Investigation on the flow-induced vibration of tandem cylinders with varying diameters at subcritical Reynolds numbers

Wang, Lin; Lei, Lijun; Ma, Tianjiao; Zheng, Kaijie; Guo, Junyu

doi:10.1016/j.apor.2023.103669

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…Due to seawater erosion, gaps can be formed between the subsea pipeline and the seabed, resulting in cantilevered cylindrical structures. Under the action of the ocean current, the periodic vortex-shedding phenomenon will occur behind the submarine pipeline, which can induce fatigue failure, thereby reducing the operational longevity of the pipeline [3]. In addition, the existence of the seabed and the hydrodynamic interference between adjacent pipelines can have severe influences on the wake mode and dynamic response patterns of the cylinders.…”

Section: Introductionmentioning

confidence: 99%

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

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To clarify the hydrodynamic interference characteristics of flows around multiple cylinders under the wall effect, the two-dimensional (2D) flows around the near-wall single, two tandem and parallel cylinders are simulated under different gap ratios (0.15 ≤ G/D ≤ 3.0) and spacing ratios (1.5 ≤ T/D ≤ 4.0) at a Reynolds number of Re = 6300. We also examine the wake patterns, the force coefficients, and the vortex-shedding frequency with emphases on the wall effect and effects of the two-cylinder interference. A critical wall gap of G/D = 0.6 is identified in the single-cylinder case where the wall can exert significant influences. The two near-wall tandem cylinders exhibit three wake states: stretching mode, attachment mode, and impinging mode. The force coefficients on the upstream cylinder are significantly affected by the wall for G/D ≤ 0.6. The downstream cylinder is mainly influenced by the upstream cylinder. For G/D > 0.6, the force coefficients on the two cylinders exhibit a similar variation trend. In the parallel arrangement, the two cylinders exhibit four wake states in different G/D and T/D ranges: double stretching mode, hetero-vortex scale mode, unilateral vortex mode, and free vortex mode. Moreover, the two parallel cylinders in the hetero-vortex scale or free vortex mode have two states: synchronous in-phase state and synchronous out-of-phase state. The mean drag coefficients on the two cylinders decrease, while the mean lift coefficients exhibit opposite variation trends, as the T/D grows.

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Section: Introductionmentioning

confidence: 99%

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Chang,

Yin,

Xin

et al. 2024

JMSE

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Vortex/wake-induced vibrations characteristics of tandem composite risers at moderate Reynolds number

Zhu,

Ren,

Liu

et al. 2024

Ocean Engineering

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Wake interference effects on flow-induced vibration of flexible membrane wings

Li,

Jaiman,

Lei

et al. 2024

Physics of Fluids

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This work investigates the effect of wake interference on the nonlinear coupled dynamics and aerodynamic performance of flexible membrane wings at a moderate Reynolds number. A high-fidelity computational aeroelastic framework is employed to simulate the flow-induced vibration of flexible membrane wings in response to unsteady vortex wake flows produced by an upstream stationary circular cylinder. The coupled dynamics of the downstream membrane are investigated at different gap ratios, aeroelastic numbers, and offset distances. The variations in flow features, membrane responses, and frequency characteristics are analyzed to understand the wake interference effect on membrane aeroelasticity. The results indicate that the aerodynamic performance and flight stability of the downstream membrane are degraded under the wake interference effect. Four distinct flow regimes are classified for the cylinder–membrane configuration, namely (i) single body flow, (ii) co-shedding I, (iii) co-shedding II, and (iv) detached vortex-dominated vibration, respectively. The mode transition is found to build new frequency synchronization between the flexible membrane and its own surrounding flows, or the wake flows of the cylinder, to adjust the aerodynamic performance and membrane vibration. This study sheds new light on membrane aeroelasticity in response to wake flows and enhances understanding of the fluid–membrane coupling mechanism. These findings can facilitate the development of next-generation bio-inspired drones that have high flight efficiency and robust flight stability in gusty flows.

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Investigation on the flow-induced vibration of tandem cylinders with varying diameters at subcritical Reynolds numbers

Cited by 3 publications

References 39 publications

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Wake Structures and Hydrodynamic Characteristics of Flows around Two Near-Wall Cylinders in Tandem and Parallel Arrangements

Vortex/wake-induced vibrations characteristics of tandem composite risers at moderate Reynolds number

Wake interference effects on flow-induced vibration of flexible membrane wings

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