Numerical prediction of vortex-induced vibration of flexible riser with thick strip method

Bao, Yan; Zhu, Hongbo; Peng, Huan; Wang, R.; Zhou, Dai; Han, Zhaolong; Palacios, Rafael; Graham, Michael I.; Sherwin, Spencer J.

doi:10.1016/j.jfluidstructs.2019.02.010

Cited by 28 publications

(9 citation statements)

References 23 publications

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“…(2016) and Bao et al. (2019) also use a periodic spanwise condition for thick strips modelling long circular cylinders.…”

Section: Problem Formulationmentioning

confidence: 99%

“…This choice is made to avoid the artificial high intensity turbulence enhancements and the deterioration of the 2-D behaviour of the flow when a no-penetration condition is enforced on the constricting planes, as noted on Biancofiore, Gallaire & Pasquetti (2012) for obstacle-free turbulent wakes. Other studies such as Bao et al (2016) and Bao et al (2019) also use a periodic spanwise condition for thick strips modelling long circular cylinders. The governing equations are numerically solved in a discrete rectilinear grid (details in § 2.2).…”

Section: Problem Formulationmentioning

confidence: 99%

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Span effect on the turbulence nature of flow past a circular cylinder

et al. 2019

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Turbulent flow evolution and energy cascades are significantly different in two-dimensional (2-D) and three-dimensional (3-D) flows. Studies have investigated these differences in obstacle-free turbulent flows, but solid boundaries have an important impact on the cross-over from 3-D to 2-D turbulence dynamics. In this work, we investigate the span effect on the turbulence nature of flow past a circular cylinder at $Re=10\,000$. It is found that even for highly anisotropic geometries, 3-D small-scale structures detach from the walls. Additionally, the natural large-scale rotation of the Kármán vortices rapidly two-dimensionalise those structures if the span is 50 % of the diameter or less. We show this is linked to the span being shorter than the Mode B instability wavelength. The conflicting 3-D small-scale structures and 2-D Kármán vortices result in 2-D and 3-D turbulence dynamics which can coexist at certain locations of the wake depending on the domain geometric anisotropy.

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“…(2016) and Bao et al. (2019) also use a periodic spanwise condition for thick strips modelling long circular cylinders.…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

Span effect on the turbulence nature of flow past a circular cylinder

et al. 2019

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“…The thick strip model solves disadvantages of the traditional 2D strip model through considering the local 3D features of the flow field in each thick strip. This method has been validated by Bao et al [8].…”

Section: Thick Strip Modelmentioning

confidence: 99%

Numerical simulations on VIV of a flexible cylinder under two degree-of-freedoms excitations

Deng¹,

Peng²

2022

Vib. proced.

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In deep sea oil exploitation, offshore structures subjected to winds, waves and currents will cause the connected flexible riser to oscillate in the water, which contributes to complicated Vortex-induced Vibration (VIV) phenomenon. In this paper, VIV of a flexible cylinder under two degree-of-freedoms (Dofs) excitations are mainly investigated. All simulations are carried out by the viv3D-FOAM-SJTU solver, which is developed based on the open-source code OpenFOAM and the thick strip model. During the simulations, the flexible cylinder is forced to sinusoidally oscillate following the approximate “8” shape of trajectory, while the cylinder is allowed to vibrate in both directions. Modal decomposition method and wavelet transformation method are used to get the dominant vibration features of the cylinder. Variations on vortex structures of the cylinder are analyzed through the three-dimensional visualization method.

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“…They remarked that the vibrations can considerably alter the flow structure over the cable structure. Bao et al [34] The details of the generated mesh for polynomial order (P) of 6 over the blade cascade are shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%