On the impact of dry granular flow against a rigid barrier with basal clearance via discrete element method

Landslides ◽  
2021 ◽  
Author(s):  
Weigang Shen ◽  
Gang Luo ◽  
Xiaoyan Zhao
Keyword(s):  
Discrete Element Method ◽  
Granular Flow ◽  
Discrete Element ◽  
Rigid Barrier ◽  
Dry Granular Flow ◽  
The Impact ◽  
Element Method

scholarly journals Numerical Simulation of Dry Granular Flow Impacting a Rigid Wall Using the Discrete Element Method

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0160756 ◽  
Author(s):  
Fengyuan Wu ◽  
Yunyun Fan ◽  
Li Liang ◽  
Chao Wang
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Granular Flow ◽  
Discrete Element ◽  
Rigid Wall ◽  
Dry Granular Flow ◽  
Element Method

scholarly journals Research on the Obstruction Process of Rigid Netting Barriers toward Granular Flow

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Yunyun Fan ◽  
Fengyuan Wu
Keyword(s):  
Discrete Element Method ◽  
Granular Flow ◽  
Engineering Application ◽  
Time History ◽  
Discrete Element ◽  
Primary Concern ◽  
Size Segregation ◽  
Protective Structures ◽  
The Impact ◽  
Element Method

With the advantages of a simple structure and rapid construction, the rigid netting barrier (RNB) exerts a good obstruction effect on granular flow and is a common engineering measure used to prevent geological disasters in the form of granular flows. However, due to the limitations of current measuring and testing techniques, it is difficult to obtain an accurate measurement of the granular flow velocity and the impact force of granular flow on the mesh structures that are of primary concern in the design of protective structures. To study the characteristics of the obstruction process of RNBs toward granular flow, a typical impact experiment involving granular flow was numerically simulated by the discrete element method, and the correctness and effectiveness of the calculation method were also verified. On this basis, the discrete element method was applied to simulate the obstruction process affecting granular flow under different RNB setting conditions, and the calculation results clearly present the phenomena that occur during the obstruction process of RNBs toward granular flow, such as “run-up,” “overflow,” “passing-through,” and “grain-size segregation.” By analyzing the effects of these phenomena on the obstruction efficiency and the time history of the forces acting on the RNB, the rational setting of an RNB was further discussed. This study can provide a reference for the engineering application of RNB.

scholarly journals Analysis of Wet Soil Granular Flow down Inclined Chutes Using Discrete Element Method

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2399
Author(s):  
Chuan Zhao ◽  
Linlin Jiang ◽  
Xin Lu ◽  
Xiang Xiao
Keyword(s):  
Surface Energy ◽  
Discrete Element Method ◽  
Granular Flow ◽  
Soil Structure ◽  
Geometric Model ◽  
Granular Matter ◽  
Discrete Element ◽  
Runout Distance ◽  
The Impact ◽  
Element Method

This paper presents numerical simulation and analysis of two numerical experiments of wet soil granular flow down inclined chutes based on the JKR(Johnson-Kendall-Roberts)-cohesion model of the discrete element method. JKR is a cohesive contact model, which can reflect the influence of van der Waals forces in the contact range to simulate cohesive granular matter. A surface energy coefficient kw was proposed to reflect the liquid surface tension between particles, and maximum surface energy (γmax) of wet soil composed of uniform particles was obtained at 0.2 J/m2. Computational results show that surface energy (γ) and granular size play significant roles in the simulation of wet soil granular flow. The larger surface energy is, and the stronger of adhesion between soil grains. Besides, surface energy also has a great effect on the average velocity and kinetic energy of the moist soil avalanches. With baffles on both sides of the inclined chute, the dry soil granular flow has the longest runout distance on the horizontal plane; with the increase of surface energy, the runout distance decreased gradually. However, without baffles on both sides of the geometric model, the runout distance of wet soil granular flow is farther, though expansion to the sides is more obvious. Wet soil with larger grains requires larger surface energy to maintain the soil structure intact during the sliding process. Furthermore, with the increase of granular size, the soil structure is not compact enough, and the cohesion between water and soil grains is extremely poor, which lead to the impact scope expanded of wet soil landslide disasters.

Discrete element method modeling of non-spherical granular flow in rectangular hopper

2010 ◽  
Vol 49 (2) ◽  
pp. 151-158 ◽  
Author(s):  
He Tao ◽  
Baosheng Jin ◽  
Wenqi Zhong ◽  
Xiaofang Wang ◽  
Bing Ren ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Granular Flow ◽  
Discrete Element ◽  
Element Method

Effect of Bed Depth on Granular Flow and Homogenization in a Vertical Bladed Mixer via Discrete Element Method

2015 ◽  
Vol 38 (7) ◽  
pp. 1195-1202 ◽  
Author(s):  
Tomas Barczi ◽  
Tereza Travnickova ◽  
Jaromir Havlica ◽  
Martin Kohout
Keyword(s):  
Discrete Element Method ◽  
Granular Flow ◽  
Discrete Element ◽  
Element Method

Simulation of Failure of a Fixed Beam Subjected to Impact Load Using Quadrilateral Discrete Element Method

2012 ◽  
Author(s):  
Rajesh P. Nair ◽  
C. Lakshmana Rao
Keyword(s):  
Discrete Element Method ◽  
Impact Analysis ◽  
Mechanical Response ◽  
Impact Load ◽  
Discrete Element ◽  
Failure Criteria ◽  
Discrete Elements ◽  
The Impact ◽  
Fixed Beam ◽  
Element Method

Discrete Element Method (DEM) is an explicit numerical scheme to model the mechanical response of solid and particulate media. In our paper, we are introducing Quadrilateral Discrete Element Method (QDEM) for the simulation of the separation of elements in fixed beam subjected to impact load. QDEM results are compared with other DEM results available in literature. Impact loads include two cases: (a) a half sine wave and (b) a penetrator hitting the fixed beam. Separation criteria used for the discrete elements is maximum principal stress failure criteria. In QDEM, convergence study for the response of fixed beam is obtained using MATLAB platform. Validation of quadrilateral elements in fixed beam is being carried out by comparing the results with empirical formula available in literature for the impact analysis.

Geo-engineered buffer capacity of two-layered absorbing system under the impact of rock avalanches based on Discrete Element Method

2016 ◽  
Vol 13 (5) ◽  
pp. 917-929 ◽  
Author(s):  
Yu-zhang Bi ◽  
Si-ming He ◽  
Xin-po Li ◽  
Yong Wu ◽  
Qiang Xu ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Buffer Capacity ◽  
Discrete Element ◽  
Rock Avalanches ◽  
The Impact ◽  
Element Method

Predicting the drag coefficient of a granular flow using the discrete element method

2009 ◽  
Vol 2009 (06) ◽  
pp. P06012 ◽  
Author(s):  
Lionel Favier ◽  
Dominique Daudon ◽  
Frédéric-Victor Donzé ◽  
Jacky Mazars
Keyword(s):  
Discrete Element Method ◽  
Drag Coefficient ◽  
Granular Flow ◽  
Discrete Element ◽  
Element Method

Continuum theory for rapid cohesive-particle flows: general balance equations and discrete-element-method-based closure of cohesion-specific quantities

2017 ◽  
Vol 832 ◽  
pp. 345-382 ◽  
Author(s):  
Kevin M. Kellogg ◽  
Peiyuan Liu ◽  
Casey Q. LaMarche ◽  
Christine M. Hrenya
Keyword(s):  
Kinetic Theory ◽  
Discrete Element Method ◽  
Impact Velocity ◽  
Normal Component ◽  
Discrete Element ◽  
Granular Temperature ◽  
Success Factor ◽  
Particle Flows ◽  
The Impact ◽  
Element Method

The continuum description of rapid cohesive-particle flows comprises the population balance, which tracks various agglomerate sizes in space and time, and kinetic-theory-based balances for momentum and granular energy. Here, fundamental closures are provided in their most general form. In previous population balances, the probability (‘success factor’) that a given collision results in agglomeration or breakage has been set to a constant even though it is well established that the outcome of a collision depends on the impact (relative) velocity. Here, physically based closures that relate the success factors to the granular temperature, a (continuum) measure of the impact velocity, are derived. A key aspect of this derivation is the recognition that the normal component of the impact velocity dictates whether agglomeration occurs. With regard to the kinetic-theory balances, cohesion between particles makes the collisions more dissipative, thereby decreasing the granular temperature. The extra dissipation due to cohesion is accounted for using an effective coefficient of restitution, again determined using the derived distribution of normal impact velocities. This collective treatment of the population and kinetic-theory balances results in a general set of equations that contain several parameters (e.g. critical velocities of agglomeration) that are cohesion-specific (van der Waals, liquid bridging, etc.). The determination of these cohesion-specific quantities using simple discrete element method simulations, as well as validation of the resulting theory, is also presented.

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