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

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

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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.

local scournumerical simulationsubmarine pipelinesYellow River Delta

Peng Yu、Ruigeng Hu、Jike Zhang、Qi Yang、Jieru Zhao、Lei Cao、Chenghao Zhu

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Key Laboratory of Geological Safety of Coastal Urban Underground Space,Ministry of Natural Resources,Qingdao,China

Qingdao Geo-Engineering Surveying Institute(Qingdao Geological Exploration Development Bureau),Qingdao,China

Sinopec Petroleum Engineering Corporation,Dongying,China

State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing,China

Department Civil and Environmental Engineering,Politecnico di Milano,Milan,Italy

College of Environmental Science and Engineering,Ocean University of China,Qingdao,China

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中国博士后科学基金国家自然科学基金

2023M73199952301326

2024

10.1002/dug2.12068

深地科学(英文)

深地科学(英文)

ISSN：
年,卷(期)：2024.3(2)
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