A semi-resolved CFD-DEM model for seepage-induced fine particle migration in gap-graded soils

Cheng, Kuang; Wang, Yin; Yang, Qing

doi:10.1016/j.compgeo.2018.04.004

Cited by 136 publications

(42 citation statements)

References 60 publications

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“…The internal erosion rate is proportional to the flow velocity for both spherical and non-spherical particles, and a critical velocity exists for angular particles owing to grain interlocking which is not observed for the spherical particles (Guo et al, 2018). As shown in Figure 14, the seepage field is distributed uniformly in the fine-grained dam material which results in a global seepage failure (flowing soil), whereas it is gradually deflected with the increase in the hydraulic gradient and local seepage failure (piping) occurs in the coarse-grained dam material (Cheng et al, 2018;Shi et al, 2018).…”

Section: Discontinuous Medium Methodsmentioning

confidence: 95%

Recent Advances in Stability and Failure Mechanisms of Landslide Dams

et al. 2021

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Numerous landslide dams have been induced in recent years as a result of frequent earthquakes and extreme climate hazards. Landslide dams present serious threats to lives and properties downstream due to potentially breaching floods from the impounded lakes. To investigate the factors influencing the stability of landslide dams, a large database has been established based on an in-depth investigation of 1,737 landslide dam cases. The effects of triggers, dam materials, and geomorphic characteristics of landslide dams on dam stability are comprehensively analyzed. Various evaluation indexes of landslide dam stability are assessed based on this database, and stability evaluation can be further improved by considering the dam materials. Stability analyses of aftershocks, surges, and artificial engineering measures on landslide dams are summarized. Overtopping and seepage failures are the most common failure modes of landslide dams. The failure processes and mechanisms of landslide dams caused by overtopping and seepage are reviewed from the perspective of model experiments and numerical analyses. Finally, the research gaps are highlighted, and pathways to achieve a more complete understanding of landslide dam stability are suggested. This comprehensive review of the recent advances in stability and failure mechanisms of landslide dams can serve as a key reference for stability prediction and emergency risk mitigation.

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Section: Discontinuous Medium Methodsmentioning

confidence: 95%

Recent Advances in Stability and Failure Mechanisms of Landslide Dams

et al. 2021

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“…30 For the simulation of FSI-D problems with large movement of the solids, the optimal choice is combining the computational fluid dynamics (CFD) with the discontinuous methods, for instance, the discrete element method (DEM). 31 A significant attempt is the establishment of the CFD-DEM (CFDEM) methods, [32][33][34][35] in which the simulation of the coupling between the fluid and the discontinuous solids with arbitrary large movement is accomplished. However, the FSI force in the CFDEM methods is simplified as the drag force determined by the void fraction, and the common empirical formulas were provided by Ergun 36 or Di Felice.…”

Section: Discussionmentioning

confidence: 99%

A resolved CFDEM method for the interaction between the fluid and the discontinuous solids with large movement

Jia

Zhao

Liu

et al. 2019

Numerical Meth Engineering

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Summary A novel resolved combination of the computational fluid dynamics and the discrete element method (CFDEM) is proposed for the simulation of the strong coupling between the fluid and the discontinuous solids with large movement. The fluid flow governed by the full Navier‐Stokes equations is simulated using fixed grids based on the Eulerian framework, whereas the motion of the discontinuous solids is modeled by the discrete element method using the Lagrangian description. The key challenge, namely, the representation of the moving interfaces between the fluid and the solids in different frameworks, is handled by the immersed boundary method. Meanwhile, the governing equations of the coupled system are solved by the partitioned method in an iterative way to achieve a strong coupling effect. The breakthrough of the proposed resolved CFDEM method lies in the calculation of the fluid flow in fixed grids with high resolution, along with an accurate simulation of the interaction between the fluid and the discontinuous solids with arbitrary shapes and large movement. The reliability and the accuracy of the new method are validated by calculating several well‐known benchmark examples. Good agreements are achieved between the present and the known results.

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“…The coupling scheme of DEM with CFD involves two sets of discrete equations to be solved: the flow rule defined in Equations (19) and (20) for all VPs and the law of motion in DEM for all discrete elements (Section 2). The two-way coupling scheme is based on a transfer of pressure and shear stress forces from CFD to DEM and the time derivative of VP volumes from DEM to CFD.…”

Section: Two-phase Fluid Flow Modelmentioning

confidence: 99%

“…Hu et al 13 applied FVM (OpenFOAM) for investigating both the kinetics of fines' removal and the micromechanisms of suffusioninduced deformation of soils. Intensive research works have also been carried out by applying LBM in coupling with DEM [14][15][16][17][18] To model a seepage-induced fine particle migration through the skeleton formed of coarse particles, Cheng et al 19 proposed a semi-resolved CFD-DEM model, wherein a resolved fictitious domain method was used to resolve the fluid flow around coarse particles and an unresolved method based on a locally averaging theory was adopted to describe interactions between fine particles and fluid flow. To study the complicated impacts of debris flow on flexible barriers, Li and Jidong 20 proposed a discrete-based approach to couple CFD with DEM, wherein they solved the continuity equation and the locally averaged Navier-Stokes equation in a discretized fluid domain.…”

Section: Introductionmentioning

confidence: 99%

Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Krzaczek

Nitka

Tejchman

2020

Num Anal Meth Geomechanics

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The paper focuses on the effect of the gas content in rock macropores on a hydraulic fracturing process. The process was simulated by combining the discrete element method (DEM) with computational fluid dynamics (CFD) under two‐dimensional (2D) isothermal conditions. The mechanical behavior of the rock matrix was simulated with DEM, and CFD was used for describing the behavior of laminar two‐phase fracturing fluid (liquid and gas) flow in pre‐existing and newly developed fractures. Geometry changes of pores and fractures in the rock matrix were precisely reproduced. Fully coupled hydro‐mechanical simulation tests were carried out with a rock segment of simplified particulate mesostructure under plane strain compression. The rock segment contained one or two injection slots. The effect of the initial gas‐phase content in macropores on the propagation of hydraulic fractures was estimated in numbers for different initial rock porosities. In addition, the influence of different pre‐existing discontinuities in the rock segment was studied. The main characteristics of a fractured rock segment due to a high‐pressure fluid injection were realistically reproduced with a proposed approach. The initial gas‐phase fraction in macropores and pre‐existing discontinuities were found to be strongly influential in the course of hydraulic fracturing.

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A semi-resolved CFD-DEM model for seepage-induced fine particle migration in gap-graded soils

Cited by 136 publications

References 60 publications

Recent Advances in Stability and Failure Mechanisms of Landslide Dams

Recent Advances in Stability and Failure Mechanisms of Landslide Dams

A resolved CFDEM method for the interaction between the fluid and the discontinuous solids with large movement

Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

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