Drag-reduction techniques capable of reducing the level of turbulent friction through wall-
parallel movement of the wall are described, with special emphasis placed on spanwise …

Over the last two decades, both experiments and simulations have demonstrated that
transverse wall oscillations with properly selected amplitude and frequency can reduce …

The use of dynamic roughness or small, oscillating, wall roughness elements to manipulate
the structure of turbulent boundary layers is reviewed with a view to imposing true active …

We study the evolution of velocity fluctuations due to an isolated spatio-temporal impulse
using the linearized Navier–Stokes equations. The impulse is introduced as an external …

We use the linearized Navier-Stokes equations to study the large-scale flow structures in
unstably stratified turbulent channel flows. The impulse response of the linear operator at …

We identify a benchmark problem simple enough that it can be solved both by an eddy-
viscosity model and by direct numerical simulation: this is the linear response of a turbulent …

We study the correlation function and mean linear response function of the velocity Fourier
mode of statistically steady-state, homogeneous and isotropic turbulence in Eulerian and …

Spatial evolution of small perturbations introduced into an inlet cross-section of fully
developed turbulent flow in a long straight circular pipe is investigated via direct numerical …

Eigenmodes of averaged small-amplitude perturbations to a turbulent channel flow–which is
one of the most fundamental canonical flows–are identified for the first time via an extensive …

CPL here stands for a computer programming language conceived and developed by the
author since 1993, but published for the first time in 2020. It was born as a Compiled …