Lattice Boltzmann Modeling of Cholesteric Liquid Crystal Droplets Under an Oscillatory Electric Field

作     者：F.Fadda A.Lamura A.Tiribocchi 

作者机构：Institute of PhysicsUniversity of Amsterdam1098 XH AmsterdamThe Netherlands Department of Chemical EngineeringKyoto UniversityKyoto 615-8510Japan Dipartimento di Fisica and Sezione INFNUniversit`a di BariVia Amendola 17370126 BariItaly Istituto Applicazioni CalcoloCNRVia Amendola 122/D70126 BariItaly Istituto Applicazioni Calcolo CNRvia dei Taurini 1900185 RomeItaly 

出 版 物：《Communications in Computational Physics》 (计算物理通讯（英文）)

年 卷 期：2023年第33卷第1期

页      面：118-143页

核心收录：

学科分类：07[理学] 0701[理学-数学] 0702[理学-物理学] 070101[理学-基础数学] 

基　　金：funding from the Japan Society for the Promotion of Science(JSPS)KAKENHI grant 17H01083 funding from the National Science Foundation under Grant No.NSF PHY-1748958 D-ITP consortium,a program of the Netherlands Organization for Scientific Research(NWO)that is funded by the Dutch Ministry of Education,Culture and Science(OCW) funding from the European Research Council under the European Union’s Horizon 2020 Framework Programme(No.FP/2014-2020)ERC Grant Agreement No.739964(COPMAT) A.T.also warmly thanks Livio Carenza and Davide Marenduzzo for useful discussions.A.L.acknowledges funding from MIUR Project No.PRIN 2020/PFCXPE 

主　　题：Lattice Boltzmann simulations liquid crystals non-Newtonian fluids 

摘      要：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 *** 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 *** 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 *** 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 *** 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 *** findings are quantitatively evaluated by measuring the angular velocity of fluid and drops for various frequencies of the applied field.