Abstract
Vortex shedding phenomenon behind bluff bodies and its destructive unsteady wake can be controlled by employing active and passive flow control methods. In this quest, researchers employed experimental fluid dynamics (EFD), computational fluid dynamics (CFD) and an analytical approach to investigate such phenomena to reach a desired outcome. This study reviews the available literature on the flow control of vortex shedding behind bluff bodies and its destructive wake through the modification of the geometry of the bluff body. Various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder have been reviewed. The effectiveness of these methods has been discussed in terms of drag variation, wake structure modifications and Strouhal number alteration.
Highlights
Flow properties and wake structures in the premises of bluff bodies fascinates many researchers for years
This paper envisages to review the suppression of vortex shedding through various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder in a compact form
The results demonstrated that a value of 0.4 ≤ diameter to the inner cylinder diameter (D/d) ≤ 0.6 and 1.6 ≤ D/d ≤ 2.0 would achieve a better flow control in the near wake with a remarkable reduction in the turbulent kinetic energy peak value
Summary
Flow properties and wake structures in the premises of bluff bodies fascinates many researchers for years. The periodic phenomenon incurs destructive unsteady loading on the structure and may lead to catastrophic incidents Preventing such destructive fluctuating forces requires a better understanding of this phenomenon during design stages of industrial systems. Eng 2021, 2 the understanding of the shedding phenomenon for design stages They investigated different features of vortex shedding, wake flow structure, Strouhal number variation and other aerodynamic parameters. The fluctuating forces are derived from the wake structure and any endeavor for the suppression of the vortex street to reduce such destructive features is valuable For this purpose, various passive and active flow-control methods have been employed by engineers to protect the structures against the damaging fluid forces acting on the bluff bodies. This paper envisages to review the suppression of vortex shedding through various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder in a compact form
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