Issue |
EPL
Volume 86, Number 4, May 2009
|
|
---|---|---|
Article Number | 44001 | |
Number of page(s) | 6 | |
Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
DOI | https://doi.org/10.1209/0295-5075/86/44001 | |
Published online | 27 May 2009 |
On the microscopic foundation of dissipative particle dynamics
1
Department of Physics, University of Gothenburg - SE-41296 Göteborg, Sweden, EU
2
Complex Systems Group, Department of Energy and Environment, Chalmers University of Technology SE-41296 Göteborg, Sweden, EU
Corresponding author: kolbjorn@chalmers.se
Received:
26
February
2009
Accepted:
21
April
2009
Mesoscopic-particle–based fluid models, such as dissipative particle dynamics, are usually assumed to be coarse-grained representations of an underlying microscopic fluid. A fundamental question is whether there exists a map from microscopic particles in these systems to the corresponding coarse-grained particles, such that the coarse-grained system has the same bulk and transport properties as the underlying system. In this letter, we investigate the coarse-graining of microscopic fluids using a Voronoi-type projection that has been suggested in several studies. The simulations show that the projection fails in defining coarse-grained particles that have a physically meaningful connection to the microscopic fluid. In particular, the Voronoi projection produces identical coarse-grained equilibrium properties when applied to systems with different microscopic interactions and different bulk properties.
PACS: 47.11.-j – Computational methods in fluid dynamics / 47.11.St – Multi-scale methods / 47.57.-s – Complex fluids and colloidal systems
© EPLA, 2009
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