Fast-swimming sharks have scales with microgrooves called riblets aligned in the direction
of fluid flow. Riblets result in water moving efficiently over the surface. In previous …

It was believed that fluid flow and the laminar to turbulent transition delay were more easily
controlled on smooth surfaces until the discovery of the grooved shark skin surface that …

In this study, the flap and vortex generator (VG) mechanisms which were employed
separately in aircraft were used as integrated first in literature. In this mechanism, the flap …

The present paper describes the effect of drag reduction of circular cylinders due to a porous
coating on their leeward sides. To investigate the coating effect, experiments were …

Arrays of shallow dimples with depth to diameter ratios of 1.5% and 5% are studied in a
turbulent channel flow at Reynolds numbers between 5000 and 35 000. Pressure …

Optimal shapes of laminar, drag reducing longitudinal grooves in a pressure driven flow
have been determined. It has been shown that such shapes can be characterized using …

We show that a rather simple, steady modification of the streamwise velocity profile in a pipe
can lead to a complete collapse of turbulence and the flow fully relaminarizes. Two different …

The flow around a single circular cylinder modified by the Dielectric Barrier Discharge (DBD)
plasma actuator is investigated experimentally at a Reynolds number Re= 5.25× 10 3. The …

Flow control with the goal of reducing the skin-friction drag on the fluid–solid interface is an
active fundamental research area, motivated by its potential for significant energy savings …

The flow development in a groove-modified channel consisting of flat and grooved walls was
investigated by direct numerical simulations based on the Navier–Stokes equations at a …