Gotowe bibliografie tematyczne / Immersed Granular flows

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Gotowa bibliografia na temat „Immersed Granular flows”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Immersed Granular flows"

Amarsid, L., J. Y. Delenne, P. Mutabaruka, Y. Monerie, F. Perales i 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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Polanía, Oscar, Nicolás Estrada, Mathieu Renouf, Emilien Azéma i 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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Constant, Matthieu, Frédéric Dubois, Jonathan Lambrechts i 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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Jandaghian, Mojtaba, Abdelkader Krimi i Ahmad Shakibaeinia. "Enhanced weakly-compressible MPS method for immersed granular flows". Advances in Water Resources 152 (czerwiec 2021): 103908. http://dx.doi.org/10.1016/j.advwatres.2021.103908.

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DOPPLER, DELPHINE, PHILIPPE GONDRET, THOMAS LOISELEUX, SAM MEYER i MARC RABAUD. "Relaxation dynamics of water-immersed granular avalanches". Journal of Fluid Mechanics 577 (19.04.2007): 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 there is no inertia: the relaxation at a given time is controlled only by the slope angle at that time. This allows us to adapt a frictional model developed recently for dry or water-immersed grains flowing in stationary conditions. This model succeeds well in reproducing our unsteady avalanche flows, namely the flowing layer thickness, the granular flux and the temporal relaxation of the slope. When a water counter-flow is applied along the pile, the granular avalanches are slowed down and behave as if granular friction were increased by an amount proportional to the water flow. All these findings are also reproduced well with the same friction model by taking into account the additional fluid force.

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

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PAILHA, MICKAËL, i OLIVIER POULIQUEN. "A two-phase flow description of the initiation of underwater granular avalanches". Journal of Fluid Mechanics 633 (25.08.2009): 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 granular media when the flow is fully developed. Numerical solutions of the two-phase flow model are computed in the case of a uniform layer of granular material fully immersed in a liquid and suddenly inclined from horizontal. The predictions are quantitatively compared with experiments by Pailha, Nicolas & Pouliquen (2008), who have studied the role of the initial volume fraction on the dynamics of underwater granular avalanches. Once the rheology is calibrated using steady-state regimes, the model correctly predicts the complex transient dynamics observed in the experiments and the crucial role of the initial volume fraction. Quantitative predictions are obtained for the triggering time of the avalanche, for the acceleration of the layer and for the pore pressure.

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Hare, Jenna, i Alex E. Hay. "Remote acoustic measurement of the velocity within water-immersed gravity-driven granular flows". Journal of the Acoustical Society of America 148, nr 4 (październik 2020): 2484. http://dx.doi.org/10.1121/1.5146883.

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Constant, Matthieu, Frédéric Dubois, Jonathan Lambrechts i Vincent Legat. "Implementation of an unresolved stabilised FEM–DEM model to solve immersed granular flows". Computational Particle Mechanics 6, nr 2 (29.09.2018): 213–26. http://dx.doi.org/10.1007/s40571-018-0209-4.

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

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Rozprawy doktorskie na temat "Immersed Granular flows"

Fry, Benjamin. "Modélisation multi-échelle d'un lit granulaire entraîné par un écoulement cisaillé". Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0132.

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Dans cette thèse, on étudie le transport granulaire par charriage en régime établi d’un lit de grains soumis à un écoulement de Couette laminaire pour un rapport de densité fluide-grain de 2.5 et une gamme de nombre de Reynolds particulaire, Re p [0.1, 10], et de nombre de Shields, [0.1,0.7]. Toutes les échelles de cet écoulement diphasique (à l’exception des effets de lubrification) sont décrites via la résolution numérique des équations de Navier-Stokes en prenant en compte la présence des particules par une méthode de frontières immergées (IBM) couplée à un solveur granulaire (méthode des éléments discrets - DEM) qui résout les équations de Newton pour chaque particule ainsi que les contacts et frottements entre grains (résolution à l’échelle microscopique). Un changement d’échelle est ensuite effectué afin d’obtenir une description de l’écoulement via des champs continus équivalents (description à l’échelle mésoscopique). Les simulations IBM-DEM permettent de quantifier chacun des termes du modèle dit mésoscopique et de caractériser la rhéologie de chaque phase ainsi que du mélange. On effectue finalement un second changement d’échelle afin de réduire l’écoulement de grains observé à une singularité, qui correspond à une condition limite du point de vue de l’écoulement du fluide. Cette condition est du type de Navier. Les simulations IBM-DEM montrent que la longueur dite de glissement "équivalente" est directement proportionnelle au nombre de Shields
In this work, we consider the steady transport of a granular medium by a laminar Couette flow for a fixed density ratio of 2.5 and a range of particle Reynolds number, Re p [0.1, 10], and Shields number [0.1, 0.7]. All scales of this two-phase flow are captured (except for the lubrication effects). By solving the Navier-Stokes equations, taking into account the presence of particles using an Immersed Boundary Method (IBM) coupled to a granular solver (Discrete Elements Method - DEM) which solves the Newton equations for each particle, in particular grain-grain interactions (resolution at the microscopic scale). Up-scaling is then performed to describe the flow via equivalent continuous quantities (description at the mesoscopic scale). IBM-DEM simulations allow to quantify all the terms of the so-called mesoscopic model and to characterize the rheology of each phase and that of the equivalent mixture. A second up-scaling is finally performed to reduce the granular flow to a singularity, which corresponds to a boundary condition from the fluid view point. The boundary condition is of Navier’s type. The IBM-DEM simulations suggest that the corresponding "equivalent" slip-lenght scales as

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Mutabaruka, Patrick. "Modélisation numérique des milieux granulaires immergés : initiation et propagation des avalanches dans un fluide". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00984870.

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Les études présentées dans ce mémoire portent sur la simulation numérique et l'analyse physique des milieux granulaires immergés dans un fluide. Des développements numériques ont été réalisés pour coupler la méthode Lattice Boltzmann pour la dynamique du fluide avec la méthode Contact Dynamics en 2D et avec la méthode Molecular Dynamics en 3D pour la dynamique des grains. Ces outils numériques ont été utilisés pour étudier l'initiation des avalanches sur un plan incliné en fonction de la compacité initiale et de l'angle d'inclinaison en 3D. Les résultats sont en bon accord quantitatif avec les expériences et ont permis de mettre en évidence la stabilisation de la pente granulaire par une pression négative du fluide interstitielle induite par la dilatance, et l'évolution spatiotemporelle des grandeurs telles que la compacité et la déformation de cisaillement. Ces évolutions dans la phase de fluage qui précède la rupture de pente ont pu être mises à l'échelle par un modèle théorique incorporant la loi de Darcy et l'effet de la dilatance sur l'angle de frottement interne. L'analyse de la texture granulaire a révélé la distortion du réseau des contacts pendant le fluage et la saturation de l'anisotropie comme un critère de rupture. La propagation des avalanches granulaires a été étudiée dans une configuration 2D pour deux géométries différentes : 1) l'effondrement et l'étalement d'une colonne sous son propre poids, 2) l'étalement d'une pente sous l'effet d'une énergie cinétique injectée. Nous avons en particulier montré que la distance et la durée d'étalement obéissent à des lois de puissance en fonction du rapport d'aspect initial ou de l'énergie injectée. Le fluide exerce deux effets contradictoires : réduire les temps de relaxation et lubrifier les contacts. Ces effets ont été analysés dans le régime visqueux en fonction des conditions initiales et la viscosité du fluide.

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Tai, Yung-Hui, i 戴永惠. "Internal Imaging Measurement of Immersed Granular Flows in a Rotating Drum". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/75379597626019190670.

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碩士
臺灣大學
土木工程學研究所
98
In this thesis, immersed granular avalanches in a rotating drum are studied experimentally using particle tracking velocimetry (PTV). To observe internal motions, refractive index matched solid and liquid materials are used. A laser light sheet is then used to illuminate slices through the flow. Two-dimensional motions of both solid and liquid motions in the center plane are measured using a stationary laser light sheet. We then seek to measure the full three-dimensional positions and velocities of the solid grains by scanning the flow volume using a rotating light sheet. Fast scans are obtained using a special rotating mirror device, and calibrated in 3D using a trilinear coordinate transformation. The effect of varying the drum rotation rate is examined. Measurements in 2D and 3D are obtained for avalanches of 1500 spherical grains.

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Gouda, Prachi Pragyan. "Refractive-Index-Matched Fluorescent Particle Image Velocimetry for Investigation of Flow in Immersed Granular Materials". Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5820.

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Refractive-Index-Matched Fluorescent Particle Image Velocimetry for Investigation of Flow in Immersed Granular Materials The ubiquity of granular materials and their importance in everyday life, industry, and nature make their study imperative for proper manipulation of the flow. As granular materials are opaque, optical imaging experiments are limited to studies at the free surface or transparent boundaries of the flow. Though techniques like magnetic resonance imaging and X-ray tomography have been used to obtain information from the interior of the flow system, these studies are limited to a small class of granular materials. Therefore, a modified yet simple optical imaging technique that can access the bulk of the flow is desirable. Our study employs refractive-index-matched fluorescent particle image velocimetry (RIM FPIV) to obtain information about the bulk of the flow. In RIM FPIV, the system of dry granular materials is made transparent by adding a suitable liquid whose refractive index is close to that of the particles (glass beads). The addition of liquid results in immersed granular materials, in which the particles are completely submerged in the liquid. Reported literature indicates that immersed granular materials exhibit shear banding and rate-independent rheology at slow shear rates, just like dry granular materials. A recent study using discrete element method (DEM) simulations and experiments reports a dilation-driven vortex in dry granular materials in the slow flow regime. However, the opacity of the granular materials restricted the experimental studies to visualizing only the free surface of the flow. By utilizing the similarities between the two media, our study on an immersed granular medium could give us insight into the flow behaviour in the bulk of dry granular systems. In this thesis, we experimentally study the flow of immersed granular materials and compare our observations with that of dry granular media. We perform experiments on slowly sheared immersed granular materials in a cylindrical Couette and present velocity profiles for the free surface using conventional PIV and the bulk of the flow using RIM FPIV. We observe broadening of the shear band in immersed granular materials and explain how the presence of fluid in interstitial spaces is responsible for such behaviour. We also report increased radial flow in the free surface of immersed granular materials due to enhancement of dilation by the fluid. In our RIM FPIV experiments, the velocity profiles in the bulk of the flow show radially inward flow close to the free surface and radially outward flow close to the bottom of the Couette cell. This observation is consistent with the simulations previously performed on a system of dry granular materials, indicating a circulating axial flow. Therefore, this study is a good starting point for experimentally validating the secondary axial flow in the bulk of both immersed and dry granular materials.

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Części książek na temat "Immersed Granular flows"

Jalali, Payman, i Pertti Sarkomaa. "Rough Cylindrical Object Immersed in a Granular Stream of Hard Disks". W Traffic and Granular Flow ’07, 525–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-77074-9_57.

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Kumar, K., K. Soga i J. Y. Delenne. "Granular Flows in Fluid". W Discrete Element Modelling of Particulate Media, 59–66. The Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/bk9781849733601-00059.

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Underwater avalanches are a major risk to offshore structures. The mechanisms involved in the initiation and propagation of underwater granular avalanches are complex. They depend mainly on the slope angle, density, and quantity of material destabilised. Characterising the risk induced by such catastrophic flows requires the development of reliable models. Most models of submarine landslides assume a single homogeneous phase representing the grain-fluid mixture that is governed by a non-Newtonian fluid behaviour. Although successful in accounting for general phenomenology in a small computation time, such models, defined at a large scale, are limited in describing all features of seabed granular flows. Hence, it is important to understand the mechanism of underwater granular flows at the particle scale to develop a better up scaling model. A pending research issue is the parameterization of interactions between the water phase and the sediment phase. Owing to the number of flow variables involved and measurement imprecision, estimating such parameters from laboratory experiments remains difficult. In the present study, sub-particle scale numerical simulations are performed to understand the local phenomena of underwater granular flows. The Discrete Element Method (DEM) is coupled with the Lattice Boltzmann Method (LBM) for fluid-particle interactions in order to study the collapse of granular columns in fluids. The coupling of DEM and LBM enables the introduction of water phase to the solid phase and calculation of hydrodynamic forces on grains. D2Q9 Model in LBM is used to simulate the fluid phase. A parametric analysis is performed to assess the influence of permeability on the evolution of flow and run-out distances. The effect of hydrodynamic forces on the run-out evolution is analysed by comparing the mechanism of energy dissipation and flow evolution in dry and immersed granular flows.

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Streszczenia konferencji na temat "Immersed Granular flows"

Bisognin, Priscilla Corrêa, José Mozart Fusco i Cíntia Soares. "Euler-Euler CFD Study of Heat Transfer in Fluidized Beds with an Immersed Surface Using the Kinetic Theory of Granular Flows". W XXXVI Iberian Latin American Congress on Computational Methods in Engineering. Rio de Janeiro, Brazil: ABMEC Brazilian Association of Computational Methods in Engineering, 2015. http://dx.doi.org/10.20906/cps/cilamce2015-0585.

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