Assembling hydrodynamic cloaks to conceal complex objects from drag. (October 2020)

• Record Type: Journal Article
• Authors: Park, Juhyuk; Song, Young Seok
• Is Part Of: Journal of fluids and structures. Volume 98(2020)
• Publication Date: 2020-10
• Subjects: Fluid control -- Stokes flow -- Metamaterials -- Viscosity mapping -- Numerical simulation; Fluid-structure interaction -- Periodicals; Fluid mechanics -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.106
• DOI: 10.1016/j.jfluidstructs.2020.103136
• Languages: English
• ISSNs: 0889-9746

Abstract

Abstract: Transformation hydrodynamics and the corresponding metamaterials have been proposed as a means to exclude the drag force acting on an object. Here, we report a strategy to deploy the hydrodynamic cloaks in a more practical manner by assembling different-shaped cloaking parts. Our strategy is to first model a square-shaped cloak and a carpet cloak and then combine them to conceal a more complex-shaped space in the three-dimensional hydrodynamic flow. With the derivation of transformation hydrodynamics, the coordinate transformations for each hydrodynamic cloaking are demonstrated with the calculated viscosity tensors. The pressure and velocity fields of the square, triangular (carpet), and exemplary three-dimensional house-shaped cloaks are numerically simulated, thus showing a cloaking effect and reduced drag. This study suggests an efficient way of cloaking complex architectures from fluid-dynamic forces.