Sat, 26 Jul 2008 06:05:25 BST CiteULike: dchen's Alam http://www.citeulike.org/user/dchen/author/Alam CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2883352 <i>Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 75, No. 5. (2007)</i><br /><br />From event-driven simulations of a gravity-driven channel flow of inelastic hard disks, we show that the velocity distribution function remains close to a Gaussian for a wide range densities (even when the Knudsen number is of order 1) if the walls are smooth and the particle collisions are nearly elastic. For dense flows, a transition from a Gaussian to a power-law distribution for the high-velocity tails occurs with increasing dissipation in the center of the channel, irrespective of wall roughness. For a rough wall, the near-wall distribution functions are distinctly different from those in the bulk, even in the quasielastic limit. Velocity distribution and the effect of wall roughness in granular Poiseuille flow KC Vijayakumar Meheboob Alam doi:10.1103/PhysRevE.75.051306 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 75, No. 5. (2007) 2008-06-11T16:09:47-00:00 2007 Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) 75 5 APS 2007 boundary distribution flow grains pre velocity http://www.citeulike.org/user/dchen/article/2547984 <i>Physical Review Letters, Vol. 100, No. 6. (2008)</i><br /><br />Using particle simulations of the uniform shear flow of a rough dilute granular gas, we show that the translational and rotational velocities are strongly correlated in direction, but there is no orientational correlation-induced singularity at perfectly smooth (=-1) and rough (=1) limits for elastic collisions (e=1); both the translational and rotational velocity distribution functions remain close to a Gaussian for these two limiting cases. Away from these two limits, the orientational as well as spatial velocity correlations are responsible for the emergence of non-Gaussian high-velocity tails. The tails of both distribution functions follow stretched exponentials, with the exponents depending on normal (e) and tangential () restitution coefficients. Orientational Correlation and Velocity Distributions in Uniform Shear Flow of a Dilute Granular Gas Bishakdatta Gayen Meheboob Alam doi:10.1103/PhysRevLett.100.068002 Physical Review Letters, Vol. 100, No. 6. (2008) 2008-03-18T00:55:16-00:00 2008 Physical Review Letters 100 6 APS 2008 grain shear