iDEM: An impulse-based discrete element method for fast granular dynamics

• Published in: International journal for numerical methods in engineering Vol. 104; no. 2; pp. 79 - 103
• Main Authors: Lee, Seung Jae, Hashash, Youssef M.A.
• Format: Journal Article
• Language: English
• Published: Bognor Regis Blackwell Publishing Ltd 12.10.2015; Wiley Subscription Services, Inc
• Subjects: Accessibility; Algorithms; Computer simulation; Contact force; Discrete element method; discrete element method (DEM); Granular materials; Hardware; impulse-based discrete element method (iDEM); impulse-based dynamic simulation; Mathematical models; Numerical analysis; polyhedral particle modeling
• ISSN: 0029-5981; 1097-0207
• DOI: 10.1002/nme.4923

Summary Since the inception of discrete element method (DEM) over 30 years ago, significant algorithmic developments have been made to enhance the performance of DEM while emphasizing simulation fidelity. Nevertheless, DEM is still a computationally expensive numerical method for simulation of granular materials. In this study, a new impulse‐based DEM (iDEM) approach is introduced that uses collision impulse instead of contact force and directly handles velocity while bypassing integration of acceleration. Contact force required for engineering applications is retrieved with reasonable fidelity via an original proposed formulation. The method is robust, numerically stable and results in significant speed up of almost two orders of magnitude over conventional DEM. The proposed iDEM allows for the simulation of large number of particles within reasonable run times on readily accessible computer hardware. Copyright © 2015 John Wiley & Sons, Ltd.