Tunable-slip boundaries for coarse-grained simulations of fluid flow
Abstract
On the micro- and nanoscale, classical hydrodynamic boundary conditions such as the no-slip condition no longer apply. Instead, the flow profiles exhibit ``slip`` at the surface, which is characterized by a finite slip length (partial slip). We present a new, systematic way of implementing partial-slip boundary conditions with arbitrary slip length in coarse-grained computer simulations. The main idea is to represent the complex microscopic interface structure by a spatially varying effective viscous force. An analytical equation for the resulting slip length can be derived for planar and for curved surfaces. The comparison with computer simulations of a DPD (dissipative particle dynamics) fluid shows that this expression is valid from full-slip to no-slip.
Cite
@article{arxiv.0712.3592,
title = {Tunable-slip boundaries for coarse-grained simulations of fluid flow},
author = {Jens Smiatek and Michael P. Allen and Friederike Schmid},
journal= {arXiv preprint arXiv:0712.3592},
year = {2009}
}
Comments
submitted to Eur. Phys. J. E (accepted)