Journal
OCEAN ENGINEERING
Volume 221, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2020.108506
Keywords
Submarine slides; Pipelines; Vertical forces; Pipeline-seabed gaps; CFD approach
Funding
- National Key Research and Development Program of China [2018YFC0309203, 2016YFE0200100]
- National Natural Science Foundation of China [51879036]
- Zhejiang Provincial Natural Science Foundation of China [LQ21E080001]
- ARC Industrial Transformation Research Hub for Offshore Floating Facilities - Australian Research Council
- Woodside Energy
- Shell
- Lloyds Register [IH140100012]
- Universiti Malaysia Sarawak
- Bureau Veritas
- Australian Research Council Centre of Excellence for Geotechnical Science and Engineering
- Fugro Chair in Geotechnics
- Lloyd's Register Foundation Chair
- Centre of Excellence in Offshore Foundations
- Shell EMI Chair in Offshore Engineering
Ask authors/readers for more resources
This paper investigates the vertical forces during submarine slide flow around a pipeline through numerical simulations, discussing the oscillatory characteristics and magnitude of the forces under different gap ratios, and analyzing the effects of gap ratios on the geotechnical and inertial components of the forces.
In recent years, the interaction between submarine slide runout and offshore pipelines has received extensive attention, based on the need to protect pipelines crossing regions susceptible to submarine slides. The interaction force between the slide material and a pipeline may be resolved into horizontal and vertical components, but with most attention to date focusing on the former while the latter has not been studied thoroughly. This paper reports the results from a series of multiphase flow (slide material and the ambient seawater) numerical simulations using a computational fluid dynamics (CFD) approach aimed at investigating the vertical forces during submarine slide flow around a pipeline at different gap ratios (pipeline-seabed gap normalized by pipeline diameter) from 0.08 to 10.0 and at Reynolds numbers ranging from 0.38 to 267. The oscillatory characteristics and magnitude of the vertical forces for different gap ratios are discussed. The effects of the gap ratios on the geotechnical and inertial components of the slide-pipeline vertical forces are analyzed systematically using a hybrid geotechnical-fluid mechanics framework. From the results of the CFD simulations, a modified hybrid geotechnical-fluid mechanics method to estimate the slide-pipeline vertical forces is developed considering the effects of pipeline-seabed gaps.
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