Flexible kirigami sheets in uniform and disturbed fluid flow

均匀和扰动流体流动中的柔性剪纸片

• 批准号: 2320300
• 负责人: Yahya Modarres-Sadeghi
• 金额: $ 32.31万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-01 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2320300&HistoricalAwards=false
• 关键词: Flexible; kirigami; sheets; uniform; disturbed

The research will investigate the behavior of kirigami sheets placed in fluid flow. Research into applications of kirigami, wherein patterns of cuts are made in a sheet of material, has increased dramatically across a wide range of research areas in recent years due to the complex three-dimensional shapes that simple two-dimensional kirigami patterned sheets can assume when forces are applied on them. Despite the significant existing literature on kirigami patterns, their use in fluid mechanics has been extremely limited. In this work, the behavior of kirigami sheets placed in fluid flow is investigated. The broader impacts of this project extend to being able to design and deploy kirigami sheets with desired geometries, desired wakes, and for desired tasks. This ability will enable several applications in flow mixing, flow control, and underwater soft robotics. The findings of this research will be disseminated at different levels by integrating the proposed research into the outreach programs for K-12 students and by incorporating this research into classes. A galley exhibition will be designed and built based on the results of this work to render the invisible scientific phenomena tangible for a lay audience, and to spark deep interest in fluid mechanics research for younger generations.A kirigami sheet placed in fluid flow constitutes fluid-structure interactions (FSI) at different scales: the cut-scale and the sheet-scale. The preliminary results of this work have shown samples of a variety of three-dimensional shapes that kirigami sheets assume when they are placed in flow. These results show that kirigami sheets in flow can undergo static or dynamic flow-induced instabilities as a result of buckling or limit cycle oscillations. This project first focuses on investigating the behavior of previously designed kirigami patterns placed in flow. Then the project focuses on designing new kirigami patterns for fluid-specific applications and studying their behavior in uniform and disturbed flows. The goals of this work will be achieved by conducting several series of experiments where kirigami-patterned sheets are placed in fluid flow. Their displacements will be tracked using high speed cameras, and the resulting wakes will be quantified using bubble image velocimetry (BIV). The results of this project will potentially impact areas such as flow control and FSI by archiving the three-dimensional shapes and wakes for others in the community.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.

该研究将研究放入流体流中的基里加米板的行为。 Kirigami的应用研究，其中削减模式是在材料中进行的，近年来由于复杂的三维形状，近年来在广泛的研究领域中急剧增加，这些形状复杂，简单的二维kirigami图案纸可以假设何时在其上施加力。尽管现有有关基里加米模式的现有文献，但它们在流体力学中的使用非常有限。在这项工作中，研究了放置在流体流中的基里加米板的行为。该项目的更广泛影响扩展到能够以所需的几何形状，所需的唤醒以及所需的任务来设计和部署Kirigami床单。此功能将使流量混合，流控制和水下软机器人技术实现多种应用。这项研究的发现将通过将拟议的研究集成到针对K-12学生的外展计划中并将这项研究纳入课堂上的范围来传播。将根据这项工作的结果进行设计和建造厨房展览，以使外行受众无形的科学现象有形，并激发对年轻一代流体力学研究的浓厚兴趣。放置在流体流中的基里加米纸构成流体结构的互动（FSI）（FSI），以不同的尺度：切割尺度和床单和床单。这项工作的初步结果表明，Kirigami床单将其放入流动时假设的各种三维形状的样品。这些结果表明，由于屈曲或限制周期振荡的结果，流动中的基里加米板会经历静态或动态流动引起的不稳定性。该项目首先着重研究以前设计的基里加米模式的行为。然后，该项目着重于为流体特异性应用设计新的基里加米模式，并以统一和干扰的流​​动研究其行为。这项工作的目标将通过进行几个系列实验来实现，其中将kirigami图案放置在流体流中。它们的位移将使用高速摄像头跟踪，并将使用气泡图像赛车测定法（BIV）来量化所得的唤醒。该项目的结果将通过为社区中的其他人归档三维形状和唤醒来影响流程控制和FSI等领域。该奖项反映了NSF的法定任务，并且认为值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来进行评估。