Patrick RICHARD

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Patrick RICHARD
IFSTTAR
Site de Nantes
Université Nantes Angers Le Mans (LUNAM)
CS4
44344 Bouguenais cedex
France

Previous address:

Institut de Physique de Rennes
UMR CNRS 6251
Université Rennes 1
Université Européenne de Bretagne
Campus de Beaulieu Bat. 11A
263 av. Général Leclerc
35042 Rennes CEDEX
France

I study the physics and mechanics of granular media and other disordered materials. My main research subjects are granular flows and stability (and loss of stability) in granular media. I work in discrete media group of the Institut de Physique de Rennes.


News:

  • January 2013 The paper "Effect of confinement on dense packings of rigid frictionless spheres and polyhedra" has been published in Phys Rev E (Dec. 2012 volume). We studied numerically and model the effect of confining sidewalls on packings of frictionless grains.
    The paper can be downloaded here (Phys Rev E) or as a preprint here (arxiv)
  • December 2012 New affiliation! I am now working at the IFSTTAR which belongs to the LUNAM University (Université Nantes Angers Le Mans).
    Patrick RICHARD
    IFSTTAR
    Site de Nantes
    Université Nantes Angers Le Mans (LUNAM)
    CS4
    44344 Bouguenais cedex
    France
  • November 2012 A new paper, A model for the onset of oscillations near the stopping angle in an inclined granular flow written with Danielle Tan and Jim Jenkins, from Cornell University has been accepted for publication in The European Physical Journal E (EPJE): Eur. Phys. J. E (2012) 35: 122, DOI: 10.1140/epje/i2012-12122-x
    Click here to read the paper on epj.org.

  • November 2012 A nice picture (taken during the "nuit arts et sciences", Universite de Rennes 1 - oct. 11. 2012).

    The author of the picture is J. Le Bonheur (UR1/SPC).
  • October 2012 During the month of July, our article Statistical mechanics for static granular media: open questions was amongst the top ten accessed articles from the online version of Soft Matter. Click here for details.
  • October 2012 Thrusday, october, 11th, the discrete media team of the Institut de Physique de Rennes will hold a stand at the "nuit arts et sciences". Click here for details.
  • September 2012 The paper Statistical mechanics for static granular media: open questions has been published. It is available here (Soft Matter website) or directly here.
  • July 2012 A new article Statistical mechanics for static granular media: open questions, written in collaboration with B. Tighe, M. Schroeter and M. Pica Ciamarra, has been accepted for publication in Soft Matter. The paper is available here (Soft Matter)
  • June 2012 Our work on booming dunes (see the paper) is highlighted in the "Sciences Ouest" magazine (in french). Sciences Ouest #299 is available here and the highlight just below.
  • April 2012 Our work on booming dunes (see the paper) is highlighted here (web site of the Univeristy of Rennes 1 - in french)
  • February 2012 Visit the new website of the Institut de Physique de Rennes
  • January 2012 We studied "booming sand" by means of numerical simulations. Our result suggest that the grain surface properties are very important to the phenomenon of singing dunes, and supports the hypothesis that the grains must have an external layer of silica gel that is softer than the grain interior. This has been published in Phys. Rev. E: follow the link
  • December 2011 A new article Gravity driven shallow granular flows down flat frictional channels written with N. Brodu and R. Delannay is available on arxiv.
    Abstract : Granular flows down flat inclined channels are commonly used in the industry. In spite of their practical importance, they have not been investigated in details yet. Using DEM numerical simulations we find that stationary states occur for an unexpectedly large range of angles of inclination. We report previously unseen stationary regimes, with secondary rolls and with a supported dense slab on top of a granular gas. These are stabilized by the lateral boundaries at high angles.
  • September 2011 Want to see experiments on granular media ? Visit us at the "Fete de la Science" Esplanade du Général de Gaulle, Rennes (October 15-16, 2011 from 14:00 to 19:00).
  • June 2011 An article on our work is published in Science Ouest (in french)
  • December 2010 A new facility is available in our lab: a bucket elevator.
  • October 2010 The article Experimental evidence of ageing and slow restoration of the weak-contact configuration in tilted 3D granular packings has been accepted for publication in Journal of statistical mechanics. Follow this link to arxiv for the preprint version.
  • July 2010 The article Electrically induced tunable cohesion in granular systems has been accepted for publication in JOurnal of statistical mechanics. Follow this link to arxiv for the preprint version.
  • June 2010 The ANR project 2010 "STABINGRAM" has been accepted. Stabingram, for "STABility loss IN GRAnular Media" is a project funded by ANR (Agence Nationale de la Recherche) which aims at exploring the conditions for destabilization and reasons for stability in unconsolidated granular media by different means, including acoustics. The main partners are the FAST laboratory (Orsay), IPR (Rennes), Géosciences Rennes, and LAUM (Le Mans).