A multiscale coupling approach between discrete element method and finite difference method for dynamic analysis

2015 ◽  
Vol 102 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Mingguang Li ◽  
Haitao Yu ◽  
Jianhua Wang ◽  
Xiaohe Xia ◽  
Jinjian Chen
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Difference Method ◽  
Discrete Element ◽  
Coupling Approach ◽  
Element Method

scholarly journals Numerical Investigation of Top Coal Drawing Evolution in Longwall Top Coal Caving by the Coupled Finite Difference Method-Discrete Element Method

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 219
Author(s):  
Yuming Huo ◽  
Defu Zhu ◽  
Zhonglun Wang ◽  
Xuanmin Song
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Discrete Element Method ◽  
Difference Method ◽  
Discrete Element ◽  
Recovery Ratio ◽  
Coal Recovery ◽  
Working Face ◽  
The Common ◽  
Longwall Top Coal Caving

In longwall top coal caving (LTCC), the resource recovery ratio of the working face is directly determined by the top coal recovery ratio. An investigation of the evolution of top coal drawing characteristics and revealing the evolution of top coal drawing parameters is necessary when providing guidance for caving parameter selection and improving the top coal recovery ratio. Based on in-situ measurements of the size distribution of caved top coal blocks in Wangjialing coal mine, a finite difference method (FDM)–discrete element method (DEM) coupled method was applied to establish a “continuous–discontinuous” numerical model and the process from the first coal drawing to the common coal drawing was simulated with 17 separate working face advances. The evolution of the drawing body (DB), loose body (LB), and top coal boundary (TCB) was obtained. The results show that, the evolution of parameters of DB such as shape and size, drawing amount, length and deflection angle of the long axis of the profile ellipsoid tended to decrease first, then increase, decrease again, and finally stabilise; the increment of the LB advance coal wall distance and the coal pillar distance was close to 0 m in the common coal drawing stage, while width increment of the LB was close to the drawing interval (0.865 m). The TCB formed after each coal drawing round was fitted based on the improved “Hook” function. The evolution of height and radius of curvature of TCB’s stagnation point was analysed. This was divided into three stages: the first (first to third drawing rounds) was the initial mining influence stage, the second (fourth to ninth drawing rounds) was the transitional caving stage, and the third (after tenth drawing round) was the common coal drawing stage.

Weighted Finite Difference and Boundary Element Methods Applied to Groundwater Pollution Problems

1991 ◽  
Vol 23 (1-3) ◽  
pp. 517-524
Author(s):  
M. Kanoh ◽  
T. Kuroki ◽  
K. Fujino ◽  
T. Ueda
Keyword(s):  
Boundary Element Method ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Boundary Element ◽  
Difference Method ◽  
Groundwater Pollution ◽  
Small Region ◽  
Boundary Element Methods ◽  
Computational Time ◽  
Element Method

The purpose of the paper is to apply two methods to groundwater pollution in porous media. The methods are the weighted finite difference method and the boundary element method, which were proposed or developed by Kanoh et al. (1986,1988) for advective diffusion problems. Numerical modeling of groundwater pollution is also investigated in this paper. By subdividing the domain into subdomains, the nonlinearity is localized to a small region. Computational time for groundwater pollution problems can be saved by the boundary element method; accurate numerical results can be obtained by the weighted finite difference method. The computational solutions to the problem of seawater intrusion into coastal aquifers are compared with experimental results.

Dynamic analysis of anti-dip bedding rock slopes reinforced by pre-stressed cables using discrete element method

2021 ◽  
Vol 130 ◽  
pp. 79-93
Author(s):  
Yun Zheng ◽  
Runqing Wang ◽  
Congxin Chen ◽  
Chaoyi Sun ◽  
Zhanghao Ren ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Discrete Element ◽  
Rock Slopes ◽  
Element Method

Nonlinear Dynamic Analysis of Space Frame Structures by Discrete Element Method

2014 ◽  
Vol 638-640 ◽  
pp. 1716-1719 ◽  
Author(s):  
Nian Qi ◽  
Ji Hong Ye
Keyword(s):  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Discrete Element ◽  
Internal Force ◽  
Frame Structures ◽  
Space Frame ◽  
Bond Model ◽  
Element Method

This document explores the possibility of the discrete element method (DEM) being applied in nonlinear dynamic analysis of space frame structures. The method models the analyzed object to be composed by finite particles and the Newton’s second law is applied to describe each particle’s motion. The parallel-bond model is adopted during the calculation of internal force and moment arising from the deformation. The procedure of analysis is vastly simple, accurate and versatile. Numerical examples are given to demonstrate the accuracy and applicability of this method in handling the large deflection and dynamic behaviour of space frame structures. Besides, the method does not need to form stiffness matrix or iterations, so it is more advantageous than traditional nonlinear finite element method.

Sign in / Sign up

Export Citation Format

Share Document