https://doi.org/10.1140/epje/i2007-10311-4
ISMC-2007
Tunable-slip boundaries for coarse-grained simulations of fluid flow
1
Physics Faculty, Universität Bielefeld, D-33615, Bielefeld, Germany
2
Department of Physics and Centre for Scientific Computing, University of Warwick, CV4 7A1, Coventry, UK
* e-mail: schmid@physik.uni-bielefeld.de
Received:
31
October
2007
Accepted:
12
March
2008
Published online:
21
April
2008
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.
PACS: 47.11.-j Computational methods in fluid dynamics – / 47.61.-k Micro- and nano- scale flow phenomena –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2008
