The walls of ducts containing flow are often acoustically lined in order to reduce sound.
Many simple models of acoustic linings assume the lining to be linear and locally reacting; …

Time-domain impedance boundary conditions are reviewed and similarities between the
models are shown. The extended Helmholtz resonator model is used with a time-domain …

The acoustical behavior and the flow in a rectangular lined channel with grazing flow have
been investigated. The liner consists of a ceramic structure of parallel square channels and …

An experimental investigation of the acoustical behaviour of a liner in a rectangular channel
with grazing flow has been conducted. The liner consists of a ceramic structure of parallel …

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 …

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 …

Acoustic liners are used to absorb sound waves in ducts with flow. These liners can become
unstable and some experiments have shown that in this case they do not damp sound as …

Numerical simulations of a compressible turbulent channel flow with an acoustic impedance
boundary condition are performed to assess how the flow is modified compared with a …

Lined ducts are used to reduce noise radiation from ducts in turbofan engines. In certain
conditions they may sustain hydrodynamic instabilities. A local linear stability analysis of the …