In this work, we demonstrate nonreciprocal acoustic wave transmission in two-cascaded Fabry-Perot-like slab resonators undergoing time modulation of their effective density. A phase difference is introduced into the between two coupled to produce spatial bias access unidirectional propagation. theoretical model based on plane-wave expansion and transfer-matrix method developed study Fabry-Perot...

We develop a novel Virtual Element Method (VEM) to resolve the mixed Biot displacement-pressure formulation governing wave propagation in porous media. Within this setting, weak form of equations is discretized using implicitly defined canonical basis functions and resulting integral forms are computed appropriate polynomial projections. The projection operator accounting for solid, fluid, coup...

The aim of this work is to accurately and efficiently predict sound radiation out of a duct with flow. The sound propagation inside a generic engine bypass duct, refractions by the shear layer of the exhaust flow, and propagation in the near field are the main focus of the study. The prediction uses either a modified form of linearized Euler equations or an alternative model based on acoustic p...