Interaction between submarine landslides and suspended pipelines with a streamlined contour

Fan, Ning; Nian, Tingkai; Jiao, Hou-bin; Jia, Yonggang

doi:10.1080/1064119x.2017.1362084

Cited by 39 publications

(17 citation statements)

References 26 publications

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“…As for high Re non-Newtonian , the numerical results are lower than the experimental data. This may be due to the large discreteness of experimental results [30].…”

Section: Comparison and Validationmentioning

confidence: 99%

“…For low Re non-Newtonian conditions, the static pressure force closely related to the flow height (H) is dominant. Therefore, the drag force increases with H. For high Re non-Newtonian conditions, the static pressure force is negligible, hence the differential pressure inertia force, which is due to the separated region of the monopile, is considered [30]. Figure 10 compares the mud volume fraction and pressure distribution of the same submarine debris flow with the same high impacting velocity at the time of the peak drag force.…”

Section: Influence Of the Submarine Debris Flow Heightsmentioning

confidence: 99%

“…Next, some researchers extended the previous works to study the normal and longitudinal interaction forces at different impact angles of submarine debris flows [23][24][25]. Afterwards, more factors on the drag force, such as suspension height [26][27][28], temperature of submarine debris flows [29], shape of the pipeline [30][31][32], strain-softening effects on soil strength [33], were also considered. In addition, some studies [34,35] used the material point method to investigate impact forces on pipelines, while an explanation of the mechanism of peak force was provided by [36,37].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Chen

Liao

2021

JMSE

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Offshore installations with pile foundations in shallow water are vulnerable to submarine landslides, which cause serious damage to engineering facilities, loss of life, and loss of money. Due to a shortage of real observation data and the difficulty of reproduction, we lack insight into the interaction behavior between submarine landslides and monopiles. This study capitalized on ANSYS Fluent 20.0 to develop a three-dimensional biphasic (water and slurry) numerical model. This CFD model was used to analyze the interaction between a monopile and submarine landslides at different flow heights. The velocities of submarine landslides were from low to high values. Two modes of interactional forces acting on the monopile are proposed, which are (i) interaction force with peak value and (ii) interaction force without peak value. The influence of flow height and velocity on interaction forces was investigated. Results show that the effect of the flow heights on the interaction force is significant at low velocity stage, while the peak force representing a hazard level of the pile was non-negligible under high flow velocity and low flow height conditions, which should be considered in a future study. The related mechanisms are revealed with a hybrid model considering different components of the force.

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“…As for high Re non-Newtonian , the numerical results are lower than the experimental data. This may be due to the large discreteness of experimental results [30].…”

Section: Comparison and Validationmentioning

confidence: 99%

Section: Influence Of the Submarine Debris Flow Heightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Chen

Liao

2021

JMSE

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“…Compared with rigid pipelines, the flexible pipeline will become the main form of submarine pipeline development due to its obvious advantages such as high-speed laying, seawater corrosion resistance, bending, and tension resistance. The efficiency of submarine pipeline laying will become a hot issue in marine energy transportation [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

et al. 2021

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In order to adapt to the complex and changeable marine environment such as wind, wave, and current, the physical simulation experiment is usually needed in the design of a deep-sea flexible pipeline-laying system. In reality, the flexible pipeline-laying system is very large, and the experimental cost is huge. Therefore, when analyzing this system, it is necessary to carry out scaled model experiments to verify the rationality of it. Taking the flexible pipeline-laying system working under four-level sea conditions as an example, this paper deduces the similarity criteria of the scaled model according to the similarity theory. According to the required experimental site, the sizes and materials of the model are selected, and then the physical quantities of the model and their similarity ratio corresponding to the prototype are determined. According to the physical quantities of the experimental model, the similarity of dynamic characteristics and structural strength between the model and the prototype are verified by Adams and ANSYS Workbench. The research shows that the scaled model and prototype based on similarity theory can meet the established similarity relationship, and the scaled model experiment is an effective way to verify the rationality of the design of a flexible pipeline-laying system.

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“…Both natural and human activities, such as earthquake, gas hydrates dissociation [3,4], and hydrocarbon production [5], are able to trigger submarine landslides. As opposed to terrestrial landslides, submarine landslides normally affect a wider range of areas [6,7], not only posing a great risk to submarine pipelines and other seafloor structures [8,9] but also causing severe casualties due to tsunamis. Compared with forecasting the occurrence probability of a marine landslide, estimating the postfailure behaviors and characteristics of a marine landslide is of equal importance [10,11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of a Submarine Landslide Using the Coupled Material Point Method

Jiajie

Zhang

Wang

et al. 2020

Mathematical Problems in Engineering

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Exploring the submarine landslide is challenging due to the invisibility nature and the complex soil-water interaction and large deformation throughout its runout process. The purpose of this paper is to investigate the ability of the coupled material point method (MPM) in modeling the soil flows under water. A sand-column collapse experiment is performed fully under water initially, with the results used to benchmark the MPM analysis. Thereafter, the whole failure process of a real submarine landslide in the South Mediterranean sea is simulated using MPM. The results show that MPM can be a reliable tool in capturing the postfailure behaviors of the submarine landslide. The failure mode of the landslide is flow-type, with an initial translational slide moving to a diffusive one eventually.

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Interaction between submarine landslides and suspended pipelines with a streamlined contour

Cited by 39 publications

References 26 publications

Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Scaled Model Simulation and Experimental Verification of Submarine Flexible Pipeline Laying System

Simulation of a Submarine Landslide Using the Coupled Material Point Method

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