In principle, the impedance of a locally reacting acoustic liner should be independent of the
structure of the sound field above the liner. Some experimental studies, however, have …

This paper presents a two-dimensional (2-D) cavity-by-cavity description of a convective
instability near a lined wall with low dissipation due to the coupling of hydrodynamic modes …

With flow, the acoustic effect of a locally reacting lined wall cannot be described by a single
quantity independent of the incident wave, such as a wall impedance. At least two quantities …

The effect of viscosity and thermal conduction on the acoustics in a shear layer above an
impedance wall is investigated numerically and asymptotically by solving the linearised …

A liners are passive control devices used to damp noise caused by fans, compressors or
turbines [1]. They reduce noise by dissipating the sound wave energy. The simplest acoustic …

View Video Presentation: https://doi. org/10.2514/6.2021-2169. vid High-fidelity lattice-
Boltzmann very-large-eddy simulations have been carried out to investigate the behaviour of …

The presence of sheared grazing flow changes the acoustic absorption of a lined surface.
Since acoustic waves are refracted through the boundary layer between the lined surface …

Acoustic metasurfaces are mostly designed in a static medium, ignoring the influence of flow
characteristics. However, in actual aeroacoustic noise reduction, eg, aircraft engine liner …

To explain the large-scale hydrodynamic instability along a cavity-backed perforated plate in
a flow duct, a two-dimensional multimodal analysis of flow disturbances is performed. First, a …

The attenuation of a plane acoustic wave incident on a flat impedance surface in a sheared
and viscous fluid is investigated numerically and asymptotically. Predictions of various …