Control of vortex-induced vibrations of the cylinder by using split-ter plates immersed in the cylinder wake at low Reyn
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Available online at https://link.springer.com/journal/42241 http://www.jhydrodynamics.com Journal of Hydrodynamics, 2020, 32(5): 942-952 https://doi.org/10.1007/s42241-020-0063-8
Control of vortex-induced vibrations of the cylinder by using split-ter plates immersed in the cylinder wake at low Reynolds number * Zhi-qiang Xin1, Zhi-huang Wu1, Chui-jie Wu2, Dan Huang1 1. The College of Mechanics and Materials, HoHai University, Nanjing 211100, China 2. State Key Laboratory of Structural Analysis for Industrial Equipment and School of Aeronautics and Astronautics, Dalian University of Technology, Dalian, China (Received July 31, 2019, Revised September 16, 2019, Accepted September 19, 2019, Published online October 29, 2020) ©China Ship Scientific Research Center 2020 Abstract: The vortex-induced vibrations of a cylinder with two plates symmetrically distributed along the centerline of the wake are studied by using the fluid-structure interaction simulations on the Arbitrary Lagrangian-Eulerian method. In this study, the different geo-metrical distribution parameters of the splitter plates and inflow velocities are taken into account. The physical mechanisms of vortex-induced vibration of the cylinder with symmetrical plates are revealed from the cylinder amplitude, hydrodynamic force characteristics, vortex shedding frequency, and flow pattern modification. The results show that the dynamic interaction between the vortex shed from the oscillation cylinder and plates is responsible for the wake stabilization mechanism, and the stable wake and the dynamic response reduction of the main cylinder can be achieved at a wide range of reduced velocities by placing sym-metrical sheets at suitable locations. Key words: Cylinder, vortex-induced vibrations, splitter plates, vibration control, flow pattern
Introduction Vortex-induced vibration (VIV) is a common phenomenon in engineering and in nature. It has been found that the onset of vortex shedding which is responsible for the structural vibration is triggered when the Reynolds number exceeds a critical value. Under specific flow and structure conditions, the existence of vortex-induced vibrations constitutes a widespread problem which is undesirable in many engineering applications. Therefore, developing effective control methods for suppression of vortexinduced vibrations has become an important research topic. There has been a wide scientific interest in VIV characterization and control[1-3]. Moreover, the flow mechanism of vortex-induced vibration and the distribution of vibration response branches was revealed detailed in the work of Mittal[4-5]. In order to reduce or completely suppress cylinder vibrations, * Project supported by the National Natural Science Foundation of China (Grant No.11872174). Biography: Zhi-qiang Xin (1981-), Male, Ph. D., Assistant Professor, E-mail: [email protected] Corresponding author: Dan Huang, E-mail: [email protected]
different means have been proposed, which can be generally classified into passive control without power input
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