EAGER: Collaborative Research: Cloaking in stratified fluids

PI：Alam，M. - Reza/Ardekani，Arezoo提案编号：1414579/1414581机构：加州大学伯克利分校标题：EAGER：合作研究：分层流体中的隐身拟议研究的目的是探索开发和部署相当于“隐形斗篷”的可能性，以使浮动风能收集涡轮机对海洋表面波不可见。由超材料制成的隐身衣被认为是21世纪世纪前十年固体物理学、光学和声学的十大重大发现之一，但现在这是在流体力学和水波的背景下讨论的。智力价值当表面波绕过物体时，可以实现水面物体的隐身衣，就好像物体不存在一样，也就是说，当没有衍射时。这种隐身的一个重要结果是，隐身区域中的浮动结构和物体将受到保护，免受强大的入射表面波的影响。拟议中的研究将采取第一步进入这一领域的流体力学的背景下，通过使用相结合的理论，计算和实验方法。 该研究的重点是浮力跳跃（典型的海洋和湖泊）的影响，粘性，惯性，扩散，以及海底地形的不均匀性对隐形在尖锐和连续分层流体。更广泛的影响该研究计划可以导致设计新的策略，以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）从海浪的破坏性影响。在这项工作中，基本流体力学将被用来扩大这一领域的水生科学和海洋学。拟议的研究具有潜在的变革性，因为流体力学的这一领域迄今为止大部分尚未探索。这笔赠款还将为培训两名研究生提供部分支助。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。PI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.