scholarly journals The developments of multi-level computational methodologies for discrete element modelling of granular materials

2019 ◽  
Author(s):  
Tingting Zhao
Keyword(s):  
Granular Materials ◽  
Discrete Element ◽  
Discrete Element Modelling ◽  
Element Modelling ◽  
Multi Level

scholarly journals A new time-delayed periodic boundary condition for discrete element modelling of railway track under moving wheel loads

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Huiqi Li ◽  
Glenn McDowell ◽  
John de Bono
Keyword(s):  
Boundary Condition ◽  
Periodic Boundary Condition ◽  
Periodic Boundary ◽  
Discrete Element ◽  
Contact Forces ◽  
Railway Track ◽  
Discrete Element Modelling ◽  
Fixed Boundary ◽  
Element Modelling ◽  
New Time

Abstract A new time-delayed periodic boundary condition (PBC) has been proposed for discrete element modelling (DEM) of periodic structures subject to moving loads such as railway track based on a box test which is normally used as an element testing model. The new proposed time-delayed PBC is approached by predicting forces acting on ghost particles with the consideration of different loading phases for adjacent sleepers whereas a normal PBC simply gives the ghost particles the same contact forces as the original particles. By comparing the sleeper in a single sleeper test with a fixed boundary, a normal periodic boundary and the newly proposed time-delayed PBC (TDPBC), the new TDPBC was found to produce the closest settlement to that of the middle sleeper in a three-sleeper test which was assumed to be free of boundary effects. It appears that the new TDPBC can eliminate the boundary effect more effectively than either a fixed boundary or a normal periodic cell. Graphic abstract

Discrete element modelling of track ballast capturing the true shape of ballast stones

2021 ◽  
Vol 386 ◽  
pp. 144-153
Author(s):  
Jacob Mortensen ◽  
Joachim Faldt Faurholt ◽  
Emil Hovad ◽  
Jens Honoré Walther
Keyword(s):  
Discrete Element ◽  
Discrete Element Modelling ◽  
Element Modelling ◽  
True Shape
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