Towards a mesoscopic model of water-like fluids with hydrodynamic interactions

TL;DR

This paper introduces a mesoscopic lattice model for water-like fluids that captures complex structural dynamics and domain formation influenced by hydrogen-bond mimicking interactions, providing insights into water's unique density behavior.

Contribution

The model uniquely incorporates directional interactions and density-dependent forces to simulate water-like structural and density phenomena at a mesoscopic scale.

Findings

Formation of disordered domains influenced by directional order and thermal diffusivity

Correlation between low-density regions and ordered domains in the model

Replicates water's density behavior with disordered states being denser than ordered ones

Abstract

We present a mesoscopic lattice model for non-ideal fluid flows with directional interactions, mimicking the effects of hydrogen-bonds in water. The model supports a rich and complex structural dynamics of the orientational order parameter, and exhibits the formation of disordered domains whose size and shape depend on the relative strength of directional order and thermal diffusivity. By letting the directional forces carry an inverse density dependence, the model is able to display a correlation between ordered domains and low density regions, reflecting the idea of water as a denser liquid in the disordered state than in the ordered one.