Two-phase MPM modelling of debris flow impact against dual rigid barriers

Ng, Charles Wang Wai; Jia, Zhenyang; Poudyal, Sunil; Bhatta, Aastha; Liu, Haiming

doi:10.1680/jgeot.22.00199

Cited by 10 publications

(2 citation statements)

References 45 publications

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“…In this regard, numerical methods coupling computational fluid dynamics, lattice Boltzmann method (LBM), or smoothed particle hydrodynamics with the discrete element method (DEM) have been increasingly used to provide fundamental insights into pore clogging (Sun et al, 2019;K. Zhou et al, 2018), landslides (Jing et al, 2018;Yang et al, 2019), internal soil erosion (Xiong et al, 2020), and debris flows (K. F. E. Cui et al, 2021;Ng et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, particle‐resolved computational methods for fluid‐structure coupling enable us to visualize the three‐dimensional interactions between particles and flow fields (Jing et al., 2016; Yang et al., 2021). In this regard, numerical methods coupling computational fluid dynamics, lattice Boltzmann method (LBM), or smoothed particle hydrodynamics with the discrete element method (DEM) have been increasingly used to provide fundamental insights into pore clogging (Sun et al., 2019; K. Zhou et al., 2018), landslides (Jing et al., 2018; Yang et al., 2019), internal soil erosion (Xiong et al., 2020), and debris flows (K. F. E. Cui et al., 2021; Ng et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

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Clogging and Unclogging of Fine Particles in Porous Media: Micromechanical Insights From an Analog Pore System

Yin,

Cui,

Jing

2024

Water Resources Research

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Pore clogging and unclogging in porous media are ubiquitous in subsurface hydrologic processes, which have been studied extensively at various scales ranging from a single pore to porous‐medium samples. However, it remains unclear how fluid flow, particle rearrangement, and the arching effect typical of cone‐shaped pore geometry interact and how they are captured by a pressure drop model at the macroscopic scale. Here, we investigate the pore‐scale feedback mechanisms between fluid flow and pore clogging and unclogging using a fully resolved fluid‐particle coupling approach (lattice Boltzmann method‐discrete element method). We first propose to use a truncated‐cone pore to represent realistic pore geometries revealed by X‐ray images of prepared sand packing. Then, our simulations indicate that the pore cone angle significantly influences the pressure drop associated with the clogging process by enhancing particle contacts due to arching. A modified Ergun equation is developed to consider this geometric effect. At the microscale, clogging can be explained by the interparticle force statistics; a few particles in an arch (or a dome) take the majority of hydrodynamic pressure. The maximum interparticle force is positively proportional to the particle Reynolds number and negatively associated with the tangent of the pore cone angle. Finally, a formula is established utilizing fluid characteristics and pore cone angle to compute the maximal interparticle force. Our findings, especially a modified pressure drop model that accounts for pore geometry resistance, provide guidance for applying pore‐scale models of clogging and unclogging to large‐scale subsurface fines transportation issues, including seepage‐induced landslides, stream bank failure, and groundwater recharge.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clogging and Unclogging of Fine Particles in Porous Media: Micromechanical Insights From an Analog Pore System

Yin,

Cui,

Jing

2024

Water Resources Research

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Granular material regime transitions during high energy impacts of dry flowing masses: MPM simulations with a multi‐regime constitutive model

Marveggio,

Zerbi,

Redaelli

et al. 2024

Num Anal Meth Geomechanics

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The dynamic interaction between granular flowing masses and rigid obstacles is a complex phenomenon characterised by both large displacements and high strain rates. In case the flowing mass is modelled as a continuum, its numerical simulation requires both advanced computational tools and constitutive relationships capable of predicting the mechanical behaviour of the same material under both fluid and solid regimes. In this paper, the authors employed the open‐source ANURA3D code, based on the Material Point Method (MPM), and a multi‐regime constitutive model. A series of impacts characterised by different velocities, initial void ratios, front inclinations and impacting mass lengths have been simulated. The MPM numerical results are critically compared with those obtained by using a Discrete Element Method (DEM) numerical code. The model capability of simulating material regime transitions, from fluid to solid and vice versa, is shown to be crucial for reproducing the mechanical response of the flowing mass put in evidence by DEM data.

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Investigation of Debris Flow Impact Mechanisms and Designs

Ng,

Poudyal,

Liu

et al. 2023

Progress in Landslide Research and Technology

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Debris flows are catastrophic landslides increasing in severity in recent decades due to the more frequent and intense rainfall events under climate change. Debris flows pose a serious threat to infrastructure, settlements, and the natural environment in mountainous regions around the world causing considerable economic losses every year. To mitigate debris flows, single and multiple rigid and flexible barriers are constructed along the predicted debris flow paths. Compared with single barriers, multiple barriers are more advantageous in mitigating large debris flow volumes by progressively retaining and decelerating the flow with much smaller barrier sizes. These smaller barriers are not only easier to construct on steep hillslopes but also reduce the carbon footprint compared to large single barriers. However, current understanding of debris flow impact mechanisms on single and multiple barriers is limited due to the complex composition and scale-dependent nature of debris flow. The need of using different barrier configurations further adds to this complexity and the impact mechanisms of debris flow against single and multiple barriers are yet to be elucidated, thereby hindering the development of scientific design guidelines. This paper examines the impact mechanisms of water, dry granular and two-phase debris flows on barriers of varying stiffness, openings and numbers based on physical and numerical results, and provides recommendations for design of debris-resisting single and multiple barriers.

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Two-phase MPM modelling of debris flow impact against dual rigid barriers

Cited by 10 publications

References 45 publications

Clogging and Unclogging of Fine Particles in Porous Media: Micromechanical Insights From an Analog Pore System

Clogging and Unclogging of Fine Particles in Porous Media: Micromechanical Insights From an Analog Pore System

Granular material regime transitions during high energy impacts of dry flowing masses: MPM simulations with a multi‐regime constitutive model

Investigation of Debris Flow Impact Mechanisms and Designs

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