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• W2621740437 abstract "Abstract The two-degree-of-freedom (2DOF) vortex-induced vibration (VIV) of a circular cylinder with varying in-line to cross-flow natural frequency ratios ( f ∗ = f n x ∕ f n y ) is studied using a three-dimensional (3D) computational fluid dynamics (CFD) approach. Numerical simulation is carried out for a constant mass ratio of 2 at a fixed Reynolds number Re = 500 . The reduced velocity ranges from 2 to 12. Three natural frequency ratios are considered, i.e., f ∗ = 1 , 1 . 5 and 2. The structural damping is set to zero to maximise the response of the cylinder. The main objective of this study is to investigate the effect of f ∗ on the 2DOF VIV responses and the 3D characteristics of the flow. It is discovered that there is a significant increase in the vibration amplitude, and the peak amplitude shifts to a higher reduced velocity when f ∗ increases from 1 to 2. A single-peak cross-flow response is observed for the identical in-line and cross-flow mass ratios when f ∗ = 2 . Dual resonance is found to exist over the range of f ∗ studied. The preferable trajectories of the cylinder in the lock-in range are counterclockwise figure-eight orbits. Oblique figure-eight trajectories appear at V r = 6 , 7 and 8 when f ∗ = 1 . The third harmonic component which is observed in the lift fluctuation increases with f ∗ . The correlation decreases in the lock-in range and reaches its minimum value around the transition region between the lock-in and post-lock-in ranges. Three vortex shedding modes (2S, P + S and 2P) appear in the present simulation. A dominant P + S mode is associated with the oblique figure-eight trajectories. Variation of vortex shedding flows along the cylinder is observed leading to the poor correlation of the sectional lift forces." @default.
• W2621740437 created "2017-06-15" @default.
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• W2621740437 date "2017-08-01" @default.
• W2621740437 modified "2023-10-18" @default.
• W2621740437 title "Three-dimensional numerical simulation of two-degree-of-freedom VIV of a circular cylinder with varying natural frequency ratios at<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si97.gif display=inline id=mml97 overflow=scroll><mml:mi mathvariant=normal>Re</mml:mi><mml:mo>=</mml:mo><mml:mn>500</mml:mn></mml:math>" @default.
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• W2621740437 doi "https://doi.org/10.1016/j.jfluidstructs.2017.06.001" @default.
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