Numerical simulations of flow-induced vibrations of two rigidly coupled cylinders with uneven diameters in the upper transition Reynolds number regime

Serta, Clarissa Pires Vieira; Janocha, Marek Jan; Yin, Guang; Ong, Muk Chen

doi:10.1016/j.jfluidstructs.2021.103332

Cited by 10 publications

(12 citation statements)

References 22 publications

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“…For decades, a configuration called piggyback pipeline has been widely used, which consists of one primary large pipeline used to transport oil or gas and a small pipeline rigidly installed with the large one to transport chemicals. It was reported in Yang et al [21] and Serta et al [22] that hydrodynamic interference can be triggered by the additional small pipeline. Furthermore, the studies carried out by Zhao and Cheng [23], Zhao et al [14], Zhao et al [24] and Yang et al [25] reported changes in the scour beneath a piggyback pipeline compared with that beneath a single pipeline under currents.…”

Section: Introductionmentioning

confidence: 94%

Numerical Investigation of Scour Beneath Pipelines Subjected to an Oscillatory Flow Condition

Huang¹,

Yin

Ong

et al. 2021

JMSE

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The present study carries out two-dimensional numerical simulations to investigate scour beneath a single pipeline and piggyback pipelines subjected to an oscillatory flow condition at a Keulegan–Carpenter (KC) number of 11 using SedFoam (an open-source, multi-dimensional Eulerian two-phase solver for sediment transport based on OpenFOAM). The turbulence flow is resolved using the two-phase modified k−ω 2006 model. The particle stresses due to the binary collisions and enduring contacts among the sediments are modeled using the rheology model of granular flow. The present numerical model is validated for the scour beneath a single pipeline, and the simulated sediment profiles are compared with published experimental data and numerical simulation results. The scour process beneath three different piggyback pipelines under the same flow condition are also considered, and the scour development and surrounding flow patterns are discussed in detail. Typical steady-streaming structures around the pipeline due to the oscillatory flow condition are captured. The scour depth during the initial development of the scour process for the piggyback pipeline with the small pipeline placed above the large one is the largest among all the investigated configurations. The phase-averaged flow fields show that the flow patterns are influenced by the additional small pipeline.

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Section: Introductionmentioning

confidence: 94%

Numerical Investigation of Scour Beneath Pipelines Subjected to an Oscillatory Flow Condition

Huang¹,

Yin

Ong

et al. 2021

JMSE

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“…The piggyback cylinders configurations are widely used in engineering. Their hydrodynamic characteristics have been extensively investigated in Yang et al [21], Janocha & Ong [2] and Serta et al [3]. The computational domain and the boundary conditions for the numerical simulations are set the same as those used in Serta et al [3] and Janocha et al [22].…”

Section: The Computational Overviewmentioning

confidence: 99%

“…Their hydrodynamic characteristics have been extensively investigated in Yang et al [21], Janocha & Ong [2] and Serta et al [3]. The computational domain and the boundary conditions for the numerical simulations are set the same as those used in Serta et al [3] and Janocha et al [22]. Detailed mesh and time-step convergence studies to determine the optimal grid and time-step resolutions as well as the validation studies for the present numerical model have already been conducted in Janocha et al [22] and Serta et al [3] and are not presented in the present study.…”

Section: The Computational Overviewmentioning

confidence: 99%

“…The computational domain and the boundary conditions for the numerical simulations are set the same as those used in Serta et al [3] and Janocha et al [22]. Detailed mesh and time-step convergence studies to determine the optimal grid and time-step resolutions as well as the validation studies for the present numerical model have already been conducted in Janocha et al [22] and Serta et al [3] and are not presented in the present study. A body fitted hexahedral grid is used near the cylinders for the simulation and a H-grid topology is used in the far field.…”

Section: The Computational Overviewmentioning

confidence: 99%

“…The wake flows behind a cylinder undergoing VIV display complicated coherent flow structures which lead to unsteady hydrodynamic forces on the cylinders. Most of the current studies usually investigated the hydrodynamic forces and performed spectrum decomposition of their time histories to obtain their characteristic frequencies such as Zhao et al [1], Janocha & Ong [2] and Serta et al [3]. Qualitive analysis of the wake coherent flow structures was performed by using vortical structures identification.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of Hydrodynamic Forces on Cylinders Undergoing Flow-Induced Vibrations Based on Modal Analysis

Yin

Janocha

Ong

2022

Journal of Offshore Mechanics and Arctic Engineering

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The objective of the present study is estimating hydrodynamic forces acting on cylinders undergoing vortex-induced-vibration (VIV) using Dynamic Mode Decomposition (DMD). The cylinders are subjected to a uniform incoming flow at a laminar Reynolds number (Re=250) and an upper transition Reynolds number (Re = 3.6 × 106) (Re = U∞D/v defined based on the incoming flow U∞, the diameter of the cylinder D and the viscosity of the fluid v). Both a single cylinder and a configuration of piggyback cylinders are considered. Numerical simulations based on two-dimensional URANS (Unsteady Reynolds Averaged Navier-Stokes) equations combined with the k-ω SST turbulence model are carried out to obtain the snapshots of the surrounding flow fields for DMD analysis. The DMD method is a powerful tool to obtain the spatial-temporal evolution characteristics of the coherent structures in the wake flow behind the cylinders. In the present study, this modal decomposition method is combined with a moving reference frame around the cylinders. The dominant DMD modes with their corresponding frequencies of the wake flows are identified and are used to reconstruct the flow fields. The large-scale shedding vortices are captured by the dominant modes. The reconstructed wake flow behind the cylinders is used to estimate the drag and lift forces on the cylinders combined with a force partitioning analysis.

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Numerical study on flow-induced vibration of an oscillating cylinder with an unattached downstream square plate at a low Reynolds number

Gong,

Dally

2023

Ocean Engineering

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Numerical simulations of flow-induced vibrations of two rigidly coupled cylinders with uneven diameters in the upper transition Reynolds number regime

Cited by 10 publications

References 22 publications

Numerical Investigation of Scour Beneath Pipelines Subjected to an Oscillatory Flow Condition

Numerical Investigation of Scour Beneath Pipelines Subjected to an Oscillatory Flow Condition

Estimation of Hydrodynamic Forces on Cylinders Undergoing Flow-Induced Vibrations Based on Modal Analysis

Numerical study on flow-induced vibration of an oscillating cylinder with an unattached downstream square plate at a low Reynolds number

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