The coherent structures within the turbulent boundary layers have been investigated extensively over the past five decades. In particular, the long alternating low- and high speed streaks in the near-wall region. Along these streaks ejection and sweep events occur which play a major role in the production of Reynolds shear stress. Hence, studies on turbulent boundary layer control were focused on manipulating the low-speed streaks, to either reduce wall skin-friction by attenuating the streaks or by intensifying the streaks for separation control.

Vortex shedding occurs from commonly encountered objects in ows such as blunt and divergent (truncated) airfoil trailing edges [12], landing gear of aircraft [37], etc. In addition to undesired aero-elastic effects such as vortex-induced vibration and uctuating aerodynamic forces, tonal acoustic noise is emitted due to the regular and periodic nature of the shedding. With the aim of eliminating this emitted noise, an experimental study was carried out on a D-shaped bluff body model using appropriately designed and implemented plasma actuator configurations to achieve active three-dimensional vortex shedding suppression.