Flow feature around an in-line forced oscillating circular cylinder with splitter plate in low reynolds number

In order to understand the flow feature around an in-line forced oscillating circular cylinder with splitter plate (splitter plate ratio SL/d = 2.0), numerical and visual experiments were performed. As a result, even if it was the case of circular cylinder with splitter plate, the lock-in phenomenon arises. The characteristics of fluid force and typical flow patterns were obtained. It was found that an existence of re-circulation flow supplied to the separating shear layer is important in formation of the vortex shedding flow.