Applying Suction and Blowing Flow Control Approaches to Reduce the Flow-induced Instabilities of Elastically-mounted Square Cylinder

علوم کاربردی و محاسباتی در مکانیک

Article 3, Volume 34, Issue 2 - Serial Number 28, August 2022, Pages 29-44   

Document Type: Original Article

DOI: 10.22067/jacsm.2022.69475.1017

Authors

Amir hossein Rabiee^{* 1}; Mohammad Reza Barzan²; Abolfazl Mohammad Ebrahim²

¹School of Mechanical Engineering, Arak University of Technology

²Mechanical Engineering Department, Arak University of Technology, Arak, Iran.

Abstract

Flow-induced instabilities are one of the major challenges in the design of aerospace structures. Numerous passive and active control methods have been used to reduce the flow-induced oscillations of square cross-section cylinder as the basic geometry for structures with sharp corners. The suction and blowing flow control method are one of the most effective approaches for controlling the flow and consequently reducing the vibrations resulting from the aerodynamic forces, which so far are not considered for an elastically-mounted square cylinder which fluctuates freely in the transverse direction. Therefore, in this paper, suction and blowing flow control methods have been used separately to suppress flow-induced oscillations. In the suction-based method, a slut is placed on the front surface of the cylinder and in the blowing-based method another slot is inserted on the back surface of the cylinder. In the present study, the effect of suction and blowing velocities as well as the effect of suction and blowing slut lengths on the efficiency of the flow control approach was evaluated. According to the flow-structure interaction simulations, it is observed that the applied flow control method has been able to reduce flow-induced vibrations appropriately.

Keywords

Flow-induced vibration; Vortex shedding; Flow control; Galloping; Square geometry

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