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

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Abstract

We present a three-dimensional Large Eddy Simulations (LES) study on the hydrodynamics of a circular cylinder dose 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 spanwise-uniform cylinders over the parameter space considered in this study.

Original languageEnglish
Pages (from-to)424-433
Number of pages10
JournalOcean Engineering
Volume146
DOIs
Publication statusPublished - 1 Dec 2017

Cite this

@article{06bd33354f844ca7a8abf728152ebb17,
title = "The hydrodynamic forces on a circular cylinder in proximity to a wall with intermittent contact in steady current",
abstract = "We present a three-dimensional Large Eddy Simulations (LES) study on the hydrodynamics of a circular cylinder dose 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 spanwise-uniform cylinders over the parameter space considered in this study.",
keywords = "Hydrodynamic force, Submarine pipeline, Zebraic spanning, Steady flow, PLANE WALL, SUBMARINE PIPELINE, BOUNDARY-LAYER, FLOW, VORTEX, INSTABILITY, SPANS",
author = "Feifei Tong and Liang Cheng and Hongwei An and Terry Griffiths",
year = "2017",
month = "12",
day = "1",
doi = "10.1016/j.oceaneng.2017.09.061",
language = "English",
volume = "146",
pages = "424--433",
journal = "Ocean Engineering",
issn = "0029-8018",
publisher = "Pergamon",

}

TY - JOUR

T1 - The hydrodynamic forces on a circular cylinder in proximity to a wall with intermittent contact in steady current

AU - Tong, Feifei

AU - Cheng, Liang

AU - An, Hongwei

AU - Griffiths, Terry

PY - 2017/12/1

Y1 - 2017/12/1

N2 - We present a three-dimensional Large Eddy Simulations (LES) study on the hydrodynamics of a circular cylinder dose 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 spanwise-uniform cylinders over the parameter space considered in this study.

AB - We present a three-dimensional Large Eddy Simulations (LES) study on the hydrodynamics of a circular cylinder dose 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 spanwise-uniform cylinders over the parameter space considered in this study.

KW - Hydrodynamic force

KW - Submarine pipeline

KW - Zebraic spanning

KW - Steady flow

KW - PLANE WALL

KW - SUBMARINE PIPELINE

KW - BOUNDARY-LAYER

KW - FLOW

KW - VORTEX

KW - INSTABILITY

KW - SPANS

U2 - 10.1016/j.oceaneng.2017.09.061

DO - 10.1016/j.oceaneng.2017.09.061

M3 - Article

VL - 146

SP - 424

EP - 433

JO - Ocean Engineering

JF - Ocean Engineering

SN - 0029-8018

ER -