Drag, lift, and buoyancy forces on a single large particle in dense granular flows

Article Mechanics

Segregation forces in dense granular flows: closing the gap between single intruders and mixtures

Yifei Duan et al.

Summary: By using simulations and a virtual-spring-based approach, the segregation force in size-bidisperse sphere mixtures is measured, and a semiempirical model is developed to extend its applicability.

JOURNAL OF FLUID MECHANICS (2022)

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Article Computer Science, Interdisciplinary Applications

LAMMPS-a flexible simulation tool for particle-based materials modeling at the atomic, meso, and continuum scales

Aidan P. Thompson et al.

Summary: LAMMPS, a classical molecular dynamics simulator released as an open source code in 2004, has gained popularity for its wide variety of particle interaction models, platform compatibility, and user control over simulation details. With contributions from numerous developers, it has grown from 50,000 lines of code to a million today, showcasing new capabilities like dynamic load balancing and quantum-accuracy machine learning interatomic potentials.

COMPUTER PHYSICS COMMUNICATIONS (2022)

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Article Mechanics

A unified description of gravity- and kinematics-induced segregation forces in dense granular flows

Lu Jing et al.

Summary: Particle segregation in flowing granular materials exhibits complex phenomena that can be described with a scaling law involving gravity-induced pressure gradient and shear rate gradient terms dependent on particle size ratio. This scaling law has been validated in various flow configurations without the need for re-fitting, and predictions regarding segregation direction based on intruder weight match experimental and computational results.

JOURNAL OF FLUID MECHANICS (2021)

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Article Physics, Fluids & Plasmas

Granular buoyancy in the context of segregation of single large grains in dense granular shear flows

M. P. van Schrojenstein Lantman et al.

Summary: The study provides a new micromechanical analysis that connects the microscale contact behavior to the macroscopic granular buoyancy force, supporting the existing Voronoi approximation for calculation of the buoyancy force. The findings also substantiate the decomposition of the net force into buoyancy and segregation lift, ultimately aiding the development of new models for size segregation by linking micro and macro behavior closely.

PHYSICAL REVIEW FLUIDS (2021)

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Article Physics, Fluids & Plasmas