8.1 Regular Perturbations 8.1. 1 Webster's horn equation 8.2 Multiple scales......... 8.3
Helmholtz resonator with non-linear dissipation 8.4 Slowly varying ducts......... 8.5 Reflection …

The paper is about the sound produced as turbulence impinges on the leading edge of an
airfoil and its reduction by means of either leading-edge serrations (tubercles) or the use of …

MODERN turbofan aeroengines almost universally use acoustic linings within the intake and
bypass ducts to reduce noise. Simple mathematical models in simple geometries and more …

In a duct of constant cross section, with a medium and boundary conditions independent of
the axial position, the wave equation for time-harmonic perturbations may be solved by …

We have performed large-eddy simulations of isothermal-wall compressible turbulent
channel flow with linear acoustic impedance boundary conditions (IBCs) for the wall-normal …

Acoustic metasurfaces (AMs) can manipulate acoustic waves in ways that are not reachable
in natural materials, offering significant implications for engineering applications such as …

Acoustic liners remain a key technology for reducing community noise from aircraft engines.
The choice of optimal impedance relies heavily on the modeling of sound absorption by …

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 …

Trapped waves in supersonic and hypersonic turbulent channel flow over porous walls Page 1
J. Fluid Mech. (2021), vol. 920, A24, doi:10.1017/jfm.2021.428 Trapped waves in supersonic …

Acoustics within mean flows are governed by the linearized Euler equations, which possess
a singularity wherever the local mean flow velocity is equal to the phase speed of the …