Fluid Loads on Pipelines: Sheltered or Sliding

Jacobsen, V.; Bryndum, M.B.; Bonde, C.

doi:10.4043/6056-ms

Cited by 16 publications

(6 citation statements)

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“…Different embedment depths besides the cylinder were considered for the first time. In agreement with Jacobsen et al (1989), the in-line force reduces due to the reduction in exposed area normal to the flow. Interestingly, although seepage flow was found to be a few magnitudes smaller than the undisturbed inlet flow, it played a role in enlarging the in-line force.…”

Section: Introductionsupporting

confidence: 71%

“…Unless otherwise specified, both the seabed wall and the wedge shoulder have been treated as impermeable, which means the cylinder contacted area has been cut off in calculating the forces. As noted by Jacobsen et al (1989) and An et al (2011), this approach would lead to smaller in-line forces. As compared to a rounded shape, the adopted sharp-edged shoulder is known to complicate the flow patterns around structures (Tian et al 2014) and increase the flow kinetic energy.…”

Section: Results Discussionmentioning

confidence: 97%

“…Due to its natural process, the hydrodynamic loading is usually studied concurrently with the bed-form evolution and the pipe-soil interaction (Xu et al 2010;Gao, Gu & Jeng 2003). For a cylinder buried in an impermeable bed, the reduction in the force coefficient were found to be substantial, especially for the in-line force (Jacobsen et al 1989). Probably as expected, the force coefficients decreased with increasing burial ratio for the steady current (Cokgor & Avci 2001).…”

Section: Introductionmentioning

confidence: 82%

“…For a partially buried cylinder, both hydrodynamic forces and the flow features have been reasonably researched (Jacobsen, Bryndum & Bonde 1989;Cokgor & Avci 2001;Gao et al 2011;Akoz 2012). Due to its natural process, the hydrodynamic loading is usually studied concurrently with the bed-form evolution and the pipe-soil interaction (Xu et al 2010;Gao, Gu & Jeng 2003).…”

Section: Introductionmentioning

confidence: 99%

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The hydrodynamic forces on a circular cylinder in proximity to a wall with intermittent contact in steady current

Tong

Cheng

et al. 2017

Ocean Engineering

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We present a three-dimensional Large Eddy Simulations (LES) study on the hydrodynamics of a circular cylinder close to a wall. Intermittent gaps between the cylinder and wall, forming spanning and non-spanning sections along the span are considered. This geometry setting represents an idealized model of pipelines laid on an uneven seabed. As compared to that of the corresponding spanwise-uniform cylinders, the drag coefficient on spanning sections is generally smaller, while the drag on non-spanning sections is slightly larger. Large amplitudes of the sectional forces are observed, partially due to the variations of the gap flow under the spanned sections. Flow deflection from the non-spanning section to the spanning section induces changes in local force and pressure distributions. Despite these changes, the mean force on the cylinder with intermittent contact as a whole is shown to be reasonably estimated by pro rata of forces from spanwiseuniform cylinders over the parameter space considered in this study. Keywords:hydrodynamic force submarine pipeline zebraic spanning steady flow

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Section: Introductionsupporting

confidence: 71%

Section: Results Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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The hydrodynamic forces on a circular cylinder in proximity to a wall with intermittent contact in steady current

Tong

Cheng

et al. 2017

Ocean Engineering

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“…En hydrodynamique, la composante horizontale des efforts qui s'applique au pipeline (FH ) est généralement considérée comme la somme de deux forces : l'une d'inertie, l'autre de sillage (Lambrakos et al, 1987 ;Fyfe et al, 1987 ;Jacobsen et al. 1989...).…”

Section: Simulation Des Actions Hydrodynamiquesunclassified

Étude expérimentale de l’interaction entre les fonds marins et les pipelines flexibles soumis à la houle et aux courants

2001

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Experimental study of interaction between soil and flexible pipeline exposed to wave and current actions Abstract Uncovered submarine pipelines resting on seabed are subject to hydrodynamic forces generated by wave and current actions. These forces, which tend to destabilize or move the pipe, are counterbalanced by the interaction of the pipe with the soil. To ensure the stability of these pipelines, their design requires a realistic estimation of these two external forces. In this context, a comprehensive research program has been carried out by Coflexip society and laboratoire Sols, Solides, Structures of Grenoble to investigate pipe-soil interaction. This paper presents the results of a series of full scale pipe-soil interaction tests which constitute the first part of this research program. These tests have been carried out with a testing apparatus in which hydrodynamic forces under real pipeline sections are applied by means of mechanical jacks. In these experiments, the pipeline was resting either on a clayey or a sandy soil. The testing parameters were the nature and density of the soil, the pipe diameter, the pipeline loading and the history of loading. An assessment of their relative Influence on both pipeline self burial and soil lateral resistance is presented. Based on the results of the experimental study, an analytical model is proposed for evaluating soil lateral resistance.

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