Dissipative particle dynamics for interacting systems

Details Dissipative particle dynamics for interacting systems Dissipative particle dynamics for interacting systems

2001-05-03

arxiv.org/abs/cond-mat/0105075v1

Physics

Condensed Matter

Soft Condensed Matter

25 pages, 12 figures

Scientific paper

10.1063/1.1396848

We introduce a dissipative particle dynamics scheme for the dynamics of non-ideal fluids. Given a free-energy density that determines the thermodynamics of the system, we derive consistent conservative forces. The use of these effective, density dependent forces reduces the local structure as compared to previously proposed models. This is an important feature in mesoscopic modeling, since it ensures a realistic length and time scale separation in coarse-grained models. We consider in detail the behavior of a van der Waals fluid and a binary mixture with a miscibility gap. We discuss the physical implications of having a single length scale characterizing the interaction range, in particular for the interfacial properties.

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