Rapid Generation of Particle Packs at High Packing Ratios for DEM Simulations of Granular Compacts

Campello, Eduardo M. B.; Cassares, Kamila Rodrigues

doi:10.1590/1679-78251694

Cited by 20 publications

(8 citation statements)

References 35 publications

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“…The spheres are widely seen in particle packing, Campello and Casares [10] use the spheres as particles, proposing a layered filling together with a compaction system for the spheres used in rectangular containers, the maximum density was 60%. Dynamic packings when focusing on physical simulations is that they only work with rectangular or cylindrical containers and sometimes both, that is, dynamic packings use at most two domains, this restricts the approach that is desired in this research, which is to cover any domain.…”

Section: Dynamic Packingsmentioning

confidence: 99%

Indexed Parallel Sphere Packing for Arbitrary Domains

Lajo¹,

Eduardo²

2022

Artificial Intelligence and Applications

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Particle packings are used to simulate granular matter, which has various uses in industry. The most outstanding characteristics of these are their density and their construction time, the density refers to the percentage of the space of the object filled with particles, this is also known as compaction or solid fraction. Particle packing seeks to be as dense as possible, work on any object, and have a low build time. Currently there are proposals that have significantly reduced the construction time of a packing and have also managed to increase the density of these, however, they have certain restrictions, such as working on a single type of object and being widely affected by the characteristics of the object. The objective of this work is to present the improvement of a parallel sphere packing for arbitrary domains. The packing to improve was directly affected in time by the number of triangles in the mesh of object. This enhancement focuses on creating a parallel data structure to reduce build time. The proposed method reduces execution time with a high number of triangles, but it takes up a significant amount of memory for the data structure. However, to obtain high densities, that is, densities between 60% and 70%, the sphere packing construction does not overwhelm the memory.

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Section: Dynamic Packingsmentioning

confidence: 99%

Indexed Parallel Sphere Packing for Arbitrary Domains

Lajo¹,

Eduardo²

2022

Artificial Intelligence and Applications

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“…[2,40,41] Computer simulations considering rigid particles demonstrate that a central force leads to hexagonal lattice packing. [42] A possible central force in the levitation plane is the interparticle secondary radiation force. As the observed aggregates remain stable for at least a few hours, we could selectively complete Raman acquisitions of any particle in the bead ensemble.…”

Section: Polystytene Particlesmentioning

confidence: 99%

3D‐Printed Acoustofluidic Devices for Raman Spectroscopy of Cells

Santos

Silva

et al. 2021

Adv Eng Mater

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Acoustofluidics technology can be used to trap live cells (and also micro/nanoparticles) in microenvironments suitable for cell assays. Herein, a cheap and easyto-fabricate device is proposed that works with Raman spectroscopy for biosensing applications. The device comprises a 3D-printed microchamber working as a halfwavelength acoustic resonator. By tuning the resonance frequency with a low voltage (%4 V), cells or particles are aggregated and levitated in seconds by the action of the acoustic radiation force. Based on finite element simulations, the radiation force field produced inside the device is described. In the cellular enrichment (aggregation) process, a metastable honeycomb lattice is formed mostly due to the cell-to-cell attraction caused by the secondary acoustic radiation force. Orderly and metastable levitating aggregates provide an excellent arrangement for Raman spectroscopy to investigate cells individually. Polystyrene particles are used for the device characterization and Raman acquisition process. Biosensing applications are showcased with live murine macrophages J774.A1, which are used in infection assay of leishmaniasis disease. The unique features of the device, e.g., simple fabrication process with cheap materials, simple operation, fast time response, and formation of metastable cellular aggregates; hold a noteworthy potential for applications in life sciences and biotechnology involving cell assays.

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“…Convection and radiation are not considered as to isolate the conduction problem and allow for a better estimate of the effective response. Other data are as follows: con = fric = 1.0 and rol = 0.2; • Pack generated through a random sequence addition method (Campello and Cassares [26]); • Time-step size: Δt = 2 × 10 4 s. Figure 9 shows snapshots of the system's configuration at selected time instants as obtained with our simulation (sequence is from left to right, top to down). Thermal equilibrium is reached at around t ≈ 350 s, wherein the particles' temperatures no longer change significantly between consecutive time steps.…”

Section: Conduction Through a 3d Particle Assemblymentioning

confidence: 99%

A coupled thermo-mechanical model for the simulation of discrete particle systems

Quintana-Ruiz

Campello

2020

J Braz. Soc. Mech. Sci. Eng.

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This work presents a computational model for the simulation of problems involving thermo-mechanically active particles forming discrete particle systems. Our approach is based on the discrete element method for description of the particles' dynamics, combined with simple heat transfer equations to describe the various thermal effects that may take place when the system is excited by temperature gradients and external heat sources. We are able to track the motion of the particles and their thermal states over time under the influence of body (e.g., gravitational) forces, contact and friction forces (and the related moments w.r.t. the particles' centers), as well as applied heat from external devices, heat transfer through conduction (at the particles' interfaces upon contact with other particles and objects), convective cooling and radiative effects. Numerical examples are provided to validate our scheme and illustrate its applicability to the simulation of a wide range of engineering applications. We believe that simple, consistent particle models of the type as shown here may be a useful tool to the modeling of discrete particle systems that are consisted of thermo-mechanically active particles and, in a broader sense, many other multiphysical discrete systems.

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Rapid Generation of Particle Packs at High Packing Ratios for DEM Simulations of Granular Compacts

Cited by 20 publications

References 35 publications

Indexed Parallel Sphere Packing for Arbitrary Domains

Indexed Parallel Sphere Packing for Arbitrary Domains

3D‐Printed Acoustofluidic Devices for Raman Spectroscopy of Cells

A coupled thermo-mechanical model for the simulation of discrete particle systems

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