Kanzaki, T. (T.)

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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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    Stress distribution of faceted particles in a silo after its partial discharge
    (EDP Sciences / Springer-Verlag, 2011-12-28) Pagonabarraga, I. (Ignacio); Zuriguel-Ballaz, I. (Iker); Hidalgo, R.C. (R. C.); Kanzaki, T. (T.); Acevedo-Escalante, M. (Manuel Francisco); Maza-Ozcoidi, D. (Diego)
    We present experimental and numerical results of the effect that a partial discharge has on the morphological and micro-mechanical properties of non-spherical, convex particles in a silo. The comparison of the particle orientation after filling the silo and its subsequent partial discharge reveals important shearinduced orientation, which affects stress propagation. For elongated particles, the flow induces an increase in the packing disorder which leads to a reduction of the vertical stress propagation developed during the deposit generated prior to the partial discharge. For square particles, the flow favors particle alignment with the lateral walls promoting a behavior opposite to the one of the elongated particles: vertical force transmission, parallel to gravity, is induced. Hence, for elongated particles the flow developed during the partial discharge of the silo leads to force saturation with depth whereas for squares the flow induces hindering of the force saturation observed during the silo filling.