Fig. 1: Potential applications, schematic diagram, and zero-drag characteristics of the proposed hydrodynamic cloaks.
From: On-demand zero-drag hydrodynamic cloaks resolve D'Alembert paradox in viscous potential flows
a Potential application of hydrodynamic zero-drag cloaks upon mutual hydrodynamic interactions between intrusive objects and peripheral environments are eliminated. b Two-dimensional model of elliptical hydrodynamic cloaks, where ξ1 and ξ2 indicate the geometric parameters of the object (region I) and cloaks (region II), and both of them are horizontally located, steadily immersed in a freestream (region III). c Drag of the cloak wrapped around the object (red line), drag of the object existence only (black line), and drag-reduction effects (cyan line) vary with various Re’s. Hydrodynamic cloaks that can be switched on and off at will are seen in the supplemental video
