Deep reinforcement learning (DRL) has been applied to a variety of problems during the
past decade and has provided effective control strategies in high-dimensional and non …

The quest for reductions in fuel consumption and CO 2 emissions in transport has been a
powerful driving force for scientific research into methods that might underpin drag-reducing …

Transient growth and resolvent analyses are routinely used to assess nonasymptotic
properties of fluid flows. In particular, resolvent analysis can be interpreted as a special case …

Direct numerical simulations of the incompressible Navier–Stokes equations are employed
to study the turbulent wall-shear stress in a turbulent channel flow forced by lateral …

This paper reviews turbulent boundary-layer control strategies for skin-friction reduction of
aerodynamic bodies. The focus is placed on the drag-reduction mechanisms by two flow …

We present an experimental study of a turbulent boundary layer (TBL) control on a flat plate
using plasma actuators. Three different configurations of the actuators produce spanwise …

Direct numerical simulations for fully developed channel flow, subjected to oscillatory
spanwise wall motion, have been performed and analysed in an effort to illuminate the …

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 …

Steady forcing at the wall of a channel flow is studied via direct numerical simulation to
assess its ability of yielding reductions in turbulent friction drag. The wall forcing consists of a …

This paper considers plane channel flow modified by waves of spanwise velocity applied at
the wall and travelling along the streamwise direction. Both laminar and turbulent regimes …