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Keywords = deep-water jacket pipe

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12 pages, 11805 KiB  
Article
Influence of Vibration Dampers on the Vortex-Induced Force and Flow Characteristic of Deep-Water Jacket Pipe
by Chao Luo, Zhirong Wei, Jiajia Chen, Liqin Liu and Yongjun Yu
Appl. Sci. 2022, 12(20), 10219; https://doi.org/10.3390/app122010219 - 11 Oct 2022
Cited by 2 | Viewed by 1804
Abstract
Vibration dampers are widely used in power transmission line vibration reduction. In order to use them for wind-induced vortex-induced vibration (VIV) suppression of jacket pipes, the effect of the vibration dampers on the vortex-induced force is studied using the computational fluid dynamics (CFD) [...] Read more.
Vibration dampers are widely used in power transmission line vibration reduction. In order to use them for wind-induced vortex-induced vibration (VIV) suppression of jacket pipes, the effect of the vibration dampers on the vortex-induced force is studied using the computational fluid dynamics (CFD) method. The range of Reynolds numbers in simulations is in the critical interval, and the Reynolds-averaged Navier–Stokes (RANS) equations and shear stress transport (SST) k-ω turbulence model are used to calculate the pipe with vibration dampers. The lift coefficient of the pipe is reduced by about 65% after the vibration dampers are installed. The effect of vibration dampers on the lift force and drag force is little affected by the change of wind speed. The same number of vibration dampers are installed in two rows, and the vortex shedding frequency is reduced by about 16% compared with that for one row. The vibration dampers destroy the wake vortex of the high-velocity areas around the pipe, thereby reducing the pipe’s lift coefficient and the vortex-induced force. The vibration dampers have no obvious influence on the vortex far from the pipe. Full article
(This article belongs to the Topic Computational Fluid Dynamics (CFD) and Its Applications)
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15 pages, 5211 KiB  
Article
The Parameter Design of Nonlinear Energy Sink Installed on the Jacket Pipe by Using the Nonlinear Dynamical Theory
by Lianfeng Yang, Liqin Liu, Chao Luo, Yongjun Yu and Yiqun Chen
Appl. Sci. 2022, 12(14), 7272; https://doi.org/10.3390/app12147272 - 19 Jul 2022
Cited by 4 | Viewed by 1949
Abstract
The aim of this paper is to investigate the vibration suppression effect of a nonlinear energy sink (NES) on the wind-vortex-induced vibration of deep-water jacket pipes. Based on nonlinear dynamical theories, the coupled dynamic equation of a deep-water jacket pipe with NES was [...] Read more.
The aim of this paper is to investigate the vibration suppression effect of a nonlinear energy sink (NES) on the wind-vortex-induced vibration of deep-water jacket pipes. Based on nonlinear dynamical theories, the coupled dynamic equation of a deep-water jacket pipe with NES was established, and the nonlinear response characteristics and motion stability of the system were studied by using the multi-scale mixed harmonic balance method and Routh–Hurwitz criterion. The paper also analyzed the influence of the nonlinear stiffness and damping parameters of an NES on the dynamic response of the pipe. It is concluded that when the nonlinear stiffness of an NES increases to a certain extent, the motion response of the pipe appeared as a saddle-node and Hopf bifurcation, and the vibration amplitude of the pipe is greatly suppressed. For a system with nonlinear motion, NES damping mainly affects the range of the unstable region. For the system without nonlinear motion, the increases in NES damping will reduce the amplitude near the resonance region. Selecting proper parameters of an NES nonlinear stiffness and damping can effectively suppress the vortex-induced vibration of pipes. Full article
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