的溶液中，它们也会以有趣的方式显着改变流体的行为，例如减少流过的物体的阻力。聚合物引起的海洋运输应用减少阻力可能会导致摩擦能量损失减少20-25％，从而以减少燃油消耗和二氧化碳排放的形式对社会产生重大影响。然而，在时间变化的三维流体动力学中引起的变化通常是违反直觉且了解不足的。在某些配置中，聚合物解决方案可以引入新的流动不稳定性机制，而在典型的流体中可能无法实现。然而，在其他政权中，相同的力量也可以具有减轻湍流的能量涡流运动的看似相反的作用。需要直接成像湍流结构的演变，并且需要具有很高分辨率和灵敏度的技术。实现这一目标的研究计划与包括课程发展和补充讲座的教育和外展计划紧密相结合，以及通过夏季课程，通过夏季课程为两所大学的高中和大学级别的STEM学生进行工程创新。该研究涉及使用独特的成像系统进行详细的实验，以探测一个独特的成像系统，以探测各种各样的注射式启动，以探测周围的新兴型的动态。这些可视化将使聚合物射流与周围流体之间的混合以及射流不稳定性的扩增速率进行详细的表征。实验的结果将通过对同一配置的第一届测量拟合模拟进行补充。通过将测量值直接集成到模拟中，计算将探测完全相同的流量，并提供直接在实验室中直接测量的所有其他细节。实验和仿真的耦合结果将为聚合物溶液改变湍流不稳定的机制提供前所未有的视图。最终，此类见解将解释如何减少分子参数，例如可扩展性和流动弹性控制聚合物阻力，并有助于指导选择新型生物聚合物的添加剂，这些添加剂可以用作廉价且对环境友好的替代品，用于传统的阻力降低代理，以减少诸如Synthetic Polymer的诸如Synthetic Polymers的诸如Synthetic Polycomers的基础奖。优点和更广泛的影响审查标准。