@Article{CiCP-33-1,
author = {Fadda, F. and Lamura, A. and Tiribocchi, A.},
title = {Lattice Boltzmann Modeling of Cholesteric Liquid Crystal Droplets Under an Oscillatory Electric Field},
journal = {Communications in Computational Physics},
year = {2023},
volume = {33},
number = {1},
pages = {118--143},
abstract = {<p style="text-align: justify;">We numerically study the dynamics of quasi-two dimensional cholesteric
liquid crystal droplets in the presence of a time-dependent electric field, rotating at
constant angular velocity. A surfactant sitting at the droplet interface is also introduced to prevent droplet coalescence. The dynamics is modeled following a hybrid
numerical approach, where a standard lattice Boltzmann technique solves the Navier-Stokes equation and a finite difference scheme integrates the evolution equations of
liquid crystal and surfactant. Our results show that, once the field is turned on, the liquid crystal rotates coherently triggering a concurrent orbital motion of both droplets
around each other, an effect due to the momentum transfer to the surrounding fluid.
In addition the topological defects, resulting from the conflict orientation of the liquid crystal within the drops, exhibit a chaotic-like motion in cholesterics with a high
pitch, in contrast with a regular one occurring along circular trajectories observed in
nematics drops. Such behavior is found to depend on magnitude and frequency of the
applied field as well as on the anchoring of the liquid crystal at the droplet interface.
These findings are quantitatively evaluated by measuring the angular velocity of fluid
and drops for various frequencies of the applied field.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.OA-2022-0027},
url = {https://global-sci.com/article/79407/lattice-boltzmann-modeling-of-cholesteric-liquid-crystal-droplets-under-an-oscillatory-electric-field}
}