Sensitivity analysis of the dynamics of fine and ultrafine particles using DEM

Leszczyński, Jacek

doi:10.1007/s11071-022-07973-8

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…The bottleneck in DEM simulation is the computational cost that is mainly determined by simulation time-step and the number of particles in the simulation setup. The usual approach to run the simulations within a reasonable cost is reducing the number of particles compared to the realistic systems by scaling up the particle size [9,10]. This results in an unrealistic estimate of the the model parameters since critical forces in the particle interaction, such as adhesion, are strongly size dependent [11].…”

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confidence: 99%

Calibration of AM powders for Optimization of Recoating Applications using DEM

Sani,

Quist,

Jarateg

et al. 2023

VIII International Conference on Particle-Based Methods

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Additive Manufacturing (AM) has been a subject of significant attention from both industrial manufacturers and research communities. However, several challenges hinder the widespread implementation of this technology in the industry. Powder recoating is a crucial step in powder-bed AM process that involves achieving a uniformly packed bed of powder particles that are later melted by an energy source, such as a laser or electron beam. One of the main challenges is calibrating the contact model parameters accurately to match the flowability and spreadability of specific powder alloys. This paper proposes a Discrete Element Method (DEM) model calibration framework based on surrogate model optimisation. The study utilises a Revolution Powder Analyser (RPA) as the experimental reference system. The proposed method is demonstrated with two AM powder samples, Ti64 and Inconel 718. The results indicate that particle-particle friction, rolling resistance, and van der Waals (vdW) surface energy significantly affect the system responses. Furthermore, the validation results show good correspondence between the simulation with calibrated parameters and experimental data. Overall, proposed calibration framework has the potential to optimise powder recoating and to improve the accuracy and effectiveness of the additive manufacturing.

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mentioning

confidence: 99%

Calibration of AM powders for Optimization of Recoating Applications using DEM

Sani,

Quist,

Jarateg

et al. 2023

VIII International Conference on Particle-Based Methods

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Particle Collision Study Based on a Rotational Boundary Condition

Zhao

Lin

et al. 2023

JMSE

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The main engineering machinery for the hydrodynamic lifting of seafloor mineral particles is rotor machinery with rotating impeller motion. It is important to study the rebound mechanism of collisions between particles and rotating walls to improve the accuracy of numerical simulation of rotor machinery. In this study, the law of motion change after collisions between particles and rotating walls is investigated using an experimental research method. The results show that the deflection angle of the particles after collision decreases with increases in the rotational speed of the wall, and the spin angular velocity increases with increases in the rotational speed of the wall. The normal velocity coefficient of restitution under the rotating wall is not affected by the rotational speed of the wall. The tangential coefficient of restitution under rotational boundary condition is smaller than the tangential coefficient of restitution under the stationary wall, and the higher the rotational speed, the closer it is to the coefficient of restitution under the stationary wall. During collision in the experiment, the main mode of contact between the particle and the rotating wall is sliding contact. Sliding friction between the particle and the rotating wall results in energy loss in the tangential velocity of the particle, and also provides energy for deflection of the particle’s trajectory and increased kinetic energy from the spin angular velocity; sliding friction loss is affected by the speed of the wall.

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Sensitivity analysis of the dynamics of fine and ultrafine particles using DEM

Cited by 2 publications

References 29 publications

Calibration of AM powders for Optimization of Recoating Applications using DEM

Calibration of AM powders for Optimization of Recoating Applications using DEM

Particle Collision Study Based on a Rotational Boundary Condition

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