摘要
Ithaslongbeenrecognizedthattherotationofsingleparticlesplaysaveryimportantroleinsimulationsofgranularflowusingthediscreteelementmethod(DEM).ManyresearchershavealsopointedoutthattheeffectofrollingresistanceatthecontactpointsshouldbetakenintoaccountinDEMsimulations.However,evenforthesimplestcaseinvolvingtwo-dimensionalcircularparticles,thereisnoagreementonthebestwaytodefinerollingandsliding,anddifferentdefinitionsandcalculationsofrollingandslidinghavebeenproposed.Ithasevenbeensuggestedthatauniquerollingandslidingdefinitionisnotpossible.Inthispaperweassessresultsfrompreviousstudiesonrollingandslidingindiscreteelementmodelsandfindthatsomeresearchershaveoverlookedtheeffectofparticlesofdifferentsizes.Afterconsideringtheparticleradiusinthederivationofrollingvelocity,allresultsreachthesameoutcome:auniquesolution.Wealsopresentaclearandsimplederivationandvalidateourresultusingcasesofrolling.Suchadecompositionofrelativemotionisobjective,orindependentofthereferenceframeinwhichtherelativemotionismeasured.
出版日期
2015年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
