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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-362@lptms.universite-paris-saclay.fr
DTSTART:20150526T110000Z
DTEND:20150526T120000Z
DTSTAMP:20150514T130410Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-vicente-garzo/
SUMMARY:Séminaire du LPTMS: Vicente Garzo - LPTMS\, salle 201\, 2ème éta
 ge\, Bât 100\, Campus d'Orsay - 26 Mai 15 11:00
DESCRIPTION:Instabilities in granular fluids at moderate densities\nVicente
  Garzo\, Departamento de Fisica\, Universidad de Extremadura\nIt is well e
 stablished that when granular materials are externally excited (rapid flow
  conditions)\nthey behave like a fluid. In this regime\, binary collisions
  prevail and hence\, kinetic theory may\nbe considered as a quite useful t
 ool to describe the dynamics of grains. The main difference with\nrespect 
 to ordinary or molecular fluids is that granular systems are constituted b
 y macroscopic\ngrains that collide inelastically so that the energy decrea
 ses with time when the system evolves\nfreely (homogeneous cooling state\,
  HCS). One of the most characteristic features of granular fluids\,\nas co
 mpared with normal fluids\, is the spontaneous formation of velocity vorti
 ces and density clus-\nters in the HCS. These instabilities can be well de
 scribed through a linear stability analysis of the\nhydrodynamic equations
  and follow from the presence of a dissipation or sink term in the equatio
 n\nfor the balance of energy. Apart from its fundamental interest\, the de
 termination of the critical\nlength scale Lc for the onset of instabilitie
 s in freely cooling flows offers one of the best opportu-\nnities to asses
 s the theoretical predictions of granular hydrodynamics (which are based o
 n kinetic\ntheory calculations) when one compares those predictions with t
 hose independently obtained by\nmolecular dynamics (MD) simulations. In th
 is talk I will give some insight into the above problem\nby determining th
 e critical length scale L c for granular fluids at moderate densities. The
  comparison\nbetween kinetic theory and MD simulations shows in general an
  excellent agreement for the onset\nof velocity vortices\, indicating the 
 applicability of hydrodynamics to monodisperse and polydisperse\ngranular 
 flows even for strong inelasticity and finite density.
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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