Lai C.CHuang A.NChen C.YHsu W.YSeville J.P.KHSIU-PO KUO2022-11-162022-11-16202200325910https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127138244&doi=10.1016%2fj.powtec.2022.117294&partnerID=40&md5=9f9c350de167005c78c7d2f37555995fhttps://scholars.lib.ntu.edu.tw/handle/123456789/625372The most common granular flow Discrete Element Method (DEM) simulation contact model is the spring-damping model, which typically uses constant restitution coefficients to estimate the model damping coefficient. The predicted rebound velocities are thus pre-determined by the ad hoc restitution coefficient setting. Considering the fact that the coefficient of restitution is contact velocity-dependent and event driven, we advance the spring-damping model using three contact velocity-dependent restitution coefficient approaches. We show that the spring-damping model using a new restitution coefficient approach derived from the model of Walton & Braun (1986) gives good rebound velocity predictions over a range of contact velocities for four spherical particles of different hardness. © 2022 Elsevier B.V.Contact duration; Contact force; DEM; Restitution coefficient; Spring-damping modelDamping; End effectors; Granular materials; Velocity; Contact duration; Contact forces; Contact modeling; Contact velocity; Discrete elements method; Rebound velocity; Restitution coefficient; Spherical particle; Spring-damping models; Velocity-dependent; Finite difference method; article; discrete element analysis; hardness; prediction; rebound; spring; velocityjournal article10.1016/j.powtec.2022.1172942-s2.0-85127138244