Velocity correlations in dense granular shear flows: Effects on energy dissipation and normal stress

Namiko Mitarai, Hiizu Nakanishi

研究成果: ジャーナルへの寄稿記事

62 引用 (Scopus)

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We study the effect of precollisional velocity correlations on granular shear flow by molecular dynamics simulations of an inelastic hard sphere system. Comparison of the simulations with kinetic theory reveals that the theory overestimates both the energy dissipation rate and the normal stress in the dense flow region. We find that the relative normal velocity of colliding particles is smaller than that expected from random collisions, and the discrepancies in the dissipation and the normal stress can be adjusted by introducing the idea of the collisional temperature, from which we conclude that the velocity correlation neglected in the kinetic theory is responsible for the discrepancies. Our analysis of the distributions of the precollisional velocity suggests that the correlation grows through multiple inelastic collisions during the time scale of the inverse of the shear rate. As for the shear stress, the discrepancy is also found in the dense region, but it depends strongly on the particle inelasticity.

元の言語英語
記事番号031305
ジャーナルPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
75
発行部数3
DOI
出版物ステータス出版済み - 3 26 2007

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All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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