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1

Polanía, Oscar, Nicolás Estrada, Mathieu Renouf, Emilien Azéma, and Miguel Cabrera. "Granular column collapse: The role of particle size polydispersity on the velocity and runout." E3S Web of Conferences 415 (2023): 02017. http://dx.doi.org/10.1051/e3sconf/202341502017.

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Geophysical mass flows involve particles of different sizes, a property termed polydispersity. The granular column collapse is a simplified experiment for studying transitional granular flows. Our research focuses on the role that polydispersity has on the velocity and runout distance of dry and immersed granular columns, undergoing a numerical and experimental study. Our results highlight that polydispersity does not have a strong effect on the collapse of dry columns. On the contrary, the collapse sequence of immerse granular columns strongly depend on the polydispersity level.
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2

Amarsid, L., J. Y. Delenne, P. Mutabaruka, Y. Monerie, F. Perales, and F. Radjai. "Scaling behavior of immersed granular flows." EPJ Web of Conferences 140 (2017): 09044. http://dx.doi.org/10.1051/epjconf/201714009044.

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3

Constant, Matthieu, Frédéric Dubois, Jonathan Lambrechts, and Vincent Legat. "An hybrid multiscale model for immersed granular flows." EPJ Web of Conferences 140 (2017): 09021. http://dx.doi.org/10.1051/epjconf/201714009021.

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4

Jandaghian, Mojtaba, Abdelkader Krimi, and Ahmad Shakibaeinia. "Enhanced weakly-compressible MPS method for immersed granular flows." Advances in Water Resources 152 (June 2021): 103908. http://dx.doi.org/10.1016/j.advwatres.2021.103908.

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5

DOPPLER, DELPHINE, PHILIPPE GONDRET, THOMAS LOISELEUX, SAM MEYER, and MARC RABAUD. "Relaxation dynamics of water-immersed granular avalanches." Journal of Fluid Mechanics 577 (April 19, 2007): 161–81. http://dx.doi.org/10.1017/s0022112007004697.

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We study water-immersed granular avalanches in a long rectangular cell of small thickness. By video means, both the angle of the granular pile and the velocity profiles of the grains across the depth are recorded as a function of time. These measurements give access to the instantaneous granular flux. By inclining the pile at initial angles larger than the maximum angle of stability, avalanches are triggered and last for a long time, up to several hours for small grains, during which both the slope angle and the granular flux relax slowly. We show that the relaxation is quasi-steady so that th
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6

Yang, G. C., L. Jing, C. Y. Kwok, and Y. D. Sobral. "A comprehensive parametric study of LBM-DEM for immersed granular flows." Computers and Geotechnics 114 (October 2019): 103100. http://dx.doi.org/10.1016/j.compgeo.2019.103100.

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7

PAILHA, MICKAËL, and OLIVIER POULIQUEN. "A two-phase flow description of the initiation of underwater granular avalanches." Journal of Fluid Mechanics 633 (August 25, 2009): 115–35. http://dx.doi.org/10.1017/s0022112009007460.

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A theoretical model based on a depth-averaged version of two-phase flow equations is developed to describe the initiation of underwater granular avalanches. The rheology of the granular phase is based on a shear-rate-dependent critical state theory, which combines a critical state theory proposed by Roux & Radjai (1998), and a rheological model recently proposed for immersed granular flows. Using those phenomenological constitutive equations, the model is able to describe both the dilatancy effects experienced by the granular skeleton during the initial deformations and the rheology of wet
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8

Hare, Jenna, and Alex E. Hay. "Remote acoustic measurement of the velocity within water-immersed gravity-driven granular flows." Journal of the Acoustical Society of America 148, no. 4 (2020): 2484. http://dx.doi.org/10.1121/1.5146883.

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9

Constant, Matthieu, Frédéric Dubois, Jonathan Lambrechts, and Vincent Legat. "Implementation of an unresolved stabilised FEM–DEM model to solve immersed granular flows." Computational Particle Mechanics 6, no. 2 (2018): 213–26. http://dx.doi.org/10.1007/s40571-018-0209-4.

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10

Szymanek, Ewa, Artur Tyliszczak, and Maciej Marek. "Numerical analysis of heat and mass transfer through beds of spherical and non-spherical elements." Journal of Physics: Conference Series 2367, no. 1 (2022): 012012. http://dx.doi.org/10.1088/1742-6596/2367/1/012012.

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Abstract Many issues related to mass and heat transfer through beds of granular materials are still not fully understood. In this work, non-isothermal turbulent flow is analysed within granular layers of spherical and non-spherical elements. We apply a volume penalization (VP) approach formulated in the framework of an immersed boundary technique (IB) on Cartesian computational meshes. It allows modelling flows around solid objects with almost arbitrarily complex shapes and in any form of contact. The validation of the solution accuracy is performed against ANSYS Fluent simulations using body-
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11

DBOUK, Talib. "A suspension balance direct-forcing immersed boundary model for wet granular flows over obstacles." Journal of Non-Newtonian Fluid Mechanics 230 (April 2016): 68–79. http://dx.doi.org/10.1016/j.jnnfm.2016.01.003.

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12

Cui, Kahlil F. E., Gordon G. D. Zhou, Lu Jing, Xiaoqing Chen, and Dongri Song. "Generalized friction and dilatancy laws for immersed granular flows consisting of large and small particles." Physics of Fluids 32, no. 11 (2020): 113312. http://dx.doi.org/10.1063/5.0024762.

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13

Carvalho, J. R. F. G., J. M. P. Q. Delgado, and M. A. Alves. "Diffusion cloud around and downstream of active sphere immersed in granular bed through which fluid flows." Chemical Engineering Science 62, no. 10 (2007): 2813–20. http://dx.doi.org/10.1016/j.ces.2007.02.009.

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14

Sarno, Luca, Yongqi Wang, Yih-Chin Tai, Maria Nicolina Papa, and Paolo Villani. "Chute flows of dry granular media: Numerical simulations by a well-posed multilayer model and comparisons with experiments." E3S Web of Conferences 415 (2023): 02018. http://dx.doi.org/10.1051/e3sconf/202341502018.

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Debris flows and avalanches are dangerous natural phenomena, characterized by the gravity-driven motion of granular media immersed in a fluid. For an appropriate hazard assessment or disaster mitigation by scenario investigation, it is crucial to capture the underlying dynamics of the granular solid phase. For this purpose, a multilayer depth-averaged approach represents a promising and computationally efficient tool over fully three-dimensional models. Here we use a mathematically well-posed multilayer model, which implements the µ(I)-rheology and a dilatancy law depending on the inertial num
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15

Hanes, Daniel M., and Douglas L. Inman. "Observations of rapidly flowing granular-fluid materials." Journal of Fluid Mechanics 150 (January 1985): 357–80. http://dx.doi.org/10.1017/s0022112085000167.

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The rapid shearing of a mixture of cohesionless glass spheres and air or water was studied in an annular, parallel-plate shear cell designed after Savage (1978). Two types of flow were observed. In the first type of flow the entire mass of the granular material was mobilized. At high shear rates the shear and normal stresses were found to be quadratically dependent upon the mean shear rate (at constant volume concentration), in general agreement with the observations of Bagnold (1954) and Savage & Sayed (1984), and the ‘kinetic’ theory of Jenkins & Savage (1983). The stresses were foun
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16

Krupička, Jan, Václav Matoušek, Tomáš Picek, and Štěpán Zrostlík. "Validation of laser-penetration- and electrical-conductivity-based methods of concentration measurement in flow with intense transport of coarse sediment." EPJ Web of Conferences 180 (2018): 02048. http://dx.doi.org/10.1051/epjconf/201818002048.

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Lack of experimentally determined information on inner structure of flows carrying large amount of coarse sediment is an important limitation for development and validation of appropriate mathematical models. Measurement of local flow properties is particularly difficult in case of coarse sediment due to specific features associated with high ratio of the sediment size to the flow depth. This paper focusses on two methods of evaluation of vertical concentration profiles in the flow of a mixture of plastic grains and water in a laboratory flume. The first one was proposed by B. Spinewine et al.
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17

Nordlund, Å., and R. F. Stein. "Solar Magnetoconvection." Symposium - International Astronomical Union 138 (1990): 191–211. http://dx.doi.org/10.1017/s0074180900044144.

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As a prelude to discussing the interaction of magnetic fields with convection, we first review some general properties of convection in a stratified medium. Granulation, which is the surface manifestation of the major energy carrying convection scales, is a shallow phenomenon. Below the surface, the topology changes to one of filamentary cool downdrafts, immersed in a gently ascending isentropic background. The granular downflows merge into more widely separated downdrafts, on scales of mesogranulation and super-granulation.The local topology and time evolution of the small scale, kilo Gauss,
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18

Tenneti, Sudheer, Mohammad Mehrabadi, and Shankar Subramaniam. "Stochastic Lagrangian model for hydrodynamic acceleration of inertial particles in gas–solid suspensions." Journal of Fluid Mechanics 788 (January 12, 2016): 695–729. http://dx.doi.org/10.1017/jfm.2015.693.

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The acceleration of an inertial particle in a gas–solid flow arises from the particle’s interaction with the gas and from interparticle interactions such as collisions. Analytical treatments to derive a particle acceleration model are difficult outside the Stokes flow regime, but for moderate Reynolds numbers (based on the mean slip velocity between gas and particles) particle-resolved direct numerical simulation (PR-DNS) is a viable tool for model development. In this study, PR-DNS of freely-evolving gas–solid suspensions are performed using the particle-resolved uncontaminated-fluid reconcil
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19

Dbouk, Talib, and S. Amir Bahrani. "Modeling of buoyancy-driven thermal convection in immersed granular beds." International Journal of Multiphase Flow 134 (January 2021): 103471. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2020.103471.

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20

Sun, Yunhui, Wentao Zhang, Yi An, Qingquan Liu, and Xiaoliang Wang. "Experimental investigation of immersed granular collapse in viscous and inertial regimes." Physics of Fluids 33, no. 10 (2021): 103317. http://dx.doi.org/10.1063/5.0067485.

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21

He, Kang, Huabin Shi, and Xiping Yu. "Effects of interstitial water on collapses of partially immersed granular columns." Physics of Fluids 34, no. 2 (2022): 023306. http://dx.doi.org/10.1063/5.0079468.

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22

Drame, Aboubacar Sidiki, Li Wang, and Yanping Zhang. "Granular Stack Density’s Influence on Homogeneous Fluidization Regime: Numerical Study Based on EDEM-CFD Coupling." Applied Sciences 11, no. 18 (2021): 8696. http://dx.doi.org/10.3390/app11188696.

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FLUENT and EDEM were applied to simulate liquid–solid coupling in a 3D homogenous fluidization. The dynamics of destabilization of the granular material immersed by homogeneous fluidization were observed. The effect of initial packing density of granular stack and fluidization rate on the fluidization’s transient regime, the configuration of particles in the fluidized bed and the variation of bed height were analyzed and discussed. According to the results, there was an original observation of a strong impact of the initial density of an initially static granular stack on the transient fluidiz
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23

Liu, Ping, Xianwen Ran, Qi Cheng, Wenhui Tang, Jingyuan Zhou, and Raphael Blumenfeld. "Locomotion of Self-Excited Vibrating and Rotating Objects in Granular Environments." Applied Sciences 11, no. 5 (2021): 2054. http://dx.doi.org/10.3390/app11052054.

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Many reptiles, known as ‘sand swimmers’, adapt to their specific environments by vibrating or rotating their body. To understand these type of interactions of active objects with granular media, we study a simplified model of a self-excited spherical object (SO) immersed in the granular bed, using three-dimensional discrete element method (DEM) simulations. Modelling the vibration by an oscillatory motion, we simulate the longitudinal locomotion of the SO in three modes: transverse vibration, rotation around different axes, and a combination of both. We find that the mode of oscillation in y d
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24

Amarsid, L., J. Y. Delenne, P. Mutabaruka, Y. Monerie, F. Perales, and F. Radjai. "Viscoinertial regime of immersed granular flows." Physical Review E 96, no. 1 (2017). http://dx.doi.org/10.1103/physreve.96.012901.

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25

Lacaze, Laurent, Joris Bouteloup, Benjamin Fry, and Edouard Izard. "Immersed granular collapse: from viscous to free-fall unsteady granular flows." Journal of Fluid Mechanics 912 (February 9, 2021). http://dx.doi.org/10.1017/jfm.2020.1088.

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26

Gauthier, Georges, and Philippe Gondret. "Compaction of liquid immersed granular packings by small upward flows." Physical Review Fluids 4, no. 7 (2019). http://dx.doi.org/10.1103/physrevfluids.4.074308.

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27

Polanía, Oscar, Nicolas Estrada, Emilien Azéma, Mathieu Renouf, and Miguel Cabrera. "Polydispersity effect on dry and immersed granular collapses: an experimental study." Journal of Fluid Mechanics 983 (March 21, 2024). http://dx.doi.org/10.1017/jfm.2024.176.

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The column collapse experiment is a simplified version of natural and industrial granular flows. In this set-up, a column built with grains collapses and spreads over a horizontal plane. Granular flows are often studied with a monodisperse distribution; however, this is not the case in natural granular flows where a variety of grain sizes, known as polydispersity, is a common feature. In this work, we study the effect of polydispersity, and of the inherent changes that polydispersity causes in the initial packing fraction, in dry and immersed columns. We show that dry columns are not significa
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28

Garzó, Vicente. "Towards a better understanding of granular flows." Journal of Fluid Mechanics 968 (July 26, 2023). http://dx.doi.org/10.1017/jfm.2023.494.

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Understanding the transport of particles immersed in a carrier fluid (bedload transport) is still an exciting challenge. Among the different types of gas–solid flows, when the dynamics of solid particles is essentially dominated by collisions between them, kinetic theory can be considered as a reliable tool to derive continuum approaches from a fundamental point of view. In a recent paper, Chassagne et al. (J. Fluid Mech., vol. 964, 2023, A27) proposed a two-fluid model based on modifications to a classical kinetic theory model (Garzó & Dufty, Phys. Rev. E, vol. 59, 1999, pp. 5895–5911). F
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29

Cui, Kahlil Fredrick, Gordon Zhou, and Lu Jing. "Simulation data and scripts for CFD-DEM simulation of immersed granular shear flows." April 17, 2021. https://doi.org/10.5281/zenodo.4661085.

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The following contains excel files containing measured segregation velocities from immersed plane sheared granular flows. Also included are sample CFD-DEM simulation files that can be used to replicate to replicate our results. Note that CFD-DEM module from LIGGGHTS CFDEMPROJECT have to be installed first before one can use this. LIGGGHTS version used is v.2.3.1 and OpenFOAM (for CFD) version used is 3.0.1. 
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30

Kanellopoulos, Giorgos. "Granular roll waves on a μ (J) rheology model: A dynamical systems perspective". Physics of Fluids 36, № 2 (2024). http://dx.doi.org/10.1063/5.0194336.

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This paper focuses on the formation and the unique characteristics of granular roll waves generated by utilizing the depth-averaged dynamic model recently introduced by Fei et al. [Appl. Math. Modell. 119, 763–781 (2023)], which employs μ(J) rheology. Notably, the symmetrical shape of the generated roll waves deviates from the typical pattern observed in both dry granular and water roll waves, which demonstrate a gradually rising flank followed by a sudden drop. Through a dynamical systems analysis and the associated phase space diagrams, which provide a comprehensive geometrical overview, we
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31

Worf, Dominik, Ali Khosronejad, Thomas Gold, Kevin Reiterer, Helmut Habersack, and Christine Sindelar. "A soft particle collision model based on the immersed boundary method for smooth strictly convex bodies." Physics of Fluids 37, no. 7 (2025). https://doi.org/10.1063/5.0273820.

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A novel collision model for strictly convex particles in granular flows is presented. The model is implemented into the framework of a sharp interface immersed boundary method with unstructured triangular immersed boundary grid systems. The points of common normals among different particles are calculated with a hybrid distance calculation algorithm. Stability problems arising from the flatness of the grid faces are mitigated by smoothing the motion of the contact points over discrete time, utilizing quadratic Bézier surfaces. The model is validated using existing experimental data, and our co
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32

C., Tsekos, de Voogt D., de Jong W., and Padding J.T. "Two phase modelling of Geldart B particles in a novel indirectly heated bubbling fluidized bed biomass steam reformer." Chemical Engineering Journal 439 (March 9, 2022). https://doi.org/10.1016/j.cej.2022.135681.

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This work focuses on the numerical modelling and experimental validation of the hydrodynamic behaviour of a novel 50 kWth indirectly heated bubbling fluidized bed steam reformer. The hydrodynamic behaviour of fluidized beds with immersed vertical tubes and complex fluidized bed geometries in general have not been thoroughly investigated in terms of numerical modelling coupled with experimental validation for pilot scale reactors. Therefore, the present study contributes to the fluidized bed hydrodynamics numerical modelling field, while investigating a novel reactor concept. Simulations were p
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33

Goddard, J. D. "Material Instability in Rapid Granular Shear Flow." MRS Proceedings 627 (2000). http://dx.doi.org/10.1557/proc-627-bb4.1.

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ABSTRACTThis is a survey of recent theoretical work on shear flow instabilities of dry granular media in the Bagnold or “grain-inertia” régime. Attention is devoted to steady homogeneous unbounded simple shear, with the goal of identifying material (constitutive) instabilities arising from the coupling of stress to granular concentration and temperature fields. Such instabilities, the dissipative analogs of thermodynamic phase transitions, are familiar in numerous branches of the mechanics of materials.The current interest is motivated in part by the “dissipative clustering” found in various p
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34

Vowinckel, Bernhard, Kunpeng Zhao, Rui Zhu, and Eckart Meiburg. "Investigating cohesive sediment dynamics in open waters via grain-resolved simulations." Flow 3 (2023). http://dx.doi.org/10.1017/flo.2023.20.

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Cohesive particulate flows play an important role in environmental fluid dynamics, as well as in a wide variety of civil and process engineering applications. However, the scaling laws, constitutive equations and continuum field descriptions governing such flows are currently less well understood than for their non-cohesive counterparts. Grain-resolved simulations represent an essential tool for addressing this shortcoming, along with theoretical investigations, laboratory experiments and field studies. Here we provide a tutorial introduction to simulations of fine-grained sediments in viscous
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35

Cui, Kahlil F. E., Gordon G. D. Zhou, and Lu Jing. "Viscous Effects on the Particle Size Segregation in Geophysical Mass Flows: Insights From Immersed Granular Shear Flow Simulations." Journal of Geophysical Research: Solid Earth 126, no. 8 (2021). http://dx.doi.org/10.1029/2021jb022274.

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36

Poulain, P., A. Le Friant, A. Mangeney, et al. "Performance and limits of a shallow-water model for landslide-generated tsunamis: from laboratory experiments to simulations of flank collapses at Montagne Pelée (Martinique)." Geophysical Journal International, December 6, 2022. http://dx.doi.org/10.1093/gji/ggac482.

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Summary We investigate the dynamics and deposits of granular flows and the amplitude of landslide-generated water waves using the HySEA depth-averaged shallow-water numerical model, both at laboratory and field scales. We evaluate the different sources of error by quantitatively comparing the simulations with (i) new laboratory experiments of granular collapses in different conditions (dry, immersed, dry flow entering water) and slope angles and (ii) numerical simulations made with the SHALTOP code that describes topography effects better than most depth-averaged landslide-tsunami models. For
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37

Fan, Jianhua, Chengzhi Zhu, Hongwei Wang, Jintong Xu, and Lu Wang. "Flow rate characterization for liquid-immersed granular medium discharging through a hopper." Physics of Fluids 35, no. 12 (2023). http://dx.doi.org/10.1063/5.0176605.

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The granular sample immersed in a viscous fluid discharge through an orifice connecting a pipe or no pipe has been numerically investigated. A two-dimensional fluid–particle model is adapted, which combines the discrete element method with the lattice Boltzmann method using the partial saturation boundary technique. The discharge rate of liquid-immersed granular media flowing from a hopper is parametrically analyzed by adding a pipe at the outlet, varying fluid properties and orifice sizes. The results show that the existence of the pipe significantly slows down the discharge rate compared wit
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38

Wang, Chi, Lubin Wei, and Yi An. "Particle dynamics in vertical vibration-driven immersed granular systems: A study with resolved computational fluid dynamics-discrete element method." Physics of Fluids 35, no. 12 (2023). http://dx.doi.org/10.1063/5.0179357.

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Vibration-driven immersed granular systems (VIGSs) are ubiquitous in nature and industry. However, particle dynamics in 3D VIGSs is hard to obtain directly from experiments. The resolved Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) is introduced to study a cylindrical VIGS subjected to vertical vibration focusing on particle dynamics. A Voronoi-weighted Gaussian interpolation (VWGI) method is used to convert the discrete particle information into a continuous field. The VWGI method enables the estimation of the continuous field for granular systems, especially for those with
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39

Polanía, Oscar, Miguel Cabrera, Mathieu Renouf, and Emilien Azéma. "Collapse of dry and immersed polydisperse granular columns: A unified runout description." Physical Review Fluids 7, no. 8 (2022). http://dx.doi.org/10.1103/physrevfluids.7.084304.

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40

Coppin, Nathan, Michel Henry, Miguel Cabrera, et al. "Collapse dynamics of two-dimensional dry and immersed granular columns of elongated grains." Physical Review Fluids 8, no. 9 (2023). http://dx.doi.org/10.1103/physrevfluids.8.094303.

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41

Coppin, Nathan, Matthieu Constant, Jonathan Lambrechts, Frédéric Dubois, and Vincent Legat. "Numerical analysis of the drag on a rigid body in an immersed granular flow." Computational Particle Mechanics, June 21, 2021. http://dx.doi.org/10.1007/s40571-021-00418-w.

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42

Zhao, Yifeng, Pei Zhang, Liang Lei, Lingwei Kong, Sergio Galindo-Torres, and Stan Z. Li. "Metaball-Imaging Discrete Element Lattice Boltzmann Method for fluid-particle system of complex morphologies with settling case study." Physics of Fluids, January 18, 2023. http://dx.doi.org/10.1063/5.0135834.

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Fluid-particle systems are highly sensitive to particle morphologies. While many attempts have been made on shape descriptors and coupling schemes, how to simulate the particle-particle and particle-fluid interactions with a balance between accuracy and efficiency is still a challenge, especially when complex-shaped particles are considered. This study presents a Metaball-Imaging (MI) based Discrete Element Lattice Boltzmann Method (DELBM) for fluid simulations with irregular shaped particles. The major innovation is the MI algorithm to capture the real grain shape for DELBM simulations, where
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