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SUMMARY:MechE Colloquium: Some new directions in particle flow modeling
DTSTART:20191105T121500
DTEND:20191105T131500
DTSTAMP:20260430T201640Z
UID:66e3c27a6cf4e1518c486a369d2c294aafbe6172bb676743472595ec
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ken Kamrin\, Department of Mechanical Engineering\, Mass
 achusetts Institute of Technology (MIT)\nAbstract:\nThis talk discusses de
 velopments in continuum modeling and hybridized discrete-continuum modelin
 g for fluid-saturated and dry granular flows.  First we discuss a methodo
 logy for simulating "simple" continuum models for dry grains\, focusing on
  a recent frictional plasticity model and a meshfree simulation approach u
 sing the Material Point Method (MPM).This approach on its own is shown suf
 ficient to describe a number of granular intrusion problems.\n\nHowever\, 
 due to its simplicity such a model cannot always be trusted to capture gen
 eral flows accurately\, nor represent particle-scale phenomena such as clo
 gging\, bouncing\, and ballistic motion. To address this we propose a disc
 rete-continuum hybrid approach\, where an "oracle" algorithm dynamically p
 artitions the domain into continuum MPM regions\, where continuum modeling
  is safe\, and discrete element regions where necessary. The domains overl
 ap along transition zones\, where a Lagrangian dynamics mass-splitting cou
 pling principle enforces agreement between the two simulation states. Enri
 chment and homogenization operations allow the partitions to evolve over t
 ime. This approach accurately and efficiently simulates scenarios that pre
 viously required an entirely discrete treatment.\n\nFinally\, we discuss a
  technique for submerged granular flow problems\, which treats the granula
 r phase and the fluid phase as two separate\, yet coupled continuum models
 . Using mixture theory\, bouyancy and drag forces couple the Navier-Stokes
  behavior of the fluid phase to a dilatant\, rate-sensitive granular flow 
 model.  We run this mixture formulation using two coupled MPM simulations
 \, one for the fluid phase and one for the granular phase\, which solves f
 or all continuum variables in all phases.  This methodology is shown able
  to replicate experimental results for saturated granular flows over a ran
 ge of conditions and dilutions\, and can be extended to account for more o
 bscure effects\, such as those giving rise to shear-thickening suspensions
 .\n \nBio:\nKen Kamrin received a BS in Engineering Physics and a minor i
 n Mathematics at UC Berkeley in 2003\, and a PhD in Applied Mathematics at
  MIT in 2008.  Kamrin was an NSF Postdoctoral Research Fellow at Harvard 
 University in the School of Engineering and Applied Sciences before joinin
 g the Mechanical Engineering faculty at MIT in 2011\, where he was appoint
 ed the Class of 1956 Career Development Chair. Kamrin's research focuses o
 n constitutive modeling and computational mechanics for large deformation 
 processes\, with interests spanning elastic and plastic solid modeling\, v
 iscous and non-Newtonian flows\, amorphous solid mechanics\, upscaling and
  continuum homogenization\, and analytical methods for fluids and solids.
   Kamrin has been awarded fellowships from the Hertz foundation\, US Defe
 nse department\, and National Science Foundation.  Kamrin received the 20
 10 Nicholas Metropolis Award from APS for work in computational physics\, 
 the NSF CAREER Award in 2012\, the 2015 Eshelby Mechanics Award for Young 
 Faculty\, the Ruth and Joel Spira Teaching Award from the MIT School of En
 gineering in 2016\, and the 2016 ASME Journal of Applied Mechanics Award.
   He currently sits on the Board of Directors of the Society of Engineeri
 ng Science.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CONFIRMED
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