Local scour around a pipeline sleeper system under different flow directions

Mamoon, Abdullah-Al; Zhao, Ming; Wu, Helen; Keshavarzi, Alireza; Hu, Pan; An, Hongwei

doi:10.1016/j.coastaleng.2023.104335

Cited by 5 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio of the prototype to the model is 1:40. In scour tests, it is usually impossible to ensure that all parameters between the prototype and the model meet the Froude similarity criterion, which, to some extent, leads to the scale effect in model tests (Mamoon et al, 2023). For example, to avoid the viscous force between sediment particles, the sediment particles are not reduced according to the geometric scale, which would underestimate the suspended load transport amount.…”

Section: Model Parameter Valuementioning

confidence: 99%

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Yu,

Hu,

Zhang

et al. 2024

Deep Underground Science and Engineering

View full text Add to dashboard Cite

Due to their high reliability and cost‐efficiency, submarine pipelines are widely used in offshore oil and gas resource engineering. Due to the interaction of waves, currents, seabed, and pipeline structures, the soil around submarine pipelines is prone to local scour, severely affecting their operational safety. With the Yellow River Delta as the research area and based on the renormalized group (RNG) k‐ε turbulence model and Stokes fifth‐order wave theory, this study solves the Navier–Stokes (N–S) equation using the finite difference method. The volume of fluid (VOF) method is used to describe the fluid‐free surface, and a three‐dimensional numerical model of currents and waves–submarine pipeline–silty sandy seabed is established. The rationality of the numerical model is verified using a self‐built waveflow flume. On this basis, in this study, the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed in the prototype environment are explored and the influence of the presence of pipelines on hydrodynamic features such as surrounding flow field, shear stress, and turbulence intensity is analyzed. The results indicate that (1) local scour around submarine pipelines can be divided into three stages: rapid scour, slow scour, and stable scour. The maximum scour depth occurs directly below the pipeline, and the shape of the scour pits is asymmetric. (2) As the water depth decreases and the pipeline suspension height increases, the scour becomes more intense. (3) When currents go through a pipeline, a clear stagnation point is formed in front of the pipeline, and the flow velocity is positively correlated with the depth of scour. This study can provide a valuable reference for the protection of submarine pipelines in this area.

show abstract

Section: Model Parameter Valuementioning

confidence: 99%