When the pressure fluctuations caused by turbulence vorticity in the boundary layer are
scattered by a sharp trailing edge, acoustic energy is generated and propagated to the far …

▪ Abstract We review the experimental evidence on turbulent flows over rough walls. Two
parameters are important: the roughness Reynolds number ks+, which measures the effect …

The interaction of the overlying turbulent flow with riblets, and its impact on their drag
reduction properties are analysed. In the so-called viscous regime of vanishing riblet …

We study the temporal stability of the Orr–Sommerfeld and Squire equations in channels
with turbulent mean velocity profiles and turbulent eddy viscosities. Friction Reynolds …

The interaction of the overlying turbulent flow with a riblet surface and its impact on drag
reduction are analysed. The 'viscous regime'of vanishing riblet spacing, in which the drag …

Results are presented from an experimental study of shallow flow in a channel partially
obstructed by an array of circular cylinders. The cylinder array is a model for emergent …

A lattice-Boltzmann method has been employed to study the aeroacoustics and
aerodynamics of airfoils equipped with leading edge treatments, namely the porous leading …

Open-cell porous materials have been reported as a promising concept for mitigating
turbulent boundary-layer trailing-edge noise. This manuscript examines the aeroacoustics of …

The effect of the variations of the permeability tensor on the close-to-the-wall behaviour of a
turbulent channel flow bounded by porous walls is explored using a set of direct numerical …

The paper presents the analytical review of the current state of the investigations and
development trends on the problem of turbulent friction and aerodynamic drag reduction in …