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

Huang, Jong Shin; Yin, Guang; Ong, Muk Chen; Myrhaug, Dag; Jia, Xu

doi:10.3390/jmse9101102

Cited by 9 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The two-phase model for simulating sheet flows in the open-source CFD software OpenFOAM is referred to as SedFOAM [96][97][98]. SedFOM has achieved accurate prediction of scour around subsea pipelines [99][100][101]. However, the two-phase models have not been used in cases with complex geometries as much as the one-phase sediment transport rate models, mainly due to their slower computational speed.…”

Section: Two-phase Modelmentioning

confidence: 99%

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

Zhao

2022

JMSE

View full text Add to dashboard Cite

This paper reviews the recent development of numerical modelling of local scour around hydraulic and marine structures. The numerical models for simulating local scour are classified into five categories: sediment transport rate models, two-phase models, CFD-DEM models, equilibrium scour models and depth-averaged models. The sediment transport rate models are the most popularly used models because of their high calculation speed and availability of empirical formulae for predicting sediment transport rates. Two-phase models were developed to simulate sediment transport in the format of sheet flow under strong current velocity or strong turbulence. The CFD-DEM model simulates the motion of every individual sediment particle. Its speed is the slowest, but it provides the opportunity to understand fundamental mechanisms of flow–particle interaction and particle–particle interaction using small-scale simulations. Equilibrium scour models predict the final scour profile at the equilibrium stage but cannot predict scour history. The depth-averaged models that were developed early are not recommended for local scour problems because they are not able to predict three-dimensional features around structures. Although many numerical models have been developed and many studies have been conducted to investigate local scour, some challenging problems remain to be solved, for example, the effects from scaling and sediment gradation. In addition, people’s understanding of local scour of cohesive sand is still very shallow, and more experimental and numerical research in this area is needed.

show abstract

Section: Two-phase Modelmentioning

confidence: 99%

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

Zhao

2022

JMSE

View full text Add to dashboard Cite

show abstract

“…(3) Submarine Pipelines, Underwater Tunnel Linings, and Subsea Shuttle Tanker Two-dimensional numerical simulations were performed in [9] 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 an open-source SedFoam. The turbulence flow was resolved using the two-phase modified k-ω 2006 model, and the particle stresses due to the binary collisions and enduring contacts among the sediments were modeled using the rheology model of granular flow.…”

Section: (1) Pile or Monopile Foundationsmentioning

confidence: 99%

Instability and Failure of Subsea Structures

Gao

Yin

2022

JMSE

View full text Add to dashboard Cite

show abstract

“…The numerical results showed that the maximum vibration amplitude of the pipeline could reach about 1.2 times diameter, and the maximum scour depth occurred on the wake side of the vibrating pipeline. In 2021, Huang [16] carried out two-dimensional numerical simulations to investigate the scour beneath a single pipeline and piggyback pipelines subjected to an oscillatory flow condition at a KC number of 11 and captured typical steady-streaming structures around the pipelines due to the oscillatory flow condition. In 2021, Cui [17] investigated the characteristics of the riverbed scour profile for a pipeline buried at different depths under the condition of riverbed sediments with different particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Local Scouring Process and Influencing Factors of Semi-Exposed Submarine Cables

Li,

Hao,

Zhang

et al. 2023

JMSE

View full text Add to dashboard Cite

Local scouring might result in the spanning of submarine cables, endangering their mechanical and electrical properties. In this contribution, a three-dimensional computational fluid dynamics simulation model is developed using FLOW-3D, and the scouring process of semi-exposed submarine cables is investigated. The effects of the sediment critical Shields number, sediment density, and ocean current velocity on local scouring are discussed, and variation rules for the submarine cables’ spanning time are provided. The results indicate that three scouring holes are formed around the submarine cables. The location of the bottom of the holes corresponds to that of the maximum shear velocity. The continuous development of scouring holes at the wake position leads to the spanning of the submarine cables. The increase in the sediment’s critical Shields number and sediment density, as well as the decrease in the ocean current velocity, will extend the time for maintaining the stability of the upstream scouring hole and retard the development velocity of the wake position and downstream scouring holes. The spanning time has a cubic relationship with the sediment’s critical Shields number, a linear relationship with the sediment density, and an exponential relationship with the ocean current velocity. In this paper, the local scouring process of semi-exposed submarine cables is studied, which provides a theoretical basis for the operation and maintenance of submarine cables.

show abstract

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

Cited by 9 publications

References 28 publications

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

Instability and Failure of Subsea Structures

Numerical Study of the Local Scouring Process and Influencing Factors of Semi-Exposed Submarine Cables

Contact Info

Product

Resources

About