Near-Wall Turbulence Control

Abstract

The control of near-wall turbulence is the topic of this contribution to the shortcourse volume on Flow Control. Turbulent boundary layer structure and near-wall turbulence structure in particular is considered and how passive and active modifications to the structure can produce a diminution in drag. This contribution examines various methods for passive and active control of these structures, which include riblets, humplets, spanwise wall oscillations, selective interference and selective introduction of turbulence at scales different to those already existing within a boundary layer.