Attenuating surface gravity waves with mechanical metamaterials

Metamaterials and photonic/phononic crystals have been successfully developed in recent years to achieve advanced wave manipulation control, both electromagnetism mechanics. However, the underlying concepts are yet be fully applied field of fluid dynamics water waves. Here, we present an example interaction surface gravity waves with a mechanical metamaterial, i.e. periodic underwater oscillating resonators. In particular, study device composed by array submerged harmonic oscillators whose objective is absorb energy dissipate it inside form heat. The performed using state art direct numerical simulation Navier-Stokes equation its two-dimensional free boundary moving bodies. We use Volume Fluid interface technique for tracking Immersed Boundary method fluid-structure interaction. first monochromatic single oscillator then add up four resonators coupled only fluid-mechanically. efficiency terms total dissipation find that adding resonators, increases non trivial way. As expected, large attenuation achieved when characterised similar frequencies. number increased, range attenuated frequencies also increases. concept results presented herein relevance applications coastal protection.