Evaluation of instantaneous impact forces on fixed pipelines from submarine slumps

Guo, Xingsen; Liu, Xiaolei; Zhang, Hong; Li, Minqiang; Luo, Qianyu

doi:10.1007/s10346-022-01950-3

Cited by 13 publications

(1 citation statement)

References 63 publications

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“…However, multi-particle systems are more common and more important in the real world, one of which is submarine landslides (Guo et al, 2023b;Zhang et al, 2023). Submarine landslides can generate enormous turbidity currents with large amounts of sediment (Nisbet and Piper, 1998;Guo et al, 2022). These two marine geological disasters are essentially two types of immersed granular flow characterized by different particle volume concentrations.…”

Section: Immersed Granular Collapsementioning

confidence: 99%

CFD-DEM modeling of turbidity current propagation in channels with two different topographic configurations

Liu

Sun

et al. 2023

Front. Mar. Sci.

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Submarine turbidity currents are a special type of sediment gravity flow responsible for turbidite deposits, attracting great interests from scientists and engineers in marine and petroleum geology. This paper presents a fully coupled computational fluid dynamics (CFD) and discrete element method (DEM) model to quantitatively analyze the turbidity current propagation in channels with two different topographic configurations. An appropriate drag force model is first incorporated in the CFD-DEM scheme, and two benchmark cases, including a single-particle sedimentation case and an immersed granular collapse case, are conducted to verify the accuracy of the developed CFD-DEM model. The model is then employed to investigate the fluid and particle dynamics of turbidity currents flowing over a flat bed (FB), and three obstacle-placed beds with different heights (OPB, OPB_1 and OPB_2). The CFD-DEM results indicate that the front position of turbidity current in the FB case is well consistent with the classic lock-exchange experiment. Results also show that the presence of the obstacle can clearly diminish the inter-particle collisions and the particle kinetic energy, weaken the particle-fluid interactions, and further make more sediment particles settle in front of the obstacle. Increase of obstacle height can result in diverse flow morphology of particles and fluids, and intensify the influences of obstacle on particle dynamics of turbidity currents. We show that our models enable reproducing the typical process of turbidity current propagation, and further can provide more valuable insights in understanding the turbidite-related geological phenomena from the point of view of particulate flow.

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