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SUMMARY:The granular silo as a visco-plastic flow (or why sandglasses do n
 ot flow like water-clocks) - Lydie Staron (CNRS/Bristol)
DTSTART:20130301T160000Z
DTEND:20130301T170000Z
UID:TALK42526@talks.cam.ac.uk
CONTACT:Dr Ed Brambley
DESCRIPTION:Granular matter is well-known for its ability to flow like a v
 iscous fluid or resist shear like a solid\, evolving from one state to the
  other over a few grain diameters. These complex flow properties are perha
 ps best illustrated during the discharge of a silo\, where rapid motion\, 
 slow shear and static equilibrium co-exist at all times. This makes the si
 lo configuration  a stringent test for continuum  modeling of granular mat
 ter.\n\nImplementing a plastic rheology in a 2D Navier-Stokes solver\, we 
 simulate the continuum counterpart of the granular silo. Doing so\, we obt
 ain a behavior in agreement with experimental observation.  Focussing on t
 he role of the plastic yield stress in the flow characteristics\, we discu
 ss the difference between the discharge of granular matter (as in a sandgl
 ass) and of a viscous fluid (as in a clepsydra). The strengths and limitat
 ions of the plastic rheology implemented (the "mu(I)" flow-law) are then d
 iscussed in the light of discrete element simulations.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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