Figure 2
From: 3D-printed sound absorbing metafluid inspired by cereal straws
Schematic of the idealised metafluid inspired by cereal straws. (a) Representation of the \({\rm{\Omega }}\)-periodic arrangement of the double Quarter-Wavelength Resonators (QWRs) elements. (b) Details of the unit cell. (c) Details of the QWR opening. (d) Zoom at the corrugation of the walls.
