Granular avalanches of entangled rigid particles

Huet, Damien P.; Jalaal, Maziyar; Beek, Rick van; Meer, Devaraj van der; Wachs, Anthony

doi:10.1103/physrevfluids.6.104304

Cited by 8 publications

(6 citation statements)

References 58 publications

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“…This scheme refers to a class of methods that approximate the complex shape of grains by aggregating a set of simple geometric primitives such as points, discs, spheres or cylinders. There are two prevailing approaches to aggregating primitives: one simply clumps the primitives together to obtain the best-fit shape profile by allowing arbitrary overlapping between the primitives, exemplified by such methods as sphere-clump particles 37 and cross-shaped particles 38 ; the other is the so-called cluster approach in which the overlap between the primitives is constrained by taking interprimitive interactions into consideration. Typical methods in this category include the sphere-cluster particle and the point-cluster (cloud) particle 27 .…”

Section: Technical Reviewmentioning

confidence: 99%

The role of particle shape in computational modelling of granular matter

Zhao,

Luding

2023

Nat Rev Phys

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Granular matter is ubiquitous in nature and is present in diverse forms in important engineering, industrial and natural processes. Particle-based computational modelling has become indispensable to understand and predict the complex behaviour of granular matter in these processes. The success of modern computational models requires realistic and efficient consideration of particle shape. Realistic particle shapes in naturally occurring and engineered materials offer diverse challenges owing to their multiscale nature in both length and time. Furthermore, the complex interactions with other materials, such as interstitial fluids, are highly nonlinear and commonly involve multiphysics coupling. This Technical Review presents a comprehensive appraisal of state-of-the-art computational models for granular particles of either naturally occurring shapes or engineered geometries. It focuses on particle shape characterization, representation and implementation, as well as its important effects. In addition, the particles may be hard, highly deformable, crushable or phase transformable; they might change their behaviour in the presence of interstitial fluids and are sensitive to density, confining stress and flow state. We describe generic methodologies that capture the universal features of granular matter and some unique approaches developed for special but important applications. Sections• Consideration of shape effects in coupled simulations of granular particles and environmental fluids requires revamped theories and methods to faithfully reflect their underpinning multiphase, multiphysics nature.• Incorporating realistic particle shapes in granular matter modelling must harness the latest advances in parallel computing and machine learning for effective large-scale computations.Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Section: Technical Reviewmentioning

confidence: 99%

The role of particle shape in computational modelling of granular matter

Zhao,

Luding

2023

Nat Rev Phys

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“…In experiments, for example, the technology of 3D printing has allowed one to precisely control the shape of particles to be later assembled in structures [31]. Although some studies have performed qualitative characterization of the resistance of non-convex particle assemblies [5,9,10,32], only a few have quantitatively assessed their mechanical response and packing properties [11,[33][34][35][36]. The current technological capabilities suggest that hundreds -or even thousands -of particles can be built and tested in standard devices (triaxial, shear cells, rheometers, etc.).…”

Section: Physical Experimentsmentioning

confidence: 99%

Bespoke particle shapes in granular matter

2022

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Among granular matter, one type of particle has special properties. Upon being assembled in disordered configurations, these particles interlock, hook, almost braid, and – surprisingly, considering their relatively low packing fractions – show exceptional shear strength.Such is the case of non-convex particles. They have been used in the shapes of tetrapods, ‘L’, ‘Z’, stars, and many others, to protect coasts or build self-standing structures requiring no binders or external supports. Although these structures are often designed without a comprehensive mechanical characterization, they have already demonstrated great potential as highly resistant construction materials. Nevertheless, it is natural to attempt to find the most appropriate non-convex shapes for any given application. Can a particle shape be tuned to obtain a desired mechanical behavior? Although this question cannot be answered yet, current technological, simulation, and experimental developments strongly suggest that it can be resolved in the next decade. A clear understanding of the relationships between particle shapes, mechanical response, and packing properties will be key to providing insights into the behavior of these materials. Such work should stand on 1) robust and general shape descriptors that encode the complexity of non-convex shapes (i.e., the number of arms, the symmetries, and asymmetries of the bodies, the presence of holes, etc.), 2) the analysis of the response of assemblies under different loading conditions, and 3) the disposition and reliability of non-convex shapes to ensure durability. The manufacturing process and an efficient use of resources are additional elements that could further help to optimize particle shape. In the quest of designing bespoke non-convex particles, this paper consolidates the challenges that remain unresolved. It also outlines some routes to explore based on the latest developments in technology and research.

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“…[9][10][11][12] Nonconvex particles composed of several arms, for example, can be assembled into vertical walls. [12][13][14] Such a configuration corresponds to an angle of repose of 901, a geometry that can be obtained with rounded particles only if cohesive bonds are added between particles. For this reason, shape-induced enhanced strength has been coined 'geometrical cohesion'.…”

Section: Introductionmentioning

confidence: 99%