Control of laminar vortex shedding behind a circular cylinder using splitter plates

Abstract

Laminar vortex shedding behind a circular cylinder and its control using splitter plates attached to the cylinder are simulated. The vortex shedding behind a circular cylinder completely disappears when the length of the splitter plate is larger than a critical length, and this critical length is found to be proportional to the Reynolds number. The Strouhal number of the vortex shedding is rapidly decreasing with the increased plate length until the plate length (l) is nearly the same as the cylinder diameter (d). On the other hand, at 1Ͻl/dϽ2, the control shows two different behaviors for the Reynolds numbers investigated. The net drag is significantly reduced by the splitter plate, and there exists an optimum length of the plate for minimum drag at a given Reynolds number. From an examination of the instantaneous flow fields, it is found that the Strouhal number modification by the splitter plate is closely related to the size of the primary vortex behind the cylinder and the length of the plate.

Direct Aeroacoustic Simulation with Volume Penalization Method

“…[9]). The amplitude of the fluctuations of the lift coefficient is 0.44, which is slightly lower than the value predicted in the past studies (0.52 at Re = 150 in the literature [5]; 0.48 at Re = 140 Kwon and Choi [10]). The time-averaged drag coefficient C D,ave predicted in the present computation is 1.27, which is approximately in good agreement with the value in the literature, C D,ave = 1.34 [5].…”

Investigation of Effect of Boundary Layer on Flow Structure Around a Cylinder with a Strip

“…[2]Gerrard [3]investigated the effect of length of splitter plate, attached to the circular cylinder, on the wake flow characteristics. He showed that the Strouhal number decreased when the splitter plate length was smaller than the cylinder diameter, but it increased for 1<L/D<2.Kwon and Choi [4] conducted a numerical study on the control of vortex shedding in laminar flow downstream of the circular cylinder using splitter plates. They pointed out that the vortex shedding downstream of the circular cylinder completely disappears when the length of the splitter plate is longer than a critical length, which is found to be proportional to the Reynold number.Akilli and Rockwell [5] investigated the vortex formation in the junction of the flat plate andcircular cylinder in shallow water flow, using dye visualization and particle image velocimetry (PIV) techniques.…”

Multiscale Modeling of Multiphase Fluid Flow

“…Vortex shedding is associated with temporally unstable eigenmodes which are heavily weighted by the near field [263]. Kwon et al [264] used splitter plates to control the laminar vortex shedding behind a circular cylinder. They found that the vortex shedding completely disappeared when the length of the splitter plate is larger than a critical length.…”