Analytic dependence of the pressure and energy of an atomic fluid under shear.
Analytic dependence of the pressure and energy of an atomic fluid under shear.
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剪切下原子流体的压力和能量的解析依赖性。
DOI：
10.1103/physreve.63.021204
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
R. Sadus
中科院分区：
文献类型：
--
作者：
G. Marcelli;B. D. Todd;R. Sadus
非平衡分子动力学模拟报告在不同的应变率（γ）的剪切原子流体相互作用，通过准确的两体势和三体势。我们报告的静水压力有一个应变率依赖的γ;（2），在对比的γ;（3/2）依赖模式耦合理论预测。我们的结果表明，真实的流体的压力和能量可以显示出解析依赖于应变率。这与先前使用Lennard-Jones或Weeks-Chandler-安德森势的工作形成对比，这些势显示了压力和能量的γ（3/2）依赖性。
Nonequilibrium molecular dynamics simulations are reported at different strain rates (gamma;) for a shearing atomic fluid interacting via accurate two- and three-body potentials. We report that the hydrostatic pressure has a strain-rate dependence of gamma;(2), in contrast to the gamma;(3/2) dependence predicted by mode-coupling theory. Our results indicate that the pressure and energy of real fluids may display an analytic dependence on the strain rate. This is in contrast to previous work using either Lennard-Jones or Weeks-Chandler-Anderson potentials that had shown a gamma;(3/2) dependence of pressure and energy.