Suppression of fluid forces acting on two square prisms in tandem arrangement by passive control

The aim of the present study is to suppress the fluid forces acting on two square prisms in tandem arrangement, which is found in many cases in structures on land and in the ocean, by exerting passive control on an approaching flow using a small flat plate. The position of the control plate and spacing between two prisms are systematically varied, and then the reduction of the time-averaged and fluctuating fluid forces acting on two square prisms is determined. In addition, the mechanism of the flow control, the structure of the controlled wake, and the behavior of the controlled surroundings flow are discussed in detail based on the surface pressure distributions, the fluid foces and the visualized surface flow patterns.