Center for Metamaterials and Integrated Plasmonics, Pratt School of Engineering, Duke University, Durham, North Carolina 27708, USA.
Phys Rev Lett. 2011 Aug 12;107(7):074501. doi: 10.1103/PhysRevLett.107.074501. Epub 2011 Aug 11.
We introduce a new concept for the manipulation of fluid flow around three-dimensional bodies. Inspired by transformation optics, the concept is based on a mathematical idea of coordinate transformations and physically implemented with anisotropic porous media permeable to the flow of fluids. In two situations-for an impermeable object placed either in a free-flowing fluid or in a fluid-filled porous medium-we show that the object can be coated with an inhomogeneous, anisotropic permeable medium, such as to preserve the flow that would have existed in the absence of the object. The proposed fluid flow cloak eliminates downstream wake and compensates viscous drag, hinting at the possibility of novel propulsion techniques.
我们提出了一种用于操纵三维物体周围流体流动的新概念。受变换光学的启发，该概念基于坐标变换的数学思想，并通过对流体可渗透的各向异性多孔介质来物理实现。对于放置在无粘自由流或充满流体的多孔介质中的不可渗透物体这两种情况，我们展示了可以用非均匀各向异性可渗透介质来涂覆物体，以保持在没有物体存在时的流动。所提出的流体流动斗篷消除了下游尾流并补偿了粘性阻力，暗示了可能有新的推进技术。
