Molecular dynamics study of shear-induced long-range correlations in simple fluids
Molecular dynamics study of shear-induced long-range correlations in simple fluids
复制标题
简单流体中剪切引起的长程相关性的分子动力学研究
DOI:
10.1103/physrevresearch.4.023147
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发表时间:
2022
影响因子:
4.2
通讯作者:
Minami Yuki
中科院分区:
文献类型:
--
作者:
Nakano Hiroyoshi;Minami Yuki
We investigate long-range correlations (LRCs) induced by shear flow using the molecular dynamics (MD) simulation. We observe the LRCs by comparing the MD result with the linearized fluctuating hydrodynamics (LFH). We find that the MD result has large finite-size effects, and it prevents the occurrence of LRCs in small systems. We examine the finite-size effects using sufficiently large systems consisting of more than ten million particles, and verify the existence of shear-induced LRCs without ambiguity. Furthermore, we show that MD result is quantitatively consistent with the LFH solution for the large system. As we reduce the system sizeor increase the shear rate, the hydrodynamic description gradually breaks down in the long-wavelength region. We define a characteristic wave numberassociated with the breakdown and find the nontrivial scaling relationsand, whereis an exponent depending on. These relations enable us to estimate the finite-size effects in a larger-size simulation from a smaller system.
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