On the Suppression of Vortex Shedding From Circular Cylinders Using Detached Short Splitter-Plates

Abstract

Flow over a circular cylinder with detached short splitter-plates is numerically simulated in order to assess the suppression of periodic vortex shedding. A finite-volume solver based on the Cartesian-staggered grid is implemented, and the ghost-cell method in conjunction with Great-Source-Term technique is employed in order to enforce directly the no-slip condition on the cylinder boundary. The accuracy of the solver is validated by simulation of the flow around a single circular cylinder. The results are in good agreement with the experimental data reported in the literature. Finally, the flows over a circular cylinder with splitter-plate in its downstream (off and on the centerline) are computed in Re=40 as a nonvortex shedding case and in Re=100 and 150 as cases with vortex shedding effects. The same simulations are also performed for the case where dual splitter-plates are in a parallel arrangement embedded in the downstream of the cylinder. The optimum location of the splitter-plate to achieve maximum reduction in the lift and drag forces is determined.

Numerical investigation of flow around circular cylinder with splitter plate

“…When the vortex shedding disappears, the fluctuation of lift force is also suppressed (Dehkordi and Jafari, 2010). In other words, the fluctuation of the lift force coefficient confirms the existence of periodic vortex shedding behind the cylinder.…”

“…The lift force, which is in the transverse direction, has the same frequency as the vortex-shedding cycle, while the frequency of the drag force, which is in the stream direction, is twice of the vortex shedding frequency (Behzad and Hamed, 2010;Wanderley et al, 2002). The drag and lift force coefficients were shown to be continuous over time in Fig.…”

Effect of High Porosity Screen on the Near Wake of a Circular Cylinder

“…Therefore, many studies have been carried out in the past [1,2,3,5,6,7,9,10,12,13,14,16] to establish a method to control the vortex shedding which can be observed easily when fluid flows over a bluff body. A classification may be done by dividing the control methods into two categories, namely passive and active flow control.…”

Active Control of Flow-Induced Acoustic Resonance Through Surface Perturbation

“…Flow-induced vibrations can be controlled using either passive or active means [4]. Passive techniques require no energy input, exemplified by surface modifications with roughness [5], splitter plates [6,7], detached plates [8,9], and small secondary control cylinders [10]. Active control methods, however, require energy input via actuators to bring about desirable changes in the shear flow and subsequently alter the flow system.…”