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 …

The accuracy of existing impedance boundary conditions is investigated, and new
impedance boundary conditions are derived, for lined ducts with inviscid shear flow. The …

The effect of flow over an acoustic liner is generally described by the Myers impedance
condition. The use of this impedance condition in time-domain numerical simulations has …

A study is made of acoustic duct modes in two-dimensional and axisymmetric three-
dimensional lined ducts with an isentropic inviscid transversely nonuniform mean flow and …

A straight cylindrical duct is considered containing an axial mean flow that is uniform
everywhere except within a boundary layer near the wall, which need not be thin. Within this …

DNS solutions for a pipe/jet configuration are re-computed with the pipe alone to investigate
suppression of previously identified internal noise source (s) with an acoustic liner, using a …

A time-domain boundary condition is derived that accounts for the acoustic impedance of a
thin boundary layer over an impedance boundary, based on the asymptotic frequency …

Acoustics are considered in a straight cylindrical lined duct with an axial mean flow that is
uniform apart from a boundary layer near the wall. Within the boundary layer, which may or …

The acoustics of a mean flow boundary layer over an impedance surface or acoustic lining is
considered. By considering a thick mean flow boundary layer (possibly due to turbulence) …

A weakly viscous mean flow boundary layer is sandwiched between an inviscid outer flow
and a viscous sublayer to form an asymptotic patchwork model for ducted acoustics in shear …