The Effect of Grooves and Permeable Plates on the Control of Vortex Shedding Behind a Single Circular Cylinder

Abstract

Two permeable plates and two longitudinal grooves are proposed to control the vortex shedding behind a circular cylinder at Reynolds number Re=100. This passive control method constitutes a new alternative to reduce the drag and lift forces using a shorter splitter plate. The unsteady fluid flow is unconfined and governed by the two-dimensional Navier-Stokes equations.These governing equations are solved bythefinite volume method with the higher-order QUICK scheme (Quadratic Upstream Interpolation for Convective Kinematics) for the convection fluxes.The numerical model was validated for isolated cylinder at Re=20 (steady flow) and Re=100 (unsteady flow) and well agreement was found in terms ofthe global and flow characteristics along the cylinder wall. The numerical results show that the periodic vortex shedding is well reproduced without introducing any physical perturbation. Compared to the isolated cylinder, the simulated results show that the vortex shedding is considerably reduced under the effect of two grooves and two permeable plates. The drag coefficient is reduced by 19% and the amplitude of fast Fourier transform (FFT) of the lift coefficient signal is considerably reduced. The porosity is taken equal to =0.22 and the length of the two plates is equal to one diameter of the cylinder.