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• W2001639152 abstract "Two-degree-of-freedom vortex-induced vibrations (VIV) of a circular cylinder close to a plane boundary are investigated numerically. The Reynolds-Averaged Navier–Stokes (RANS) equations are solved using the Arbitrary Lagrangian Eulerian (ALE) scheme with a k–ω turbulence model closure. The numerical model is validated against experimental data of VIV of a cylinder in uniform flow and VIV of a cylinder close to a plane boundary at low mass ratios. The numerical results of the vibration mode, vibration amplitude and frequency agree well with the experimental data. VIV of a circular cylinder close to a plane boundary is simulated with a mass ratio of 2.6 and gap ratios of e/D=0.002 and 0.3 (gap ratio is defined as the ratio of gap between the cylinder and the bed (e) to cylinder diameter (D)). Simulations are carried out for reduced velocities ranging from 1 to 15 and Reynolds numbers ranging from 1000 to 15 000. It is found that vortex-induced vibrations occur even if the initial gap ratio is as small as e/D=0.002, although reported research indicated that vortex shedding behind a fixed circular cylinder is suppressed at small gap ratios (e/D<0.3 or 0.2). It was also found that vibration amplitudes are dependant on the bouncing back coefficient when the cylinder hits the plane boundary. Three vortex shedding modes are identified according to the numerical results: (i) single-vortex mode where the vortices are only shed from the top of the cylinder; (ii) vortex-shedding-after-bounce-back mode; (iii) vortex-shedding-before-bounce-back mode. It was found that the vortex shedding mode depends on the reduced velocity." @default.
• W2001639152 created "2016-06-24" @default.
• W2001639152 creator A5042535549 @default.
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• W2001639152 date "2011-10-01" @default.
• W2001639152 modified "2023-10-17" @default.
• W2001639152 title "Numerical simulation of two-degree-of-freedom vortex-induced vibration of a circular cylinder close to a plane boundary" @default.
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• W2001639152 doi "https://doi.org/10.1016/j.jfluidstructs.2011.07.001" @default.
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