Nonlinear vortex dynamic analysis of flow-induced vibration of a flexible splitter plate attached to a square cylinder. (15th November 2022)

• Record Type: Journal Article
• Authors: Xu, Bin; Wang, Hao; Deng, Yilin; Shen, Xi; Geng, Linlin; Liu, Keyang; Zhang, Desheng
• Is Part Of: Ocean engineering. Volume 264(2022)
• Publication Date: 2022-11-15
• Subjects: Fluid structure interaction -- Vortex identification -- Flow-induced vibration -- Vortex dynamic analysis -- Vorticity transport equation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2022.112433
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Flow-induced vibration (FIV) of a flexible splitter plate attached to a square cylinder in laminar flow is investigated using a two-way fluid-structure interaction (FSI) simulation. The Reynolds number based on the edge length of the square cylinder is fixed at Re = 332.6. Numerical results show that the vortex structure falling off on both sides of the square cylinder will excite the vibration of the flexible plate. There is a noticeable phase difference between the flexible plate's hydrodynamic load (lift) and the vertical vibration displacement of the end of the plate. It is also found that there is a pronounced hysteresis effect on the vortex shedding on both sides of the square cylinder due to the action of the flexible plate. The viscous dissipation term dominates the vorticity transport in low Reynolds number flow regimes. The viscous dissipation term reflects the flow trend of the flow field to a certain extent. The results obtained are insightful to the design of FSI-based ocean engineering structures using flexible plates. Highlights: A detailed investigation of nonlinear vortex dynamics was presented. The new omega vortex identification method is performed to identify the vortex structures properly. The vibration characteristics of the flexible plate and its relationship with the hydrodynamic load are analyzed, and the first-order bending vibration mode of the flexible plate under the action of the flow field is pointed out. The relationship between the viscous dissipation term at low Re and the flow characteristics is discussed.