EAGER: Collaborative Research: Cloaking in stratified fluids

Pi：Alam，M.-Reza/Ardekani，Arezoo建议编号：1414579/1414581机构：加州大学伯克利分校标题：EIGER：协作研究：分层流体中的隐身拟议研究的目标是探索开发和部署相当于“隐形斗篷”的可能性，使漂浮的风能收集涡轮机看不到海面波。由超材料制成的隐形斗篷被认为是21世纪头十年固体物理学、光学和声学的十大重要发现之一，但现在正在流体力学和水波的背景下讨论这一发现。智能价值当表面波绕过物体时，就像物体不存在一样，即当没有绕射时，可以完成水面上物体的隐形斗篷。这种隐形的一个重要后果是，隐形区域中的漂浮结构和物体将受到保护，免受强大的入射表面波的影响。拟议的研究将通过使用理论、计算和实验相结合的方法，在流体力学的背景下第一次大踏步进入这一领域。这项研究集中于浮力跳跃(典型的海洋和湖泊)、粘性、惯性、扩散和海底地形的不均匀对陡峭和连续层化流体中隐身的影响。广泛影响该研究计划可以导致设计新的策略来保护移动和静止的海洋物体(船舶、潜艇、海上平台，如风力涡轮机)免受海浪的破坏。在这项工作中，将使用基本流体力学来加强这一领域的水生科学和海洋学。这项拟议的研究具有潜在的变革性，因为到目前为止，流体力学的这一领域基本上还没有被探索过。这笔赠款还将为培养两名研究生提供部分支持。将通过加州大学伯克利分校和圣母大学的妇女工程方案促进妇女和代表性不足群体成员的参与。PIS将通过伯克利和圣母大学的本科生研究机会计划确保本科生的参与。

PI: Alam, M.-Reza/Ardekani, ArezooProposal Number: 1414579/1414581Institution: University of California-BerkeleyTitle: EAGER: Collaborative Research: Cloaking in stratified fluidsThe objective of the proposed research is to explore the possibility of developing and deploying the equivalent of an "invisibility cloak" to render floating wind energy harvesting turbines invisible to ocean surface waves. Invisibility cloaks, made of metamaterial, have identified as one of the top ten important discoveries in solid state physics, optics, and acoustics in the first decade of 21st century, but this is now being discussed in the context of fluid mechanics and water waves.Intellectual MeritAn invisibility cloak for an object at the water surface can be accomplished when the surface waves detour the object as if the object does not exist, i.e., when there is no diffraction. An important consequence of such a cloaking is that floating structures and objects in a cloaked region will be protected from powerful incoming surface waves. The proposed research will take first strides into this area in a fluid mechanics context by using a combined theoretical, computational, and experimental approach. The research is focused on the effect of buoyancy jump (typical of oceans and lakes), viscosity, inertia, diffusion, and non-uniformities of seabed topography on cloaking in both sharp and continuous stratified fluids.Broader ImpactsThis research program can lead to designing new strategies to protect moving and stationary ocean objects (ships, submarines, offshore platforms such as wind turbines) from disruptive effects of oceanic waves. In this work, fundamental fluid mechanics will be used to augment this area of aquatic science and oceanography. The proposed research is potentially transformative in that this area of fluid mechanics has to date gone mostly unexplored. The grant will also provide partial support for training two graduate students. The participation of women and members of underrepresented groups will be facilitated through the Women's Engineering Program at University of California Berkeley and Notre Dame. The PIs will ensure the participation of undergraduates through the Undergraduate Research Opportunity Program at both Berkeley and Notre Dame.