Volume 12
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Lommen, S., Schott, D., & Lodewijks, G. (2014). DEM speedup: Stiffness effects on behavior of bulk material. Particuology, 12, 107–112. https://doi.org/10.1016/j.partic.2013.03.006
DEM speedup: Stiffness effects on behavior of bulk material
Stef Lommen *, Dingena Schott, Gabriel Lodewijks
Department of Maritime and Transport Technology, Delft University of Technology, 2628CD Delft, The Netherlands
10.1016/j.partic.2013.03.006
Volume 12, February 2014, Pages 107-112
Received 21 December 2012, Revised 20 March 2013, Accepted 26 March 2013, Available online 9 July 2013.
E-mail: s.w.lommen@tudelft.nl

Highlights

• Three tests were modeled to study the effect of a particle stiffness reduction.

• One test showed an effect on bulk stiffness and bulk restitution.

• Two tests demonstrated that a speedup can be achieved without affecting results.


Abstract

A number of techniques exist for minimizing the computational cost of discrete element simulations (DEMs). One such method is a reduction of particle stiffness, which allows for bigger time steps and therefore fewer iterations in a simulation. However, the limits and drawbacks of this approach are still unclear, and may lead to invalid results. This paper investigates the effect of a stiffness reduction on bulk behavior by examining three case studies. Two cases demonstrate that particle stiffness can be reduced without affecting the bulk material behavior, whereas the third test shows that a stiffness reduction influences the bulk behavior.

Graphical abstract
Keywords

Discrete element method; Speedup; Stiffness reduction; Limit; Overlap