Stefan Luding

For this session, a review over some research on segregation in the past 20 years, including segregation in chute flows or vibrated granular systems will be given, with focus on some of the traditional, long-standing questions:
– what are the different mechanisms causing segregation? [1,2]
– what causes hydrodynamic/convective flows that can influence segregation? [7,8].
– what segregation mechanisms are specific to vibrated granular media? [2,5], and
what are the important/dominating control parameters [7,8] of vibrated granular systems?
– is it possible to describe discrete granular particle systems, including segregation by continuum methods?
Phenomena like convection [2,8], particle-size driven geometric segregation [1], thermal fluctuations [3], shear- or temperature-gradients [4], condensation [5], or detachment [7],
will be discussed and an outlook for a hydrodynamic description of vibrated systems [8] will be given. The review will end with a brief overview of the session.
[1] Sabine Dippel and S. Luding
Simulations on size segregation: Geometrical effects in the absence of convection
J. Phys. I France, 5:1527, 1995.
[2] S. Luding, J. Duran, E. Cl’ement, and J. Rajchenbach
Segregation of Particulate Solids: Segregation via Convection
Pharmaceutical Technology, August 1996; S. Luding, E. Cl’ement, A. Blumen, J. Rajchenbach, and J. Duran
Onset of convection in molecular dynamics simulations of grains
[ Phys. Rev. E, 50:R1762, 1994 ]; Y h. Taguchi, New origin of a convective motion: Elastically induced convection in granular materials, [ Phys. Rev. Lett. 69, 1367 (1992) ].
[3] S. McNamara and S. Luding, 
A simple method to mix granular materials
in: Segregation in Granular Flows, IUTAM symposium, A. D. Rosato and D. L. Blackmore (eds.), Kluwer Academic Publishers, 2000, pp. 305-310 [cond-mat 9910084 ]; S. McNamara and S. Luding, 
Energy flows in vibrating granular media,
[ Phys. Rev. E 58, 813-822, 1998 ].
[4] S. Luding, O. Strauss, and S. McNamara, 
Segregation of polydisperse granular media in the presence of a temperature gradient
in: Segregation in Granular Flows, IUTAM symposium, A. D. Rosato and D. L. Blackmore (eds.), Kluwer Academic Publishers, 2000, pp. 297-303 [cond-mat 9910085 ].
[5] Daniel C. Hong, Paul V. Quinn, S. Luding, 
The Reverse Brazil Nut Problem: Compe-tition between Percolation and Condensation 
Phys. Rev. Lett., 86, 3423-3426, 2001
[6] A. R. Thornton, T. Weinhart, S. Luding, and O. Bokhove, 
Modeling of particle size segregation: Calibration using the discrete particle method, 
[ Int. J. Mod. Phys. C 23(8), 1240014, 2012 ].
[7] S. Luding, E. Clement, A. Blumen, J. Rajchenbach, and J. Duran
Anomalous energy dissipation in molecular dynamics simulations of grains [ Phys. Rev. E, 50:4113, 1994 ]
[8] P. Eshuis, K. van der Weele, M. Alam, H. J. van Gerner, M. van der Hoef, H. Kuipers, S. Luding, D. van der Meer, D. Lohse, 
Buoyancy driven convection in vertically shaken granular matter: experiment, numerics, and theory, 
[ Granular Matter 15(6), 893-911, 2013 ].

Brief Biography
Stefan Luding studied physics at Bayreuth, Germany (reactions on complex and fractal geometries). He did his PhD on the simulations of dry granular materials in the group of Prof. A. Blumen in Freiburg, Germany and spent his post-doctorate time in Paris IV, Jussieu, with E. Clement and J. Duran, before he joined the Computational Physics group in Stuttgart, Germny, with Prof. Herrmann in 1995, where he achieved his habilitation in 1998.
In 2001, he moved to DelftChemTech at the TU Delft, Netherlands, as Assoc. Prof. Particle Technology. Since 2007 he chairs the group Multiscale Mechanics (MSM) at the Faculty of Engineering Technology and MESA+ at the University of Twente, Netherlands.
His major research expertise is on granular matter, non-Newtonian flow rheology, non-linear solids, particle interactions, cohesive powders, asphalt, composites, bio-/micro-fluid systems, self-healing materials and most of all on micro-macro transition methods.
Among many other tasks and services for the community, he is since 1998 Managing Editor in Chief of the journal Granular Matter as well as, since 2005, president of AEMMG organizing the Powders and Grains conference series with the next event taking place in Buenos Aires, Argentina, July, 2021.