Discrete element simulations and constitutive modeling of dense granular flows

dc.contributor.advisor Shankar Subramaniam
dc.contributor.author Vidyapati, Vidyapati
dc.contributor.department Mechanical Engineering
dc.date 2018-08-11T07:42:10.000
dc.date.accessioned 2020-06-30T02:37:42Z
dc.date.available 2020-06-30T02:37:42Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2010
dc.date.embargo 2013-06-05
dc.date.issued 2010-01-01
dc.description.abstract <p>The aim of this study is to understand and explore the rheology of</p> <p>dense granular flow, in particular the phenomenon of regime</p> <p>transition, using both microscale DEM (discrete element method)</p> <p>simulations and macroscale modeling methods. The rheology of dense sheared granular flow in a Couette device is simulated using DEM. It is found that DEM simulations are capable of capturing the regime transition from quasi-static to intermediate behavior. A constitutive model based on the order parameter (OP) framework is refined, and a linear model with new model coefficients extracted from data of 3D DEM simulations of homogeneously sheared granular flows is proposed. The performance of different constitutive models including the refined OP model is tested in the intermediate regime of granular flows. None of these models captures the correct scaling of shear stress with shear rate in the intermediate regime, leading to the conclusion that further development of constitutive models is needed for dense granular flow in the intermediate regime.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/11723/
dc.identifier.articleid 2682
dc.identifier.contextkey 2807880
dc.identifier.doi https://doi.org/10.31274/etd-180810-1738
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/11723
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/25929
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/11723/Vidyapati_iastate_0097M_11539.pdf|||Fri Jan 14 18:56:57 UTC 2022
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Constitutive modeling
dc.subject.keywords Couette Cell
dc.subject.keywords Discrete element simulations
dc.subject.keywords Granular flows
dc.subject.keywords Order Parameter
dc.title Discrete element simulations and constitutive modeling of dense granular flows
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 6d38ab0f-8cc2-4ad3-90b1-67a60c5a6f59
thesis.degree.level thesis
thesis.degree.name Master of Science
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