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Ring kinetic theory for an idealized granular gas

机译:理想颗粒气体的环动力学理论

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The dynamics of inelastic hard spheres is described in terms of the binary collision expansion, yielding the corresponding pseudo-liouville equation and BBGKY hierarchy for the reduced distribution functions. Based on cluster expansion techniques we derive the Boltzmann and ring kinetic equations for inelastic hard spheres. In the simple ring approximation, we calculate the structure factor S-perpendicular to(k,t) of vorticity fluctuations in a freely evolving, dilute granular gas. The kinetic theory result agrees with the result derived previously from fluctuating hydrodynamics. If the fluctuations in the flow field can be considered incompressible, S-perpendicular to(k,t) determines the spatial correlations in the flow velocities, which are of dynamic origin and exhibit long range r(-d)-behavior. The analytic results are compared with molecular dynamics simulations. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 40]
机译:用二元碰撞展开来描述非弹性硬球体的动力学,从而产生相应的伪-liouville方程和用于简化分布函数的BBGKY层次结构。基于簇展开技术,我们推导了非弹性硬球体的玻尔兹曼和环动力学方程。在简单的环近似中,我们计算与自由演化的稀颗粒气体中的涡度波动垂直的结构因子S(垂直于(k,t))。动力学理论结果与先前从波动流体力学得出的结果一致。如果可以认为流场中的波动是不可压缩的,则S垂直于(k,t)确定流动速度中的空间相关性,这些速度相关性是动态起源的,并且表现出长距离r(-d)行为。将分析结果与分子动力学模拟进行比较。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:40]

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