Discrete and continuum modeling of granular flow in silo discharge

Tian, Tian; Su, Jinglin; Zhan, Jiewei; Geng, Shujun; Xu, Guangwen; Liu, Xiaoxing

doi:10.1016/j.partic.2017.04.001

Cited by 56 publications

(25 citation statements)

References 47 publications

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“…Interestingly, the results show that the flow rate is constant with the growing crystallized shell (Case A*) and decreases in the situation without the shell (Case C*), which questions the relationship between the flow rate and the roughness (or friction) of sidewalls. The flow rate in Case B* is smaller than that in both of Cases A* and C*, which verifies the influence of particle-particle friction reported in previous studies [22,23].…”

Section: Shear Layerssupporting

confidence: 88%

“…Similarly, DEM simulations by Gonzalez show that increasing wall roughness leads to a mass flow-funnel flow transition [21]. The discharge rate of a silo was reported to systematically decrease with increasing the surface roughness of the particles [22] or with increasing internal angle of friction of the granular material [23]. In the DEM simulations by Vidyapati the discharge rate decreased with increasing interparticle friction, but was insensitive to the wall friction [24].…”

Section: Introductionmentioning

confidence: 85%

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Shell Crystallization in Granular Hopper Flow

Zhang

Lin

Wang

et al. 2021

Preprint

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An interesting phenomenon that a layer of crystallized shell formed at the container wall during hopper flow is observed experimentally and is investigated in DEM simulation. Different from shear or vibration driven granular crystallization, our simulation shows during the hopper flow the shell layer is formed spontaneously from the stagnant zone at the base and grows at a constant rate to the top with no external drive. The growth rate of the shell is found linearly proportional to the rate of the hopper flow. This shell is static and served as a new wall, which changes the flow profiles and its stress properties, and in turn guarantees a constant flow rate.

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Section: Shear Layerssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 85%

Shell Crystallization in Granular Hopper Flow

Zhang

Lin

Wang

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…The discharge of silos is a difficult engineering problem typically modelled with the DEM [40,42]. The problem definition is based on that proposed by Chen et al [5], however, in this case the amount of material is higher.…”

Section: Test Case 3: Silo Dischargementioning

confidence: 99%

“…Granular materials are widely used in large civil constructions such as dams, embankments and railways [45]. Also, bulk materials are treated, processed or transported in many industrial processes [40]. In both cases, a better knowledge of the mechanical behaviour of this kind of materials is essential to improve the design of infrastructures and to increase the efficiency of industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of the integration scheme on the rotation of non-spherical particles with the discrete element method

et al. 2019

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The Discrete Element Method (DEM) is an emerging tool for the calculation of the behaviour of bulk materials. One of the key features of this method is the explicit integration of the motion equations. Explicit methods are rapid, at the cost of a limited time step to achieve numerical stability. First or second order integration schemes based on a Taylor series are frequently used in this framework and showed to be accurate for the translational and rotational motion of spherical particles. However, they may lead to relevant inaccuracies when non-spherical particles are used since the orientation implies a modification in the second order inertia tensor in the inertial reference frame. Specific integration schemes for non-spherical particles have been proposed in the literature, such as the 4 th order Runge-Kutta scheme presented by Munjiza et al. and the predictor-corrector scheme developed by Zhao and van Wachem which applies the direct multiplication algorithm for integrating the orientation. In this work, both methods are adapted to be used together with a Velocity Verlet scheme for the translational in

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“…Since CUNDALL put forward the discrete element method, PFC, DEM and other numerical simulation software based on the discrete element method have been widely used in the field of granular materials research [3][4][5]. But most research focus on the spherical materials, the ball element in PFC is often used to simulate grain particles in silos [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Macroscopic and microscopic simulation of silo granular flow based on improved multi-element model

Feng¹,

Yuan²

2019

J. vibroeng.

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In the PFC simulation of silo granular discharge, spherical particles were used in the traditional model, which could not accurately reflect macroscopic and mesoscopic mechanism during discharge of wheat, rice and other particles with non-spherical shapes. This research provides an improved multi-element model consisting of clump elements and ball elements. The model uses clump elements to simulate non-spherical grain particles and ball elements to simulate dust particles. The numerical simulation was carried out with the improved multi-element model, and the results are compared with the traditional simulation which uses the spherical ball elements and the experiment of grain discharge. It demonstrates that: (1) In terms of the normal wall pressure, the dynamic pressure fluctuation in flow with improved multi-element model is more gradual, and the discharge process lasts longer, the normal pressure simulation results are more accurate than the traditional model. (2) In terms of the meso-structure of the granular material, compared with traditional spherical ball model, the material packing porosity of the improved multi-element model decreases and the coordination number increases, which is denser and in consistent with the actual situation. (3) Particle shape would affect the meso-mechanical behavior of particles. The simulation results demonstrate that, compared with the traditional spherical ball model, the contact forces in the improved multi-element model increases, and the distribution of contact force chains is more uniform and denser; several arching force chains could be clearly seen in the improved multi-element model, which clearly reflects the dynamic change law of the instantaneous arch. The improved multi-element model established in this paper further improves the accuracy of simulation and reflects the dynamic changes of the normal pressure on the silo wall, granular material structure and meso-mechanical parameters during grain discharge.

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Discrete and continuum modeling of granular flow in silo discharge

Cited by 56 publications

References 47 publications

Shell Crystallization in Granular Hopper Flow

Shell Crystallization in Granular Hopper Flow

Effect of the integration scheme on the rotation of non-spherical particles with the discrete element method

Macroscopic and microscopic simulation of silo granular flow based on improved multi-element model

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