Impact of Blockages Orientation onto the Vortex-Induced Vibration of Circular Cylinder
The vortex-induced vibration of an isolated circular cylinder has a wide range of engineering applications and for decades has been a subject of interest among researchers. Excessive vibration caused by vortex flows can decrease the life span of the structure elements if the excitation frequency generated by the aerodynamic effect is closed or coincides with the natural frequency of the structure. The vortex flow being investigated consists of a rigid circular cylinder with the presence of several rectangular blockages that are identical to the environment inside the governor valve system. The basic physical fluid in terms of the vortex shedding flow parameters and structural configuration of the blockages are numerically examined using the CFD at Reynolds number 200. This paper offers further insights into fluid physics, including the interactions of the vortex shedding processes due to the rectangular blockage orientation. The addition of rectangular blockages around a circular cylinder has significantly altered the oscillation range and magnitude of aerodynamics forces, lowered the rate of vibration, altered the structure of the wake behind the cylinders. This study results in a better understanding of vortex shedding of fluid physics and provides guidance for the installation of the valve and its cage for minimal flow-induced vibration generation.