Abstract
In order to reduce the aerodynamic noises induced from a pantograph contact shoe, flow control over the contact shoe is needed. There are various kind of flow control method, passive and active control method. In this study, flow around a square cylinder controlled by plasma actuators is numerically investigated by means of direct numerical simulation(DNS). The square cylinder is assumed to have plasma actuators on the rear surface and Reynolds number is set at 100. Three different different actuation input are investigated. Reduction of the drag coefficient C_D and the lift coefficient fluctuations C'_L is observed. The suppression of vortex shedding is also observed due to a weakened interaction between two shear layers behind the cylinder. The flows induced by two actuators interact at the mid-section of the rear surface and generate the streamwise jet, which weakens the interaction between two shear layers.
