Luding, S. (S.)

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    On the use of Graphics Processing Units (GPUs) for molecular dynamics simulation of spherical particles
    (AIP Publishing, 2013) Luding, S. (S.); Cruz-Hidalgo, R. (Raúl); Kanzaki, T. (T.); Alonso-Marroquin, F. (F.)
    General-purpose computation on Graphics Processing Units (GPU) on personal computers has recently become an attractive alternative to parallel computing on clusters and supercomputers. We present the GPU-implementation of an accurate molecular dynamics algorithm for a system of spheres. The new hybrid CPU-GPU implementation takes into account all the degrees of freedom, including the quaternion representation of 3D rotations. For additional versatility, the contact interaction between particles is defined using a force law of enhanced generality, which accounts for the elastic and dissipative interactions, and the hard-sphere interaction parameters are translated to the soft-sphere parameter set. We prove that the algorithm complies with the statistical mechanical laws by examining the homogeneous cooling of a granular gas with rotation. The results are in excellent agreement with well established mean-field theories for low-density hard sphere systems. This GPU technique dramatically reduces user waiting time, compared with a traditional CPU implementation.
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    An instrument for studying granular media in low-gravity environment
    (American Institute of Physics, 2018) Pöschel, T. (T.); Falcon, E. (Eric); Yu, P. (P.); Palencia, F. (F.); Fischer, D. (David); Luding, S. (S.); Fauve, S. (S.); Clement, E. (E.); Garrabos, Y. (Y.); Schockmel, J. (J.); Lecoutre, C. (C.); Stannarius, R. (Ralf); Opsomer, E. (E.); Hou, M. (M.); Cazaubiel, A. (A.); Noirhomme, M. (M.); Crassous, J. (Jérome); NO USAR Maza, D. (D.); Aumaitre, S. (S.); Montero, Á. (Ángel); Jia, X. (X.); Vandewalle, N. (N.); Sperl, M. (M.); Behringer, R.P. (R. P.); Durian, D.J. (D. J.)
    A new experimental facility has been designed and constructed to study driven granular media in a lowgravity environment. This versatile instrument, fully automatized, with a modular design based on several interchangeable experimental cells, allows to investigate research topics ranging from dilute to dense regimes of granular media such as granular gas, segregation, convection, sound propagation, jamming and rheology - all without the disturbance by gravitational stresses active on Earth. Here, we present the main parameters, protocols and performance characteristics of the instrument. The current scientific objectives are then briefly described and, as a proof of concept, some first selected results obtained in low gravity during parabolic flight campaigns are presented.