A mesoscopic model for binary fluids

TL;DR

This paper introduces a simple, efficient mesoscopic model for symmetric binary fluids using multiparticle collision dynamics, accurately capturing phase separation, interface properties, and behavior in crowded environments.

Contribution

The paper presents a novel mesoscopic model that simulates binary fluids without force calculations, maintaining key physical invariances and conserving mass and energy.

Findings

Accurately reproduces density profiles and interface widths.

Captures phase separation and growth dynamics.

Effective in crowded environment simulations.

Abstract

We propose a model to study symmetric binary fluids, based in the mesoscopic molecular simulation technique known as multiparticle collision, where space and state variables are continuous while time is discrete. We include a repulsion rule to simulate segregation processes that does not require the calculation of the interaction forces between particles, thus allowing the description of binary fluids at a mesoscopic scale. The model is conceptually simple, computationally efficient, maintains Galilean invariance, and conserves the mass and the energy in the system at micro and macro scales; while momentum is conserved globally. For a wide range of temperatures and densities, the model yields results in good agreement with the known properties of binary fluids, such as density profile, width of the interface, phase separation and phase growth. We also apply the model to study binary fluids in crowded environments with consistent results.