A lattice Boltzmann model with random dynamical constraints

Details A lattice Boltzmann model with random dynamical constraints A lattice Boltzmann model with random dynamical constraints

2004-05-11

arxiv.org/abs/cond-mat/0405214v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 9 figures, to be published in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2004-00187-8

In this paper we introduce a modified lattice Boltzmann model (LBM) with the capability of mimicking a fluid system with dynamic heterogeneities. The physical system is modeled as a one-dimensional fluid, interacting with finite-lifetime moving obstacles. Fluid motion is described by a lattice Boltzmann equation and obstacles are randomly distributed semi-permeable barriers which constrain the motion of the fluid particles. After a lifetime delay, obstacles move to new random positions. It is found that the non-linearly coupled dynamics of the fluid and obstacles produces heterogeneous patterns in fluid density and non-exponential relaxation of two-time autocorrelation function.

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