Application of CFD for Vortex-Induced Vibration Analysis of Marine Risers in Projects

Dixon, Mark; Charlesworth, D.

doi:10.4043/18348-ms

Cited by 4 publications

(4 citation statements)

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“…The RNG approach, which is a mathematical technique that can be used to derive a turbulence model similar to the k-ε, resulted in a modified form of the epsilon equation which attempts to account for the different scales of motion through changes to the production term. The turbulent model has been analyzed and developed using Re-Normalization Group (RNG) methods to re-normalize the Navier-Stokes (Dixon and Charlesworth, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…Fig. 1: (a) Domain discretisation used to capture the drag coefficient at the cylinder surface and (b) finer density mesh discretisation around the cylinder equations, to account for the effects of smaller scales of motion(Dixon and Charlesworth, 2006).The meshing was split into two regions with the region near the riser having the highest mesh density as shown in Fig.1. These grids are produced by hyperbolic tangent distribution functions and were used to investigate the effects of the grids on the results of turbulent flow.…”

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confidence: 99%

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Simulation of Drill String Vibration inside Well Bore due to Riser's Oscillation

Al-Batati¹,

Hashim²,

Pao³

2014

RJASET

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This study attempts to explain the motion behavior of the marine riser coupled to drill string when the vortex induced vibration is involved. Vibrations have been reported to have a major effect on drilling performance, affecting the Rate of Penetration (ROP), causing severe damage to drilling tools and also reduces the efficiency of the drilling process. There are two major components of drilling tools that are subjected to vibration, namely the marine riser and the drilling string. Analysis of vibration in the marine riser and drill string are two topical areas that have individually received considerable attention by researchers in the past. While these two subjects are interrelated, borne by the fact that the marine riser encapsulates and protects the drill pipe, they have been little attempt to investigate them together as an assembly. Due to the complexities of the models, simplifying assumptions were made in order to undertake the investigation. Using staggered approach, the results were compared with experimental and simulation data from the open literature. It was found that the maximum displacement with negative damping occurs at low frequency and rotation speed. The addition of vortex shedding forces caused the drill string to deform from its vertical axis and thus increased the risk of failure of drill string and riser.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Simulation of Drill String Vibration inside Well Bore due to Riser's Oscillation

Al-Batati¹,

Hashim²,

Pao³

2014

RJASET

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“…The diameter of the riser selected in the simulations is 0.508m. Three different velocities, 0.25m/s, 0.50m/s and 0.75m/s, were chosen in calculation, the Reynolds number of which was 1.3×10 5 , 2.6×10 5 and 3.9×10 5 , respectively. The non-dimensional time step used in the simulation is 0.01, which is sufficiently small for stable time domain simulations.…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

“…However, experimental results can not represent the actual situation due to the harsh sea environment. Some numerical methods have also been used to simulate the flow around a circular cylinder and study the vortex shedding, such as discrete vortex method [4], large eddy simulation method [5] and mesh-free least square-based finite difference method [6]. And controller for VIV has also been studied using CFD simulation by some scholars, such as Korpus [7], Turki [8] and Andrew [9].…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulations of Unsteady Wakes behind Riser in Offshore Deep Water

Zhu

Lin

et al. 2011

AMR

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Riser vortex-induced vibration (VIV) has been the outstanding problem affecting the normal safe operation in offshore oil exploitation. In this paper, based on computational fluid dynamics, a three-dimensional large eddy simulation (LES) numerical model was used to calculate the flow fields of unsteady flow around marine riser with different approaching flow velocities. Then streamlines, velocity and vorticity contours, drag and lift coefficients in different conditions were obtained. Simulation results indicate that the flow properties in different depth display obvious difference, which present complex three dimensional characteristics with interacting. It is thus clear that flow around marine riser can not be regarded as plane potential flow simply. The results also show that with larger approaching flow velocity, lift coefficient amplitude is bigger and frequency is higher, which is easier to result in vibration. Our approach may provide some references for safe design and engineering practice of VIV controlling of marine riser.

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Influence of the Heave Motion of a Floating Drilling Platform on the Crossflow Vortex-Induced Vibration of the Deepwater Drilling Riser

2022

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Summary The study of vortex-induced vibration (VIV) characteristics of deepwater drilling risers is of great significance for correctly evaluating the risers’ fatigue life. Aiming to determine the VIV response of a deepwater drilling riser under the combined action of the heave motion of the floating drilling platform and sea current, this study established a mechanical model and governing equation of crossflow vortex-parametric vibration (CFVPV) based on the Van der Pol wake oscillator and Euler-Bernoulli beam. For this model, the governing equation is discretized in the time domain by applying the finite element method (FEM), and the equivalent integral form of the differential governing equation is obtained by the Galerkin method, and then solved using the Newmark method. On this basis, the influence of both the heave motion of the floating drilling platform, including the top tension fore, amplitude, and frequency, and the current profile on the CFVPV are analyzed in detail. The results show that the mechanical model and analysis method can be used to assess the CFVPV of deepwater drilling risers with high calculation accuracy. When considering the heave motion, the amplitude of the CFVPV response increases significantly, and more components of the vibration frequency appear. Moreover, the CFVPV displacement decreases with the top tension coefficient and heave motion frequency, while increasing with heave motion amplitude. It was found that the heave motion frequency changes the vibration amplitude and mode of the CFVPV, the effect of which was more obvious for the middle and lower parts of the riser. In addition, increasing the flow velocity reduces the effect of the heave motion. Finally, the CFVPV response at both ends of the riser was greater than that at the middle of the riser under the same flow velocity.

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Application of CFD for Vortex-Induced Vibration Analysis of Marine Risers in Projects

Cited by 4 publications

References 0 publications

Simulation of Drill String Vibration inside Well Bore due to Riser's Oscillation

Simulation of Drill String Vibration inside Well Bore due to Riser's Oscillation

Large Eddy Simulations of Unsteady Wakes behind Riser in Offshore Deep Water

Influence of the Heave Motion of a Floating Drilling Platform on the Crossflow Vortex-Induced Vibration of the Deepwater Drilling Riser

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