Discrete element modeling of granular hopper flow of irregular-shaped deformable particles

Lai, Zhengshou; Xia, Yidong; Chen, Qiushi

doi:10.1016/j.apt.2023.104106

Cited by 9 publications

(2 citation statements)

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“…Nevertheless, the focus of this t on lateral compression, limits its application in evaluating the load-bearing characterist of pebble beds. The hopper discharge analysis, detailed in references [22,23] and preval Experimental methodologies play a crucial role in validating numerical simulations, especially in the domain of DEM simulations [17]. These methods are essential for calibrating and verifying the accuracy of DEM simulations, ensuring the reliability of their outcomes.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the focus of this test on lateral compression, limits its application in evaluating the load-bearing characteristics of pebble beds. The hopper discharge analysis, detailed in references [22,23] and prevalent in sectors such as agriculture and medicine, excels in assessing how particle shape variations affect pebble properties. Nevertheless, the effectiveness of this method in analysing the loadcompaction behaviour of pebble beds is limited.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Load-Bearing Capacity of Pebble Aggregates

Liu,

Bai,

Liu

2024

Applied Sciences

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The load-bearing capacity of pebble aggregates plays a pivotal role in influencing the operational performance of uncontrolled trucks on arrester beds. The complexity of this phenomenon stems from the nonuniformity in the shapes of the pebbles and their stochastic arrangement within the beds, presenting notable challenges for traditional mathematical modelling techniques in precisely evaluating the contact dynamics of these aggregates. This study leverages the discrete element method (DEM) to extensively analyse the arrester bed aggregate of a standard truck escape ramp. The aforementioned mechanism entails the gathering of morphological parameters of irregularly shaped aggregate particles and introduces a novel method for constructing random shapes that adhere to the observed distribution characteristics. A discrete element model, grounded in the physical properties of these aggregates, is formulated. This study focuses on the aggregate’s load-bearing capabilities, scrutinising the mechanical behaviour of the aggregate particles at the macroscopic and microscopic scales. These insights offer substantial scientific contributions and practical implications for assessing the safety of escape ramps and determining essential parameters for the brake bed design.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Load-Bearing Capacity of Pebble Aggregates

Liu,

Bai,

Liu

2024

Applied Sciences

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A Novel Discrete Element Method for Smooth Polyhedrons and Its Application to Modeling Flows of Concave‐Shaped Particles

Wang,

Xu,

Liang

et al. 2024

Numerical Meth Engineering

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The smooth polyhedral model has been commonly used to construct non‐spherical particles with smooth surfaces, whereas it is mainly constrained to numerical simulations involving concave‐shaped particles. This constraint arises from the limitations imposed by the contact algorithm. In this study, the contact detection between smooth polyhedrons is simplified to that between dilated triangular elements, and a discrete element method for concave polyhedral particles with smooth surfaces is developed. Subsequently, an automatic mesh simplification algorithm is established to enhance the computational efficiency without compromising accuracy. In validating the smooth polyhedral model, the simulation results of a hexahedron colliding with a plane are found to agree favorably with the experimental results. Then, the elastic collisions between the convex and concave particles are analyzed, and the total kinetic energy before and after the particle collision remains unchanged. Furthermore, the influences of particle morphology on the packing fraction, flow fluctuation, flow rate, mixing rate, velocity distribution, and system energy in hoppers and rotating drums are analyzed, revealing the underlying flow characteristics of concave polyhedral granular materials with smooth surfaces.

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