Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-05-07
Chemical Physics 375 (2010) 327-336
Physics
Condensed Matter
Soft Condensed Matter
12 pages, 10 figures. To be published in the special issue "Stochastic Processes in Physics and Chemistry" of Chemical Physics
Scientific paper
10.1016/j.chemphys.2010.05.008
The correlations of the fluctuating stress tensor are calculated in an equilibrium molecular-dynamics simulation of a Lennard--Jones liquid. We define a coarse-grained local stress tensor which can be calculated numerically and which allows for the first time to determine the stress correlation function both in time and in space. Our findings corroborate the assumptions made in fluctuating hydrodynamics as long as the liquid is isotropic, that is in bulk. In the vicinity of a rigid plate, however, the isotropy is restricted, and major modifications must be done with respect to the usual theory. Among these are the appearance of five different viscosities instead of two and a non-trivial dependence of the distance from the wall. We determine these viscosities from the simulation data and find that their values are very different from the bulk values. We further find much longer relaxation times of the stress correlations than in bulk.
No associations
LandOfFree
A numerical test of stress correlations in fluctuating hydrodynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A numerical test of stress correlations in fluctuating hydrodynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A numerical test of stress correlations in fluctuating hydrodynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-222723