Feedback Control of Karman Vortex Shedding behind a Circular Cylinder by Velocity Excitation

Shinji HIEJIMA, Tadashi WATANABE, Takashi NOMURA
2004 Journal of Applied Mechanics  
A feedback control technique of vortex shedding behind a circular cylinder is investigated through two-dimensional numerical simulations. In order to suppress the vortex shedding, periodic velocity excitation is applied from the cylinder surface to the separated shear flows with a time delay and feedback gain for the fluid velocity behind the cylinder or pressure on the cylinder surface. It is shown that the feedback excitation generated by the velocity feedback method can suppress the vortex
more » ... edding considerably with appropriate time delay and feedback gain. However, the control effect is lower if the sensor is located downstream of the formation region of the vortices behind the cylinder. And the control using the pressure feedback method cannot suppress the vortex shedding effectively because of the unsteadiness of the pressure fluctuation on the cylinder surface.
doi:10.2208/journalam.7.1125 fatcat:errpho5gj5fvjoxtdpn2c5roty