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Particulate Discrete Element Modelling: A Geomechanics Perspective

TL;DR: The use of DEM in Geomechanics Calculation of Contact Forces Particle Motion Particle Types Boundary Conditions Initial Geometry and Specimen Generation Time Integration and Discrete Element Modelling DEM Interpretation: A Continuum Perspective Postprocessing: Graphical Interpretation of DEM Simulations Basic Statistical Analysis of Particulate Systems Guidance on Running DEM Simulation DEM: Future and Ongoing Developments DEM:
Abstract: Introduction Use of DEM in Geomechanics Calculation of Contact Forces Particle Motion Particle Types Boundary Conditions Initial Geometry and Specimen Generation Time Integration and Discrete Element Modelling DEM Interpretation: A Continuum Perspective Postprocessing: Graphical Interpretation of DEM Simulations Basic Statistical Analysis of Particulate Systems Guidance on Running DEM Simulations DEM: Future and Ongoing Developments
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Journal ArticleDOI
TL;DR: In this paper, a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach is presented to simulate the behavior of fluid-particle interaction for applications relevant to mining and geotechnical engineering.

293 citations


Cites background or methods from "Particulate Discrete Element Modell..."

  • ...More recently, there has been a growing interest in exploring the soil behaviour using discrete modelling approaches, in sought for key mechanisms and mitigating measures for various geotechnical hazards (see [21] for a summary)....

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  • ...This may work favourably in some cases, such as in sand production in sandstone oil reservoir, but may be an adverse factor in other occasions, such as in the case of internal/surface erosion of embankment dams and soil slopes which may trigger instability and failure of these structures [21]....

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  • ...A typical CFD–DEM method solves the Newton's equations governing the motion of the particle system by DEM and the Darcy's law or the Navier–Stokes equation for the fluid flow by CFD, in consideration of proper interaction force exchanges between the DEM and the CFD (see [21,27,32,33,37])....

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Journal ArticleDOI
TL;DR: In this article, the authors focus on the modeling of complex granular flows employing the discrete element method (DEM) approach, including particle breakage and liquid induced, electrostatics, van der Waals forces.
Abstract: This review article focuses on the modeling of complex granular flows employing the discrete element method (DEM) approach. The specific topic discussed is the application of DEM models for the study of the flow behavior of nonspherical, flexible, or cohesive particles, including particle breakage. The major sources of particle cohesion—liquid induced, electrostatics, van der Waals forces—and their implementation into DEM simulations are covered. These aspects of particle flow are of great importance in practical applications and hence are the significant foci of research at the forefront of current DEM modeling efforts. For example, DEM simulations of nonspherical grains can provide particle stress information needed to develop constitutive models for continuum-based simulations of large-scale industrial processes.

212 citations

Journal ArticleDOI
TL;DR: In this article, the effect of railway vibrations on passenger comfort and track performance is evaluated and the most suitable mathematical and numerical modelling strategies for railway vibration simulation, along with mitigation strategies are discussed.

187 citations

Journal ArticleDOI
TL;DR: In this article, a 3D image of Reigate sand was used to characterize the internal features of a soil in 3D including quantification of particle morphology, i.e. particle sizes and shapes, have a marked influence on the mechanical response of granular materials including soils.

183 citations

Journal ArticleDOI
TL;DR: In this paper, a 3D discrete element method (DEM) was used to simulate the shear behavior of fresh and coal fouled ballast in direct shear testing and compared with the experimental results.
Abstract: This paper presents the three-dimensional discrete element method (DEM) that was used to study the shear behavior of fresh and coal fouled ballast in direct shear testing. The volumetric changes and stress-strain behavior of fresh and fouled ballast were simulated and compared with the experimental results. Clump logic in particle flow code in three dimensions (PFC3D) incorporated in a subroutine was used to simulate irregular-shaped particles in which groups of 10–20 spherical balls were clumped together in appropriate sizes to simulate ballast particles. Fouled ballast with a various void contaminant index (VCI) ranging from 20 to 70% VCI was modeled by injecting a specified number of miniature spherical particles into the voids of fresh ballast. The DEM simulation captures the behavior of fresh and fouled ballast as observed in the laboratory, showing that the peak shear stress of the ballast assembly decreases and the dilation of fouled ballast increases with an increasing VCI. Furthermore, th...

171 citations


Cites background from "Particulate Discrete Element Modell..."

  • ...…Lobo-Guerrero and Vallejo 2006; Lu and McDowell 2006; Hossain et al. 2007; Sitharam and Vinod 2008; Sitharam and Vinod 2009; Huang et al. 2009b; Thakur et al. 2010; Indraratna et al. 2010a; Wang and Gutierrez 2010; O’Sullivan et al. 2008; O’Sullivan and Cui 2009; O’Sullivan 2011), among others....

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  • ...This disparity between continuum mechanics and micro-mechanics has been further elaborated on by Liu (2006), Wang et al. (2007) and O’Sullivan (2011)....

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