Investigation of stresses in a Couette shear cell using Discrete Element Modeling

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dc.contributor.authorJareteg, Adam
dc.contributor.departmentChalmers tekniska högskola / Institutionen för tillämpad mekaniksv
dc.contributor.departmentChalmers University of Technology / Department of Applied Mechanicsen
dc.date.accessioned2019-07-03T13:32:48Z
dc.date.available2019-07-03T13:32:48Z
dc.date.issued2014
dc.description.abstractGranular flows are frequently seen in industry today but their complex nature makes it difficult to formulate general macroscopic governing relations. Effort has therefore been given to investigate these flows on detailed microscopic level and from that draw conclusions of the corresponding macroscopic behavior. In this project, a Discrete Element Modeling (DEM) method is used to simulate dry granular flow in a Couette geometry. The system is dense with particle volume fractions of up to α = 0:81. To accurately describe contact forces on the particles a soft-sphere model is used. Macroscopical system stresses are formulated based on the forces on each particle. Shear stresses are evaluated as a function of characteristic properties of the system, including volume fraction, the shear rate and particle friction. Clear trends on magnitude of the stresses are found for all considered properties. A higher volume fraction, shear rate or friction are shown to result in higher stress levels in the system. Further, tendencies on shear stress related to average normal stress are shown for volume fraction. Where a higher volume fraction results in a relatively lower shear stress. To investigate the presence of mono sized or of particles of different size in the system, a bimodal distribution of particle sizes is compared to a single size setup. For the distributed particle size calculations the stress magnitude coincide with the single size simulation, whereas the shear to normal stress ratios decrease faster in radial direction from the inner ring.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/205035
dc.language.isoeng
dc.relation.ispartofseriesDiploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden : 2014:63
dc.setspec.uppsokTechnology
dc.subjectGrundläggande vetenskaper
dc.subjectEnergi
dc.subjectStrömningsmekanik
dc.subjectHållbar utveckling
dc.subjectProduktion
dc.subjectBasic Sciences
dc.subjectEnergy
dc.subjectFluid mechanics
dc.subjectSustainable Development
dc.subjectProduction
dc.titleInvestigation of stresses in a Couette shear cell using Discrete Element Modeling
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeApplied mechanics (MPAME), MSc
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