Toward the Design and Control of Dynamical Transport Barriers in Nonlinear Flow

非线性流动中动力传输势垒的设计与控制

基本信息

  • 批准号:
    1563489
  • 负责人:
  • 金额:
    $ 34.5万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2016
  • 资助国家:
    美国
  • 起止时间:
    2016-04-01 至 2020-03-31
  • 项目状态:
    已结题

项目摘要

Fluid flows in natural and engineered systems, such as those in the ocean, atmosphere, or industrial machinery, are typically complex and variable in both space and time. Such flows mix efficiently on average, and they rapidly disperse material that they carry with them. They do not, however, mix uniformly. Rather, they spontaneously form complex patterns that lead to persistent inhomogeneities. In an oil spill, for example, oil does not move away uniformly from its source; instead, the oil wanders out in tendrils and whorls that are locked to the underlying structure of the ocean surface flow. In recent years, powerful methods have been developed to uncover the hidden structures that govern mixing in unsteady flows, and to isolate the transport barriers that separate different regions of the flow. Almost nothing is known, however, about how to control the location or presence of these dynamical barriers, or even whether it is possible to do so. This award will support research to demonstrate that control of these barriers is indeed possible, and to understand how barriers respond to external forces or to the shape of the container holding the fluid. The results of this research will have significant implications in a range of applications. For example, knowing how barriers in the ocean are related to coastline shape will inform the siting of coastal facilities that may discharge waste products or the deployment of limited resources in an environmental disaster. In other situations, such as in industrial mixers, rapid mixing is desirable, and so understanding how to inhibit the formation of transport barriers would be valuable.Existing methods for locating transport barriers often require knowledge of the future evolution of the flow, and so have limited utility as predictive tools. This research will surmount this limitation by asking not how barriers will evolve naturally but rather how they can be manipulated and controlled. Two ways to control transport barriers will be investigated in an electromagnetically driven laboratory flow: control via spatio-temporally modulated applied body forces and control via lateral and bottom boundary shape. By demonstrating how transport barriers respond to manipulation of these quantities rather than to an imposed control velocity field, which is difficult to achieve in practice, the results of the research will pave the way for the development of implementable control strategies for real-world situations.
自然和工程系统中的流体流动,例如海洋、大气或工业机械中的流体流动,通常在空间和时间上都是复杂和可变的。平均而言,这种流动混合效率很高,它们迅速分散了它们携带的材料。然而,它们并不均匀地混合。相反,它们自发地形成复杂的模式,导致持久的不均匀性。例如,在石油泄漏中,石油并不是均匀地从其源头移动;相反,石油以卷须和螺旋的形式游荡出来,这些卷须和螺旋被锁定在海洋表面流动的底层结构上。近年来,已经开发出了强有力的方法来揭示非定常流中控制混合的隐藏结构,并隔离分离不同流动区域的传输障碍。然而,关于如何控制这些动态障碍的位置或存在,甚至是否有可能这样做,几乎一无所知。该奖项将支持研究,以证明这些障碍的控制确实是可能的,并了解障碍如何响应外力或容纳流体的容器的形状。这项研究的结果将在一系列应用中产生重大影响。例如,了解海洋中的障碍物与海岸线形状的关系,将有助于确定可能排放废物的沿海设施的选址,或在环境灾难中部署有限的资源。在其他情况下,如在工业混合器中,快速混合是可取的,因此了解如何抑制传输障碍的形成将是有价值的,现有的方法定位传输障碍往往需要的流动的未来演变的知识,因此具有有限的实用性作为预测工具。这项研究将超越这一限制,不问障碍将如何自然演变,而是如何操纵和控制它们。在电磁驱动的实验室流中,将研究两种控制传输障碍的方法:通过时空调制施加的体积力控制和通过横向和底部边界形状控制。通过演示运输障碍如何响应这些量的操纵,而不是施加控制速度场,这是很难在实践中实现的,研究的结果将铺平道路,为现实世界的情况下,可实施的控制策略的发展。

项目成果

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Nicholas Ouellette其他文献

Nicholas Ouellette的其他文献

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{{ truncateString('Nicholas Ouellette', 18)}}的其他基金

Development and Validation of an In-Situ Particle Tracking Velocimetry System for Ocean Turbulence Measurement
用于海洋湍流测量的原位粒子跟踪测速系统的开发和验证
  • 批准号:
    2219857
  • 财政年份:
    2022
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Geometric Structure of the Turbulent Cascade
湍流级联的几何结构
  • 批准号:
    1706950
  • 财政年份:
    2017
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Bulk Turbulence in Polymer Solutions: Beyond Friction Drag Reduction
聚合物溶液中的整体湍流:超越摩擦减阻
  • 批准号:
    1600292
  • 财政年份:
    2015
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Bulk Turbulence in Polymer Solutions: Beyond Friction Drag Reduction
聚合物溶液中的整体湍流:超越摩擦减阻
  • 批准号:
    1436423
  • 财政年份:
    2014
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Linking Spatial and Spectral Transport in Two-Dimensional Fluid Flow
连接二维流体流动中的空间和光谱传输
  • 批准号:
    1206399
  • 财政年份:
    2012
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Theories and Experiments on Scalar Mixing in Chaotic Flows
协作研究:混沌流中标量混合的理论与实验
  • 批准号:
    1211952
  • 财政年份:
    2012
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant
Connecting Dynamical Structure and Statistical Analysis in Quasi-2D Fluid Flow
连接准二维流体流动中的动力结构和统计分析
  • 批准号:
    0906245
  • 财政年份:
    2009
  • 资助金额:
    $ 34.5万
  • 项目类别:
    Standard Grant

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