CAREER: Geophysical Flow control

PI：Guala，MichelleProposal编号：1351303这个职业项目的重点是使用空气动力学领域的被动/主动流动控制概念，以便在地球物理尺度上控制流动-表面相互作用。人们发现，自然景观的大尺度特征与不断重塑受限景观(如河流、洋流或风的流动)的湍流的超大规模结构相重叠。PI建议探索大尺度湍流与可侵蚀地形演变之间的关系，然后将这一知识与流动控制概念一起用于塑造自然地形，引入地球物理流动控制(GFC)的概念。流动控制已广泛应用于航空航天，以控制翼型上的层流到湍流的转变，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，观察到的大尺度模式是由流动不稳定性造成的，与控制湍流壁面边界流动的流动不稳定有所不同。该委员会建议将流量管制方法扩展至天然或已建成环境中的蜿蜒水流，以期达到特定的水流或地形模式。通过识别自然动力系统的内在不稳定性并了解它们的控制机制，人们可以有选择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具体的基准实验进行验证。更广泛的影响：该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曲折模式的形成和演变。通过该项目产生的基本知识可影响河流和河口恢复项目，以及在适当地点部署海洋水力涡轮机，从而利用河流中的能量的进程。教育计划是构建一个可移动的GFC示范模型，例如，可以在明尼苏达州的凝视博览会或K-12巡回赛中使用。它还包括建立远程控制实验和虚拟野外实验的公开竞争。将利用明尼苏达大学圣安东尼瀑布实验室正在进行的外联活动，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.