Numerical simulation of 2D granular flow entrainment using DEM

Kang, Chao; Chan, Dave

doi:10.1007/s10035-017-0782-x

Cited by 32 publications

(7 citation statements)

References 42 publications

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“…Fig. 9a through c show that for all particle types, the displacements of particles in surface layers (1,2,5,6) are larger than those of in inner layers (3,4,7,8,9). The displacement of particle 10, located in a high-strength inner layer, is almost 0.…”

Section: The Velocity Vector Diagrammentioning

confidence: 92%

“…DEM was an important tool for modeling the failure behavior of granular geological materials through the time-stepping algorithms that have been developed over the past decade [15,16,17]. Particle flow code (PFC 2D ) makes possible for the modeling of granular flow [8,17,22], fracture of intact rock, transitional block movements, dynamic response to blasting or seismic, and deformation between particles caused by shear or tensile forces, as described by Cundall and Strack [1]. The elements interact with each other via a force displacement law and can be of arbitrary shape, rectangular blocks and spheres being the most common ones.…”

Section: Introductionmentioning

confidence: 99%

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Failure-mode analysis of loose deposit slope in Ya’an-Kangding Expressway under seismic loading using particle flow code

et al. 2018

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PFC 2D (particle flow code in two dimensions) was used to investigate the dynamic processes and hypermobility mechanisms of the loose deposit slope in the Ya-Kang Highway case. The structure of loose deposit slope is simulated by numerous balls, which have different bonding strength. A trial-and-error calibration and biaxial models were applied to determine micro level parameters in PFC 2D. The parallel bonds between particles, the velocity vector diagram, the displacement vector diagram, the porosity and the stress in numerical models were analyzed. It can be concluded that deep sedimentary basins can have large effects on the slope surface. Three different slip patterns, which were identified by the sliding along the slope, the collision of rocks in the down-slope and break through sandstone, respectively, can be found. The velocity 

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Section: The Velocity Vector Diagrammentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Failure-mode analysis of loose deposit slope in Ya’an-Kangding Expressway under seismic loading using particle flow code

et al. 2018

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“…To simulate a cohesive granular material we use the parallel-bond model, originally developed for rock modeling [ 22 ]. This contact model has also proven to be suitable to simulate other cohesive geomaterials, such as sand [ 23 ], debris [ 24 ] and snow [ 20 , 25 – 27 ].…”

Section: Methodsmentioning

confidence: 99%

The concept of the mobilized domain: how it can explain and predict the forces exerted by a cohesive granular avalanche on an obstacle

Kyburz

Sovilla²,

Gaume

et al. 2022

Granular Matter

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The calculation of the impact pressure on obstacles in granular flows is a fundamental issue of practical relevance, e.g. for snow avalanches impacting obstacles. Previous research shows that the load on the obstacle builds up, due to the formation of force chains originating from the obstacle and extending into the granular material. This leads to the formation of a mobilized domain, wherein the flow is influenced by the presence of the obstacle. To identify the link between the physical mobilized domain properties and the pressure exerted on obstacles, we simulate subcritical cohesionless and cohesive avalanches of soft particles past obstacles with circular, rectangular or triangular cross-section using the Discrete Element Method. Our results show that the impact pressure decreases non-linearly with increasing obstacle width, regardless of the obstacle’s cross-section. While the mobilized domain size is proportional to the obstacle width, the pressure decrease with increasing width originates from the jammed material inside the mobilized domain. We provide evidence that the compression inside the mobilized domain governs the pressure build-up for cohesionless subcritical granular flows. In the cohesive case, the stress transmission in the compressed mobilized domain is further enhanced, causing a pressure increase compared with the cohesionless case. Considering a kinetic and a gravitational contribution, we are able to calculate the impact pressure based on the properties of the mobilized domain. The equations used for the pressure calculation in this article may be useful in future predictive pressure calculations based on mobilized domain properties. Graphic Abstract

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“…Third, mass exchange with the bed has not been fully accounted for by discrete models. Specifically, sediment erosion has not been modelled by these models except for a few cases by a single DEM model [39], while the static sediment layer is regarded as sediment deposit during the simulation [29].…”

Section: Discrete Modelsmentioning

confidence: 99%

Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model

Cao

Cui

et al. 2020

Applied Mathematical Modelling

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 A new double layer-averaged two-phase flow model is proposed for barrier lake formation due to landslide impacting a river  Grains play a key role in driving water movement during subaqueous landslide motion and a two-phase theory is warranted  Grain size effects are revealed, i.e., coarse grains and grain-size uniformity favour barrier lake formation  A new threshold for barrier lake formation is proposed, based on landslide-to-river momentum ratio and grain size 2

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Numerical simulation of 2D granular flow entrainment using DEM

Cited by 32 publications

References 42 publications

Failure-mode analysis of loose deposit slope in Ya’an-Kangding Expressway under seismic loading using particle flow code

Failure-mode analysis of loose deposit slope in Ya’an-Kangding Expressway under seismic loading using particle flow code

The concept of the mobilized domain: how it can explain and predict the forces exerted by a cohesive granular avalanche on an obstacle

Barrier lake formation due to landslide impacting a river: A numerical study using a double layer-averaged two-phase flow model

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