从具有耗散和随机相互作用的流体模拟计算体积粘度和剪切粘度
软凝聚态物质
2016-06-22 v1
摘要
体积粘度和剪切粘度的精确值对于刻画流体特征十分重要,并且是连续介质描述的必要输入。本文我们提出两种新方法,通过对具有周期边界条件的稳态系统进行非平衡分子动力学(NEMD)模拟来计算体积粘度——一种基于频繁的粒子位移,另一种基于施加具有非均匀力分布的外加体积力。在平衡模拟中,粘度可通过 Green-Kubo 关系由应力张量涨落确定;然而,随机力和耗散力的正确纳入并不显然。我们讨论文献中提出的各种表达式,并以耗散粒子动力学(DPD)流体为例对它们进行测试。
引用
@article{arxiv.1605.03011,
title = {Computing bulk and shear viscosities from simulations of fluids with dissipative and stochastic interactions},
author = {Gerhard Jung and Friederike Schmid},
journal= {arXiv preprint arXiv:1605.03011},
year = {2016}
}
备注
8 pages, 7 figures. The following article has been accepted by Journal of Chemical Physics. After it is published, it will be found at http://scitation.aip.org/content/aip/journal/jcp