A DEM-DLM/FD method for direct numerical simulation of particulate flows: Sedimentation of polygonal isometric particles in a Newtonian fluid with collisions

Wachs, Anthony

doi:10.1016/j.compfluid.2009.01.005

Cited by 111 publications

(109 citation statements)

References 52 publications

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“…Nonetheless, the important role of contact forces in dense suspensions has been highlighted in recent experimental works that unequivocally show that moderately-sheared highly-concentrated suspensions behave like dry granular materials (e.g., see [47]). As dry granular materials have long been known to be well modeled by a Discrete Element Method (DEM) (see [48,49] for a review), couplings between DEM and DNS solvers have recently emerged [33,50]. Yet, those works do not consider lubrication and a peculiar feature of our present model is that both lubrication and contact using DEM are considered.…”

Section: Introductionmentioning

confidence: 95%

“…This method actually encompasses different models (see [48,49] for a review) and the most common is the molecular dynamics variant developed in the 70s [67]. The consideration of DEM as a collision model in DNS simulations has recently emerged [33,50,68]. As the collisional time scale is much smaller than the fluid time scale, both phenomena can be decoupled so that DEM can be easily implemented as a separate submodel in the fluid solver.…”

Section: Collision Modelmentioning

confidence: 99%

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A fictitious domain approach for the simulation of dense suspensions

Gallier

Lemaire

Lobry

et al. 2014

Journal of Computational Physics

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Low Reynolds number concentrated suspensions do exhibit an intricate physics which can be partly unraveled by the use of numerical simulation. To this end, a Lagrange multiplier-free fictitious domain approach is described in this work. Unlike some methods recently proposed, the present approach is fully Eulerian and therefore does not need any transfer between the Eulerian background grid and some Lagrangian nodes attached to particles. Lubrication forces between particles play an important role in the suspension rheology and have been properly accounted for in the model. A robust and effective lubrication scheme is outlined which consists in transposing the classical approach used in Stokesian Dynamics to our present direct numerical simulation. This lubrication model has also been adapted to account for solid boundaries such as walls. Contact forces between particles are modeled using a classical Discrete Element Method (DEM), a widely used method in granular matter physics. Comprehensive validations are presented on various one-particle, two-particle or three-particle configurations in a linear shear flow as well as some O(10 3 ) and O(10 4 ) particle simulations.

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Section: Introductionmentioning

confidence: 95%

Section: Collision Modelmentioning

confidence: 99%

A fictitious domain approach for the simulation of dense suspensions

Gallier

Lemaire

Lobry

et al. 2014

Journal of Computational Physics

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“…It has been systematically compared to existing results from the literature: fixed or oscillating cylinder [12,13,18,21] ; unique cylindrical particle sedimenting in a vertical channel with either axial or asymmetric initial position [21,24] ; pairs of particles interacting in a vertical channel [8,21,24].…”

Section: Problem Description and Numerical Approachmentioning

confidence: 99%

Chaotic sedimentation of particle pairs in a vertical channel at low Reynolds number: Multiple states and routes to chaos

et al. 2016

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The sedimentation of a pair of rigid circular particles in a two-dimensional vertical channel containing a Newtonian fluid is investigated numerically, for terminal particle Reynolds numbers (Re T ) ranging from 1 to 10, and for a confinement ratio equal to 4. While it is widely admitted that sufficiently inertial pairs should sediment by performing a regular DKT oscillation (Drafting-Kissing-Tumbling), the present analysis shows in contrast that a chaotic regime can also exist for such particles, leading to a much slower sedimentation velocity. It consists of a nearly horizontal pair, corresponding to a maximum effective blockage ratio, and performing a quasiperiodic transition to chaos under increasing the particle weight. For less inertial regimes, the classical oblique doublet structure and its complex behavior (multiple stable states

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“…In the last decades, it can be found in the literature that the SIMMER code was successfully applied to a series of CDA assessment, such as the possible significant reduction in evaluated CDA energetics or the key individual accident phenomena (Morita, et al, 2003). In the multiphase flow containing solid particles, the collision contacts between particles increase drastically with increasing number of particles suspended in the fluid (Wachs, 2009). However, strong interactions between solid particles as well as particle characteristics are not taken into consideration in the fluid-dynamics models of SIMMER-III.…”

Section: Numerical Simulation Of a Self-leveling Experiments Using A Hmentioning

confidence: 99%

“…For example, Wachs (2009) concentrated his effort on coupling a distributed Lagrange multiplier/fictitious domain (DLM/FD) method with the DEM, and applied it to the sedimentation problem of polygonal isometric particles in a Newtonian fluid. Sturm, et al (2010) worked on a DEM-CFD coupling algorithm for the simulation of gas-solid flows and used it into industrial-scale pneumatic conveying.…”

Section: Numerical Simulation Of a Self-leveling Experiments Using A Hmentioning

confidence: 99%

Numerical simulation of a self-leveling experiment using a hybrid method

Guo

Morita

Tagami

et al. 2014

Mechanical Engineering Journal

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The postulated core disruptive accidents (CDAs) are regarded as particular difficulties in the safety analysis of liquid-metal fast reactors (LMFRs). In the CDAs, the self-leveling behavior of debris bed is a crucial issue, which greatly affects the relocation process and heat-removal capability of molten core. SIMMER-III is a fast reactor safety analysis code and successfully applied to a series of the CDA assessments. It is a 2D, multi-velocity-field, multiphase, multicomponent, Eulerian, fluid dynamics code coupled with a fuel-pin model and a space-and energy-dependent neutron kinetics model. However, strong interactions between solid particles, as well as particle characteristics, in multiphase flows with particles are not taken into consideration in SIMMER-III. In this article, a hybrid method is developed by coupling the discrete element method (DEM) with the multi-fluid model of SIMMER-III, and the numerical simulation of a simplified self-leveling experiment is presented. In the coupling algorithm, the governing equations of gas and liquid phases are solved by a time-factorization (time-splitting) method. Contact forces between particles and interactions between particles and fluid are considered in the DEM. Reasonable agreement between simulation results and corresponding experimental data can demonstrate the validity of the present method in simulating the self-leveling behavior of debris bed.

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A DEM-DLM/FD method for direct numerical simulation of particulate flows: Sedimentation of polygonal isometric particles in a Newtonian fluid with collisions

Cited by 111 publications

References 52 publications

A fictitious domain approach for the simulation of dense suspensions

A fictitious domain approach for the simulation of dense suspensions

Chaotic sedimentation of particle pairs in a vertical channel at low Reynolds number: Multiple states and routes to chaos

Numerical simulation of a self-leveling experiment using a hybrid method

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