This paper reviews the short history, motivation, numerical and theoretical issues, and
development of methods for treating a boundary as a reflective/absorptive surface for the …

Abstract The Lattice Boltzmann Method (LBM) can be applied to several fluid dynamic
problems in the time domain. This numerical method indirectly solves the Navier–Stokes …

An explicit solution is given of a pulse reflecting in time domain at a Helmholtz resonator
impedance wall that provides some insight into the reflection problem in time domain and at …

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; …

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

The modeling of a set of impedance values given either experimentally or heuristically for
implementation as a time-domain impedance-equivalent boundary condition (TDIBC) is …

A methodology to design broadband time-domain impedance boundary conditions (TDIBCs)
from the analysis of acoustical models is presented. The derived TDIBCs are recast …

Combustion instabilities are caused by the interaction of unsteady heat releases and
acoustic waves. To mitigate combustion instabilities, perforated liners, typically subjected to …

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 …

AEROENGINE noise reduction is, in today's turbine design, achieved principally by using
passive-acoustic treatments. Reductions of noise in the forward arc of aeroengines are …