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Patrick Richard

Senior research scientist (Directeur de Recherche) Head of the GPEM lab

Senior research scientist (Directeur de Recherche) Head of the GPEM lab

Activités de recherche

I study the physics and mechanics of granular media and other disordered materials from which fascinating emergent physical phenomena arise. Often, these complex phenomena are out-of-equilibrium and beyond their linear response regime.

Understanding their behavior often requires the development of new experimental techniques, analysis tools, numercial simulations and theoretical models.

My main research subjects are granular packings, granular miing and mictures, crushing, granular flows and optimization of processes involving granular materials.

You can also visit the web pages of the GPEM lab

Research activity

I study the physics and mechanics of granular media and other disordered materials from which fascinating emergent physical phenomena arise. Often, these complex phenomena are out-of-equilibrium and beyond their linear response regime.

Understanding their behavior often requires the development of new experimental techniques, analysis tools, numercial simulations and theoretical models.

My main research subjects are granular packings, granular miing and mictures, crushing, granular flows and optimization of processes involving granular materials.

You can also visit the web pages of the GPEM lab

Mes dernières références

My latest references

Publication list

Publication list

  1. Patrick RICHARD, Riccardo ARTONI, Alexandre VALANCE and Renaud DELANNAY, Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows, Granular Matter, 2020, 22, 81
  2. Diego Berzi, Jim Jenkins and Patrick Richard, Extended kinetic theory for granular flow over and within an inclined erodible bed, Journal of Fluids Mechanics, 2020, 885, A27 
  3. Diego Berzi, Jim Jenkins and Patrick Richard, Erodible, granular beds are fragile, Soft Matter, 2019,15, 7173-7178
  4. Riccardo Artoni, Giovanni Loro, Patrick Richard, Fabio Gabrieli and Andrea C. Santomaso, Drag in wet granular materials, Powder Technology, 356, 231-239 (2019)
  5. Riccardo Artoni and Patrick Richard, Coarse graining for granular materials: micro-polar balances, Acta mechanica, 230, 3055-3069 (2019) 
  6. Yannick Descantes, Fabien Tricoire, Patrick Richard, Classical contact detection algorithms for 3D DEM simulations: Drawbacks and solutions, Computers and Geotechnics, 114, 103134, (2019)  doi: 10.1016/j.compgeo.2019.103134.
  7. Timur Borykov, Daniel Mège, Anne Mangeney, Patrick Richard, Joanna Gurgurewicz and Antoine Lucas, Empirical investigation of friction weakening of terrestrial and Martian landslides using discrete element models, Landslides, 16, 1121-1140, (2019) 
  8. Riccardo Artoni, Aurélien Neveu, Yannick Descantes and Patrick Richard, Effect of contact location on the crushing strength of aggregates, Journal of the Mechanics and Physics of Solids, 122, 406-417, (2019) 
  9. Auriane Platzer, Salman Rouhanifar, Patrick Richard, Bogdan Cazacliu and Erdin Ibraim, Sand–rubber mixtures undergoing isotropic loading: derivation and experimental probing of a physical model, Granular Matter 20: 81 (2018) https://doi.org/10.1007/s10035-018-0853-7 
  10. Riccardo Artoni, Alberto Soligo, Jean-Marc Paul and Patrick Richard, Shear localization and wall friction in confined dense granular flows, Journal of Fluid Mechanics, 849, 395-418 (2018) .
  11. Houda Maimouni, Sébastien Remond, Florian Huchet, Patrick Richard, Vincent Thiery and Yannick Descantes, Quantitative assessment of the saturation degree of model fine recycled concrete aggregates immersed in a filler or cement paste, Construction and Building Materials, 175, 496-507 (2018) 
  12. Riccardo Artoni and Patrick Richard, Torsional shear flow of granular materials: shear localization and minimum energy principle, Computational Particle Mechanics, 5(1), 3-12 (2018) 
  13. Florian Huchet, Laurédan Le Guen, Patrick Richard, Maxime Piton, Bodgan Cazacliu, Philppe Semelle, Jérôme Matheus, Hervé Riché & Philippe Tamagny, Influence of asphalt composition upon the thermodynamics performance of a mixing plant, Road and Pavement Material Design,19, 104-119 (2018)
  14. Renaud Delannay, Alexandre Valance, Anne Mangeney, Olivier Roche. and Patrick Richard, Granular and particle-laden flows: from laboratory experiments to field observations, Journal of Physics D-Applied Physics, 50, 053001 (2017) 
  15. Laurédan Le Guen, Maxime Piton, Quentin Hénaut, Florian Huchet and Patrick Richard, Heat Convection and Radiation in Flighted Rotary Kilns: A Minimal Model, The Canadian Journal of Chemical engineering, 95, 100-110, (2017)
  16. Aurélien Neveu, Riccardo Artoni, Patrick Richard and Yannick Descantes, Fracture of granular materials composed of arbitrary grain shapes: A new cohesive interaction model, Journal of the Mechanics and Physics of Solids, 95, 308-319, (2016)
  17. Riccardo Artoni and Patrick Richard, Effective wall friction in wall-bounded 3D dense granular flows, Phys. Rev. Lett. 115, 158001 (2015)
  18. Nicolas Brodu, Renaud Delannay, Alexandre Valance and Patrick Richard, New patterns in high-speed granular flows, Journal of Fluid Mechanics, 769, 218- 228, (2015) 
  19. Riccardo Artoni and Patrick Richard, Average balance equations, scale dependence, and energy cascade for granular materials, Phys. Rev. E 91, 032202 (2015) 
  20. Dalila Vescovi, Diego Berzi, Patrick Richard and Nicolas Brodu, kinetic theory and 3D Soft-Sphere Discrete Element Method simulations, Phys. Fluids 26, 053305 (2014) 
  21. Vladimir Y. Zaitsev, Vitalyi E. Gusev, Vincent Tournat, and Patrick Richard, Slow Relaxation and Aging Phenomena at the Nanoscale in Granular Materials, Phys. Rev. Lett. 112, 108302 (2014) 
  22. Merline Tankeo, Patrick Richard and Edouard Canot, Analytical solution of the µ(I)-rheology for fully developed granular flows in simple configurations, Granular Matter, 15, p 881-891, (2013), 
  23. Nicolas Brodu, Patrick Richard and Renaud Delannay, Shallow granular flows down flat frictional channels: Steady flows and longitudinal vortices, Physical Review E 87, 022202 (2013) 
  24. Jean-François Camenen, Yannick Descantes and Patrick Richard, Effect of confinement on dense packings of rigid frictionless spheres and polyhedra, Physical Review E, 86, 061317 (2012)
  25. Danielle Tan, Patrick Richard, James T. Jenkins, A model for the onset of oscillations near the stopping angle in an inclined granular flow, Eur. Phys. J. E (2012) 35: 122
  26. Massimo Pica Ciamarra , Patrick Richard , Matthias Schröter and Brian P. Tighe, Statistical mechanics for static granular media: open questions, Soft Matter 2012,8, 9731-9737
  27. Patrick Richard, Sean McNamara and Merline Tankeo, Relevance of numerical simulations to booming sand, Phys. Rev. E, 85, 010301 (2012)
  28. Sébastien Kiesgen de Richter Vladimir Yu Zaitsev, Patrick Richard, Renaud Delannay, Gérard Le Caer and Vincent Tournat, Experimental evidence of aging and slow restoration of the weak-contact configuration in tilted 3D granular packings, Journal of statistical mechanics, P11023 (2010).
  29. Jean-Francois Metayer, Patrick Richard, Alain Faisant and Renaud Delannay, Electrically induced tunable cohesion in granular systems, Journal of statistical mechanics, P08003 (2010).
  30. Gaelle Recher, Denis Rouede, Patrick Richard, Antoine Simon, Jean-Jaques Bellanger, Francois Tiaho, Three distinct sarcomeric patterns of skeletal muscle revealed by SHG and TPEF Microscopy, Optics Express, Vol. 17, Issue 22, pp. 19763-19777 (2009). 
  31. Sean McNamara, Patrick Richard, Sebastien Kiesgen de Richter, Gerard Le Caer, and Renaud Delannay, "Measurement of granular entropy", Phys. Rev. E 80, 031301 (2009).
  32. Patrick Richard, Alexandre Valance, Jean-François Metayer, Paul Sanchez, Jérôme Crassous, Michel Y. Louge and Renaud Delannay, "Rheology of confined granular flows: Scale invariance, glass transition and friction weakening", Physical Review Letters, 101, 248002 (2008). 
  33. Vladimir Yu. Zaitsev, Patrick Richard, Renaud Delannay, Vincent Tournat and Vitalyi E. Gusev, "Pre-avalanche structural rearrangements in the bulk of granular medium: experimental evidence, Europhysics Letters, 83, 64003, (2008) DOI: 10.1209/0295-5075/83/64003. 
  34. Patrick Richard and Nicolas Taberlet, "Recent advances in D.E.M. simulations of grains in a rotating drum", Soft Matter, 2008, 4, 1345-1348 (2008) DOI: 10.1039/b717129c. 
  35. Jérôme Crassous, Jean-François Metayer, Patrick Richard and Claude Laroche, "Experimental study of a creeping granular flow at very low velocity", Journal of Statistical Mechanics: Theory and experiment, P03009 (2008). 
  36. N. Taberlet, P. Richard and R. Delannay, "The effect of sidewall friction on dense granular flows", Computers & Mathematics with Applications, 55, 230-234 (2008).
  37. Ph. Ribière, P. Richard, P. Philippe, D. Bideau and R. Delannay , "On the existence of stationary states during granular compaction", The European Physical Journal E, 22, 249-253 (2007). 
  38. N. Taberlet, P. Richard, J.T. Jenkins and R. Delannay, "Density inversion in rapid granular flows: the supported regime", The European Physical Journal E, 22, 17-24 (2007). 
  39. R. Delannay, M. Louge, P. Richard, N. Taberlet and A. Valance, " Towards a theoretical picture of dense granular flows down inclines", Nature Materials 6, 99–108 (2007). 
  40. W. Bi, R. Delannay, P. Richard, et A. Valance, "Experimental study of two-dimensional, monodisperse, frictional-collisional granular flows down an inclined chute", Physics of Fluids 18, 123302 (2006), 
  41. N. Taberlet, P. Richard and E.J. Hinch, " The S-shape of a granular pile in a rotating drum", Phys. Rev. E 73, 050301 (2006), 
  42. Nicolas Taberlet, Michael Newey, Patrick Richard and Wolfgang Losert, Axial segregation in tumbler flows: experimental and numerical studies, J. Stat. Mech. (2006) P07013. abstract&download (JStatMech ) BIBTEX File
  43. N. Taberlet and P. Richard, "Diffusion of a granular pulse in a rotating drum", Physical Review E 73(4) 041301 (2006). 
  44. P. Ribière, P. Richard, R. Delannay, D. Bideau, M. Toiya and W. Losert, "Effect of Rare Events on Out-of-Equilibrium Relaxation", Physical Review Letters 95, 268001 (2005). 
  45. P. Ribière, P. Philippe, P. Richard, R. Delannay and D. Bideau, "Slow compaction of granular systems", Journal of Physics Condensed Matter, 17, S2743-S2754 (2005).
  46. W. Bi, R. Delannay, P. Richard, N. Taberlet and A. Valance, "Two- and three-dimensional confined granular chute flows: experimental and numerical results", Journal of Physics Condensed Matter, 17, S2457-S2480 (2005). 
  47. P. Richard, M. Nicodemi, R. Delannay, P. Ribière et D. Bideau, "Slow relaxation and compaction of granular systems", Nature Materials, 4, 121-128 (2005)
  48. P. Ribière, P. Richard, D. Bideau and R. Delannay, "Experimental compaction of anisotropic granular media ", The European Physical Journal E, 16, 415-420 (2005) 
  49. P. Ribière, P. Richard, R. Delannay and D. Bideau, "Importance of convection in the compaction mechanisms of anisotropic granular media ", Physical Review E 71, 011304 (2005). 
  50. N. Taberlet, P. Richard, E. Henry and R. Delannay, "The growth of a Super Stable Heap: An experimental and numerical study", Europhysics Letters, 68 (4), pages 515-521 (2004) 
  51. N. Taberlet, W. Losert and P. Richard, "Understanding the dynamics of segregation bands of simulated granular material in a rotating drum ", Europhysics Letters, 68 (4), pages 522-528 (2004) 
  52. GDR MiDi, "On dense granular flows", The European Physical Journal E 14 , pages 341-365 (2004) 
  53. N. Taberlet, P. Richard, A. Valance, W. Losert, J.-M. Pasini, J. T. Jenkins and R. Delannay, "Superstable Granular Heap in a Thin Channel", Phys. Rev. Lett. 91, pages 264301 (2003). 
  54. G. Berton, R. Delannay, P. Richard, N. Taberlet and A. Valance, 2D inclined chute flows : transverse motion and segregation, Physical Review E, 68, pages 051303 (2003) 
  55. Patrick Richard, Pierre Philippe, Fabrice Barbe, Stéphane Bourlès, Xavier Thibault and Daniel Bideau, Analysis by X-ray microtomography of a granular packing undergoing compaction, Phys. Rev E 68, 020301 (2003). 
  56. P. Richard, T. Prasse, J.Y. Cavaillé, L. Chazeau, C. Gauthier and J. Duchet, "Reinforcement of rubbery epoxy by carbon nanofibres", Materials Science and Engineering: A 352, 344-348 (2003) 
  57. V. Luchnikov, A. Gervois, P. Richard, L. Oger and J.-P. Troadec, Cristallization of dense hard sphere packings : competition of fcc and hcp close order, Journal of Molecular Liquids, 96-97, 185-194, (2002). 
  58. P. Richard, J-P. Troadec, L. Oger and A. Gervois, A model of binary assemblies of spheres, The European Physical Journal E, 6 , pages 295-303, (2001). 
  59. P. Richard, J-P. Troadec, L. Oger and A. Gervois, Effect of the anisotropy of the cells on the topological properties of 2D and 3D froths , Physical Review E, 63, 062401 (2001). 
  60. L. Oger, P. Richard, J-P. Troadec and A. Gervois, Comparison of two representations of a random cut of identical sphere packing, The European Physical Journal B, 14, pages 403-406, (2000). 
  61. P. Richard, A. Gervois, L. Oger and J.-P. Troadec, Order and disorder in hard sphere packings, Europhysics Letters, 48 (4), pages 415-420, (1999). 
  62. P. Richard, L. Oger, J-P. Troadec and A. Gervois, Geometrical characterization of hard sphere systems, Physical Review E, 60(4), pages 4551-4558, (1999).
  63. P. Richard, L.Oger, L. Samson, J. Lemaître and N.N. Medvedev, Application of the Voronoi tessellation to study transport and segregation of grains inside 2D and 3D packings of spheres, Granular Matter , 1, pages 203-211, (1999).
  64. P. Richard, L. Oger, J.P. Troadec and A. Gervois, Tessellation of binary assemblies of spheres, Physica A, 259, pages 205-221, (1998). 

<ol><li>Diego Berzi, Jim Jenkins and Patrick Richard, Extended kinetic theory for granular flow over and within an inclined erodible bed, Journal of Fluids Mechanics, 2020, 885, A27 </li><li>Diego Berzi, Jim Jenkins and Patrick Richard, Erodible, granular beds are fragile, Soft Matter, 2019,15, 7173-7178 </li><li>Riccardo Artoni, Giovanni Loro, Patrick Richard, Fabio Gabrieli and Andrea C. Santomaso, Drag in wet granular materials, Powder Technology, 356, 231-239 (2019) </li><li>Riccardo Artoni and Patrick Richard, Coarse graining for granular materials: micro-polar balances, Acta mechanica, 230, 3055-3069 (2019) </li><li>Yannick Descantes, Fabien Tricoire, Patrick Richard, Classical contact detection algorithms for 3D DEM simulations: Drawbacks and solutions, Computers and Geotechnics, 114, 103134, (2019) doi: 10.1016/j.compgeo.2019.103134. </li><li>Timur Borykov, Daniel Mège, Anne Mangeney, Patrick Richard, Joanna Gurgurewicz and Antoine Lucas, Empirical investigation of friction weakening of terrestrial and Martian landslides using discrete element models, Landslides, 16, 1121-1140, (2019) </li><li>Riccardo Artoni, Aurélien Neveu, Yannick Descantes and Patrick Richard, Effect of contact location on the crushing strength of aggregates, Journal of the Mechanics and Physics of Solids, 122, 406-417, (2019) </li><li>Auriane Platzer, Salman Rouhanifar, Patrick Richard, Bogdan Cazacliu and Erdin Ibraim, Sand–rubber mixtures undergoing isotropic loading: derivation and experimental probing of a physical model, Granular Matter 20: 81 (2018) https://doi.org/10.1007/s10035-018-0853-7 </li><li>Riccardo Artoni, Alberto Soligo, Jean-Marc Paul and Patrick Richard, Shear localization and wall friction in confined dense granular flows, Journal of Fluid Mechanics, 849, 395-418 (2018) . </li><li>Houda Maimouni, Sébastien Remond, Florian Huchet, Patrick Richard, Vincent Thiery and Yannick Descantes, Quantitative assessment of the saturation degree of model fine recycled concrete aggregates immersed in a filler or cement paste, Construction and Building Materials, 175, 496-507 (2018) </li><li>Riccardo Artoni and Patrick Richard, Torsional shear flow of granular materials: shear localization and minimum energy principle, Computational Particle Mechanics, 5(1), 3-12 (2018) </li><li>Florian Huchet, Laurédan Le Guen, Patrick Richard, Maxime Piton, Bodgan Cazacliu, Philppe Semelle, Jérôme Matheus, Hervé Riché &amp; Philippe Tamagny, Influence of asphalt composition upon the thermodynamics performance of a mixing plant, Road and Pavement Material Design,19, 104-119 (2018) </li><li>Renaud Delannay, Alexandre Valance, Anne Mangeney, Olivier Roche. and Patrick Richard, Granular and particle-laden flows: from laboratory experiments to field observations, Journal of Physics D-Applied Physics, 50, 053001 (2017) </li><li>Laurédan Le Guen, Maxime Piton, Quentin Hénaut, Florian Huchet and Patrick Richard, Heat Convection and Radiation in Flighted Rotary Kilns: A Minimal Model, The Canadian Journal of Chemical engineering, 95, 100-110, (2017) </li><li>Aurélien Neveu, Riccardo Artoni, Patrick Richard and Yannick Descantes, Fracture of granular materials composed of arbitrary grain shapes: A new cohesive interaction model, Journal of the Mechanics and Physics of Solids, 95, 308-319, (2016) </li><li>Riccardo Artoni and Patrick Richard, Effective wall friction in wall-bounded 3D dense granular flows, Phys. Rev. Lett. 115, 158001 (2015) </li><li>Nicolas Brodu, Renaud Delannay, Alexandre Valance and Patrick Richard, New patterns in high-speed granular flows, Journal of Fluid Mechanics, 769, 218- 228, (2015) </li><li>Riccardo Artoni and Patrick Richard, Average balance equations, scale dependence, and energy cascade for granular materials, Phys. Rev. E 91, 032202 (2015) </li><li>Dalila Vescovi, Diego Berzi, Patrick Richard and Nicolas Brodu, kinetic theory and 3D Soft-Sphere Discrete Element Method simulations, Phys. Fluids 26, 053305 (2014) </li><li>Vladimir Y. Zaitsev, Vitalyi E. Gusev, Vincent Tournat, and Patrick Richard, Slow Relaxation and Aging Phenomena at the Nanoscale in Granular Materials, Phys. Rev. Lett. 112, 108302 (2014) </li><li>Merline Tankeo, Patrick Richard and Edouard Canot, Analytical solution of the µ(I)-rheology for fully developed granular flows in simple configurations, Granular Matter, 15, p 881-891, (2013), </li><li>Nicolas Brodu, Patrick Richard and Renaud Delannay, Shallow granular flows down flat frictional channels: Steady flows and longitudinal vortices, Physical Review E 87, 022202 (2013) </li><li>Jean-François Camenen, Yannick Descantes and Patrick Richard, Effect of confinement on dense packings of rigid frictionless spheres and polyhedra, Physical Review E, 86, 061317 (2012) </li><li>Danielle Tan, Patrick Richard, James T. Jenkins, A model for the onset of oscillations near the stopping angle in an inclined granular flow, Eur. Phys. J. E (2012) 35: 122 </li><li>Massimo Pica Ciamarra , Patrick Richard , Matthias Schröter and Brian P. Tighe, Statistical mechanics for static granular media: open questions, Soft Matter 2012,8, 9731-9737 </li><li>Patrick Richard, Sean McNamara and Merline Tankeo, Relevance of numerical simulations to booming sand, Phys. Rev. E, 85, 010301 (2012) </li><li>Sébastien Kiesgen de Richter Vladimir Yu Zaitsev, Patrick Richard, Renaud Delannay, Gérard Le Caer and Vincent Tournat, Experimental evidence of aging and slow restoration of the weak-contact configuration in tilted 3D granular packings, Journal of statistical mechanics, P11023 (2010). </li><li>Jean-Francois Metayer, Patrick Richard, Alain Faisant and Renaud Delannay, Electrically induced tunable cohesion in granular systems, Journal of statistical mechanics, P08003 (2010). </li><li>Gaelle Recher, Denis Rouede, Patrick Richard, Antoine Simon, Jean-Jaques Bellanger, Francois Tiaho, Three distinct sarcomeric patterns of skeletal muscle revealed by SHG and TPEF Microscopy, Optics Express, Vol. 17, Issue 22, pp. 19763-19777 (2009). </li><li>Sean McNamara, Patrick Richard, Sebastien Kiesgen de Richter, Gerard Le Caer, and Renaud Delannay, "Measurement of granular entropy", Phys. Rev. E 80, 031301 (2009). </li><li>Patrick Richard, Alexandre Valance, Jean-François Metayer, Paul Sanchez, Jérôme Crassous, Michel Y. Louge and Renaud Delannay, "Rheology of confined granular flows: Scale invariance, glass transition and friction weakening", Physical Review Letters, 101, 248002 (2008). </li><li>Vladimir Yu. Zaitsev, Patrick Richard, Renaud Delannay, Vincent Tournat and Vitalyi E. Gusev, "Pre-avalanche structural rearrangements in the bulk of granular medium: experimental evidence, Europhysics Letters, 83, 64003, (2008) DOI: 10.1209/0295-5075/83/64003. </li><li>Patrick Richard and Nicolas Taberlet, "Recent advances in D.E.M. simulations of grains in a rotating drum", Soft Matter, 2008, 4, 1345-1348 (2008) DOI: 10.1039/b717129c. </li><li>Jérôme Crassous, Jean-François Metayer, Patrick Richard and Claude Laroche, "Experimental study of a creeping granular flow at very low velocity", Journal of Statistical Mechanics: Theory and experiment, P03009 (2008). </li><li>N. Taberlet, P. Richard and R. Delannay, "The effect of sidewall friction on dense granular flows", Computers &amp; Mathematics with Applications, 55, 230-234 (2008). </li><li>Ph. Ribière, P. Richard, P. Philippe, D. Bideau and R. Delannay , "On the existence of stationary states during granular compaction", The European Physical Journal E, 22, 249-253 (2007). </li><li>N. Taberlet, P. Richard, J.T. Jenkins and R. Delannay, "Density inversion in rapid granular flows: the supported regime", The European Physical Journal E, 22, 17-24 (2007). </li><li>R. Delannay, M. Louge, P. Richard, N. Taberlet and A. Valance, " Towards a theoretical picture of dense granular flows down inclines", Nature Materials 6, 99–108 (2007). </li><li>W. Bi, R. Delannay, P. Richard, et A. Valance, "Experimental study of two-dimensional, monodisperse, frictional-collisional granular flows down an inclined chute", Physics of Fluids 18, 123302 (2006), </li><li>N. Taberlet, P. Richard and E.J. Hinch, " The S-shape of a granular pile in a rotating drum", Phys. Rev. E 73, 050301 (2006), </li><li>Nicolas Taberlet, Michael Newey, Patrick Richard and Wolfgang Losert, Axial segregation in tumbler flows: experimental and numerical studies, J. Stat. Mech. (2006) P07013. abstract&amp;download (JStatMech ) BIBTEX File </li><li>N. Taberlet and P. Richard, "Diffusion of a granular pulse in a rotating drum", Physical Review E 73(4) 041301 (2006). </li><li>P. Ribière, P. Richard, R. Delannay, D. Bideau, M. Toiya and W. Losert, "Effect of Rare Events on Out-of-Equilibrium Relaxation", Physical Review Letters 95, 268001 (2005). </li><li>P. Ribière, P. Philippe, P. Richard, R. Delannay and D. Bideau, "Slow compaction of granular systems", Journal of Physics Condensed Matter, 17, S2743-S2754 (2005). </li><li>W. Bi, R. Delannay, P. Richard, N. Taberlet and A. Valance, "Two- and three-dimensional confined granular chute flows: experimental and numerical results", Journal of Physics Condensed Matter, 17, S2457-S2480 (2005). </li><li>P. Richard, M. Nicodemi, R. Delannay, P. Ribière et D. Bideau, "Slow relaxation and compaction of granular systems", Nature Materials, 4, 121-128 (2005) </li><li>P. Ribière, P. Richard, D. Bideau and R. Delannay, "Experimental compaction of anisotropic granular media ", The European Physical Journal E, 16, 415-420 (2005) </li><li>P. Ribière, P. Richard, R. Delannay and D. Bideau, "Importance of convection in the compaction mechanisms of anisotropic granular media ", Physical Review E 71, 011304 (2005). </li><li>N. Taberlet, P. Richard, E. Henry and R. Delannay, "The growth of a Super Stable Heap: An experimental and numerical study", Europhysics Letters, 68 (4), pages 515-521 (2004) </li><li>N. Taberlet, W. Losert and P. Richard, "Understanding the dynamics of segregation bands of simulated granular material in a rotating drum ", Europhysics Letters, 68 (4), pages 522-528 (2004) </li><li>GDR MiDi, "On dense granular flows", The European Physical Journal E 14 , pages 341-365 (2004) </li><li>N. Taberlet, P. Richard, A. Valance, W. Losert, J.-M. Pasini, J. T. Jenkins and R. Delannay, "Superstable Granular Heap in a Thin Channel", Phys. Rev. Lett. 91, pages 264301 (2003). </li><li>G. Berton, R. Delannay, P. Richard, N. Taberlet and A. Valance, 2D inclined chute flows : transverse motion and segregation, Physical Review E, 68, pages 051303 (2003) </li><li>Patrick Richard, Pierre Philippe, Fabrice Barbe, Stéphane Bourlès, Xavier Thibault and Daniel Bideau, Analysis by X-ray microtomography of a granular packing undergoing compaction, Phys. Rev E 68, 020301 (2003). </li><li>P. Richard, T. Prasse, J.Y. Cavaillé, L. Chazeau, C. Gauthier and J. Duchet, "Reinforcement of rubbery epoxy by carbon nanofibres", Materials Science and Engineering: A 352, 344-348 (2003) </li><li>V. Luchnikov, A. Gervois, P. Richard, L. Oger and J.-P. Troadec, Cristallization of dense hard sphere packings : competition of fcc and hcp close order, Journal of Molecular Liquids, 96-97, 185-194, (2002). </li><li>P. Richard, J-P. Troadec, L. Oger and A. Gervois, A model of binary assemblies of spheres, The European Physical Journal E, 6 , pages 295-303, (2001). </li><li>P. Richard, J-P. Troadec, L. Oger and A. Gervois, Effect of the anisotropy of the cells on the topological properties of 2D and 3D froths , Physical Review E, 63, 062401 (2001). </li><li>L. Oger, P. Richard, J-P. Troadec and A. Gervois, Comparison of two representations of a random cut of identical sphere packing, The European Physical Journal B, 14, pages 403-406, (2000). </li><li>P. Richard, A. Gervois, L. Oger and J.-P. Troadec, Order and disorder in hard sphere packings, Europhysics Letters, 48 (4), pages 415-420, (1999). </li><li>P. Richard, L. Oger, J-P. Troadec and A. Gervois, Geometrical characterization of hard sphere systems, Physical Review E, 60(4), pages 4551-4558, (1999). </li><li>P. Richard, L.Oger, L. Samson, J. Lemaître and N.N. Medvedev, Application of the Voronoi tessellation to study transport and segregation of grains inside 2D and 3D packings of spheres, Granular Matter , 1, pages 203-211, (1999). </li><li>P. Richard, L. Oger, J.P. Troadec and A. Gervois, Tessellation of binary assemblies of spheres, Physica A, 259, pages 205-221, (1998).&nbsp;</li></ol>