Simulations of strongly phase-separated liquid-gas systems

Details Simulations of strongly phase-separated liquid-gas systems Simulations of strongly phase-separated liquid-gas systems

2006-08-22

arxiv.org/abs/cond-mat/0608480v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

Lattice Boltzmann simulations of liquid-gas systems are believed to be restricted to modest density ratios of less than 10. In this article we show that reducing the speed of sound and, just as importantly, the interfacial contributions to the pressure allows lattice Boltzmann simulations to achieve high density ratios of 1000 or more. We also present explicit expressions for the limits of the parameter region in which the method gives accurate results. There are two separate limiting phenomena. The first is the stability of the bulk liquid phase. This consideration is specific to lattice Boltzmann methods. The second is a general argument for the interface discretization that applies to any diffuse interface method.

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