Numerical Study of Passive Flow Control Around a Rectangular Cylinder

The passive flow control was numerically studied for a two-dimensional rectangular cylinder. Several control means were proposed so far like a small obstacle placed in front of a rectangular cylinder. One of the present authors proposed to connect a front obstacle and a rectangular cylinder with a splitter plate. The controlled flow field was investigated by the Navier-Stokes equations with the modified LES turbulent model. The results were compared to a previous method and it was found that the improvements were achieved in the drag reduction.