Viscothermal Effects in a Two-Dimensional Acoustic Black Hole: A Boundary Element Approach

Abstract

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Tuning the decay of sound in a viscous metamaterial

“…In the limit where the separation between neighbouring rods is comparable to the thickness δ, the growth becomes extremely fast. This effect is of the same nature as the enhanced decay of sound propagating through narrow channels and holes [8][9][10][12][13][14][15]18,20,21].…”

“…Modern sound absorbers use innovative designs based on metamaterials. Artificial acoustic metamaterials can be used as structures to increase sound absorption to extents not achieved in natural materials [18,19]. In phononic metamaterials containing hard scatterers in a fluid background, viscous dissipation breaks the time-reversal symmetry, making the fluid dynamics irreversible and even non-reciprocal if mirror symmetry is also broken [20,21].…”