Extended CFD–DEM for free‐surface flow with multi‐size granules

Jing, Lü; Kwok, C. Y.; Leung, Yiu-Wing; Sobral, Y. D.

doi:10.1002/nag.2387

Cited by 132 publications

(73 citation statements)

References 17 publications

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“…(14)) to achieve the coupling between fluid boundary and solid boundary nodes. Meanwhile, the hydrodynamic forces can be calculated by Equations (19) and (20).…”

Section: Algorithm Of Imbmentioning

confidence: 99%

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A coupled 3‐dimensional bonded discrete element and lattice Boltzmann method for fluid‐solid coupling in cohesive geomaterials

Wang

Feng

Pande

et al. 2018

Num Anal Meth Geomechanics

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Summary This paper presents a 3D bonded discrete element and lattice Boltzmann method for resolving the fluid‐solid interaction involving complicated fluid‐particle coupling in geomaterials. In the coupled technique, the solid material is treated as an assembly of bonded and/or granular particles. A bond model accounting for strain softening in normal contact is incorporated into the discrete element method to simulate the mechanical behaviour of geomaterials, whilst the fluid flow is solved by the lattice Boltzmann method based on kinetic theory and statistical mechanics. To provide a bridge between theory and application, a 3D algorithm of immersed moving boundary scheme was proposed for resolving fluid‐particle interaction. To demonstrate the applicability and accuracy of this coupled method, a benchmark called quicksand, in which particles become fluidised under the driving of upward fluid flow, is first carried out. The critical hydraulic gradient obtained from the numerical results matches the theoretical value. Then, numerical investigation of the performance of granular filters generated according to the well‐acknowledged design criteria is given. It is found that the proposed 3D technique is promising, and the instantaneous migration of the protected soils can be readily observed. Numerical results prove that the filters which comply with the design criteria can effectively alleviate or eliminate the appearance of particle erosion in dams.

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“…(14)) to achieve the coupling between fluid boundary and solid boundary nodes. Meanwhile, the hydrodynamic forces can be calculated by Equations (19) and (20).…”

Section: Algorithm Of Imbmentioning

confidence: 99%

“…The DEM‐CFD is attractive because of its computational convenience. Recent application of DEM‐CFD in geomechanics can be found in the references . However, the weakness of this method is the treatment of complicated fluid‐particle coupling based on a set of semi‐empirical equations.…”

Section: Introductionmentioning

confidence: 99%

A coupled 3‐dimensional bonded discrete element and lattice Boltzmann method for fluid‐solid coupling in cohesive geomaterials

Wang

Feng

Pande

et al. 2018

Num Anal Meth Geomechanics

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“…The particle distribution was evaluated when a sufficient time has elapsed after the shaking was stopped. To calculate the motion of fluid and particle behavior, the authors have developed a numerical model by coupling the Computational Fluid Dynamics (CFD) with the Discrete Element Method (DEM) [5][6]. CFD expresses the culture medium behavior by solving continuity and Navier-Stokes equations.…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of particle dispersion in a pre-processing of a static culture

et al. 2019

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For producing high-quality induced pluripotent stem (iPS) cells in a static culture, initial placement of cells is one of the most important factors. Dense distribution of cells increases the risk of cell death. Thus, the cells need to be uniformly distributed during the preprocess of a static culture. This process depends on the operator’s experiences and has not been standardized. In this study, the authors have performed numerical simulations to investigate the efficient of cell dispersion by using OpenFOAM. The numerical domain is a square-shaped dish. Two shaking methods, one-direction and multi-direction reciprocal shaking, were considered and calculations were conducted under five oscillation frequencies. The cell colony was assumed as a solid spherical particle. The initial particles were densely positioned at the center. The numerical result showed that the multi-direction reciprocal shaking was more effective to disperse the particles than the one-direction reciprocal shaking. In addition, almost all particles at low frequency sank to the bottom and hardly dispersed. These results indicate that strong fluctuations can lift particles from the bottom, and frequent change of flow direction makes distribution area wide.

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“…The importance of particle morphology has also been recognized by numerical modelling who have considered the solid-solid or fluid-solid interaction of particles (e.g. George and Iverson, 2014;Mead and Cleary, 2015;Jing et al, 2016). By means of the Discrete Element Method (DEM), Rait et al (2012) confirmed that the dynamic fragmentation is indeed important to the spreading behaviour of rock avalanches.…”

Section: Introductionmentioning

confidence: 92%

Experimental insight into the particle morphology changes associated with landslide movement

2018

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Rainfall-induced landslides are major natural hazards that are inherently inter-disciplinary crossing various fields (from geology to hydrology) and scales (particle level to catchment scale and beyond). Comparatively, very few studies on landslides have been conducted at the particle level with most research focusing on particle breakage or the effect of particle size and shape on the macro-scale and particle contact behaviour. Limited evidence suggests that soils under shear undergo changes not only of size, but also of shape and surface roughness. However, the particle morphology descriptors used are frequently qualitative so that information on how the soil particles are damaged during landsliding remains incomplete. This paper uses quantitative particle morphology descriptors, namely particle size, shape and particle surface roughness to investigate particle damage during landslide-induced shearing. A series of ring shear tests were conducted to simulate landslide movement in completely decomposed volcanic rocks (CDV), a typical soil in Hong Kong that was retrieved from a debris flow. Particle size, shape and surface roughness were analyzed on original CDV particles and on samples subjected to ring shear testing. Owing to the crushable nature of the soil, particle breakage was the key factor controlling particle morphology, with the results revealing an intricate dependency of shape and surface roughness on particle size. Shearing enhanced the bimodal gradation of the soil, with the larger grains more rounded and smoother and the resulting fines with a more irregular shape. This may be attributed to a combination of chipping and abrasion of the coarser particles. Further research is needed to ascertain the effect of such particle morphology changes to landslide movement.

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Extended CFD–DEM for free‐surface flow with multi‐size granules

Cited by 132 publications

References 17 publications

A coupled 3‐dimensional bonded discrete element and lattice Boltzmann method for fluid‐solid coupling in cohesive geomaterials

A coupled 3‐dimensional bonded discrete element and lattice Boltzmann method for fluid‐solid coupling in cohesive geomaterials

Numerical simulation of particle dispersion in a pre-processing of a static culture

Experimental insight into the particle morphology changes associated with landslide movement

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