CAREER: Geophysical Flow control

主要研究者：Guala，Michelle提案编号：1351303该CAREER项目的重点是使用来自空气动力学领域的被动/主动流控制概念，以便在地球物理尺度上控制流面相互作用。自然景观的大特征尺度与湍流的大尺度结构重叠，湍流不断重塑限制景观（如河流，海洋溪流或风）。PI提出探索大尺度湍流与易蚀地形演变之间的关系，然后利用这一知识沿着与流动控制概念来塑造自然地形，引入地球物理流动控制（GFC）的概念。智力优点：流动控制已被广泛用于航空领域，以控制翼型上的层流到湍流过渡，或通过扰动边界条件来改变湍流边界层的结构。在许多地球物理流动中，所观察到的大尺度模式是由流动不稳定性引起的，这与那些控制湍流壁边界流动的不稳定性有些不同。PI建议将流量控制方法扩展到自然或建筑环境中的蜿蜒流的情况，旨在实现特定的流量或地形模式。通过识别自然动力系统的内在不稳定性，并通过理解其控制机制，人们可以选择性地抑制这些不稳定性并控制它们的影响。地球物理流量控制将通过特定的基准实验进行验证。 更广泛的影响：项目的成功完成将能够控制影响沿海或河流环境中整个社区经济的蜿蜒模式的形成和演变。通过这个项目产生的基本知识可以影响河流和河口恢复项目，以及在适当的地点部署海洋水力涡轮机来利用河流中的能源。教育计划是建立一个可移动的GFC示范模型，可用于，例如，在明尼苏达州的凝视博览会或在K-12图尔斯旅游。它还包括建立一个远程控制实验和虚拟现场实验的公开竞争。将利用明尼苏达大学圣安东尼福尔斯实验室正在进行的推广活动，向学生和公众介绍该项目的教育活动。

PI: Guala, MichelleProposal Number: 1351303The focus of this CAREER project is to use concepts from passive/active flow control from the field of aerodynamics in order to control flow-surface interactions at the geophysical scale. The large characteristic scales of natural landscapes are found to overlap with the very large scale structures of the turbulent flow that continuously reshape the confining landscape (such as flow of rivers, ocean streams, or wind). The PI proposes to explore the relationship between the large scales of turbulent flows and the evolution of an erodible topography, and then to use this knowledge along with flow control concepts to shape natural topography, introducing the concept of Geophysical Flow Control (GFC).Intellectual Merit:Flow control has been extensively used in aeronautics to control laminar to turbulent flow transition on airfoils, or to alter the structure of turbulent boundary layers through perturbations of the boundary conditions. In many geophysical flows, the observed large scale patterns result from flow instabilities somewhat different from those governing turbulent wall-bounded flows. The PI proposes to extend the flow control approach to the case of meandering flows in natural or built environments, aiming at achieving specific flow or topographic patterns. By identifying the intrinsic instabilities of a natural dynamical system and by understanding their governing mechanism one can selectively dampen these instabilities and control their effects. Geophysical flow control will be validated through specific benchmark experiments. Broader Impacts:Successful completion of the project will enable the control of the formation and evolution of meandering patterns affecting the economy of entire communities in coastal or fluvial environments. Fundamental knowledge generated through this project can affect river and estuarine restoration projects, as well as the process of harnessing energy in river flows with the deployment of marine hydrokinetic turbines at the appropriate locations. The educational plan is to construct a movable GFC demonstration model that can be used, for example, at the Minnesota Stare Fair or in K-12 tours. It also includes the establishment of an open competition for a remotely-controlled experiment and a virtual field experiment. The ongoing outreach activities at St. Anthony Falls Laboratory at the University of Minnesota will be utilized to bring exposure of the educational activities of the project to students and the public.