Protocol-independent granular temperature supported by numerical simulations.
Protocol-independent granular temperature supported by numerical simulations.
复制标题
由数值模拟支持的与协议无关的颗粒温度。
DOI：
10.1103/physreve.92.052201
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Kassner
中科院分区：
文献类型：
--
作者：
V. Becker;K. Kassner
一个可能的方法来统计描述颗粒组合从爱德华兹的假设开始，即所有阻塞状态占据相同的体积是等可能的[爱德华兹和Oakeshott，物理学A 157, 1080(1989)]。我们使用二维多边形粒子进行了计算机模拟，根据两种不同的方案周期性地激发：由“负重力”脉冲激发和由“旋转重力”激发。第一种方案显示出平均体积分数对脉冲强度的非单调依赖性。为了检验体积分布是否为类玻尔兹曼分布，并计算逆紧性和分区和的对数，采用重叠直方图方法。我们发现平均体积是测量颗粒温度的唯一函数，独立于协议和分支的φ (g)，并且所有确定的量都与爱德华兹的理论一致。
A possible approach to the statistical description of granular assemblies starts from Edwards's assumption that all blocked states occupying the same volume are equally probable [Edwards and Oakeshott, Physica A 157, 1080 (1989)]. We performed computer simulations using two-dimensional polygonal particles excited periodically according to two different protocols: excitation by pulses of "negative gravity" and excitation by "rotating gravity." The first protocol exhibits a nonmonotonous dependency of the mean volume fraction on the pulse strength. The overlapping histogram method is used in order to test whether the volume distribution is described by a Boltzmann-like distribution and to calculate the inverse compactivity as well as the logarithm of the partition sum. We find that the mean volume is a unique function of the measured granular temperature, independently of the protocol and of the branch in ϕ(g), and that all determined quantities are in agreement with Edwards's theory.
影响因子：
8.6
作者：
R. Blumenfeld;Joe F. Jordan;S. Edwards
通讯作者：
R. Blumenfeld;Joe F. Jordan;S. Edwards