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

Communications in Computational Physics 2023年第1期33卷 118-143页

作者： F.Fadda a.lamura A.Tiribocchi Institute of Physics University of Amsterdam1098 XH AmsterdamThe Netherlands Department of Chemical Engineering Kyoto UniversityKyoto 615-8510Japan Dipartimento di Fisica and Sezione INFN Universit`a di BariVia Amendola 17370126 BariItaly Istituto Applicazioni Calcolo CNRVia Amendola 122/D70126 BariItaly Istituto Applicazioni Calcolo CNR via dei Taurini 1900185 RomeItaly

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.

关键词： Lattice Boltzmann simulations liquid crystals non-Newtonian fluids

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Investigation of contact behavior on a model of the dual-mobility artificial hip joint for Asians in different inner liner thicknesses

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World Journal of Orthopedics 2024年第4期15卷 321-336页

作者： Taufiq Hidayat Muhammad Imam Ammarullah Rifky Ismail Eko Saputra M Danny Pratama.lamura Chethan K N Athanasius Priharyoto Bayuseno J Jamari Department of Mechanical Engineering Universitas Muria KudusKudus 59352Central JavaIndonesia Department of Mechanical Engineering Universitas DiponegoroSemarang 50275Central JavaIndonesia Undip Biomechanics Engineering&Research Centre Universitas DiponegoroSemarang 50275Central JavaIndonesia Center for Biomechanics Biomaterials Biomechatronics and Biosignal Processing Universitas DiponegoroSemarang 50275Central JavaIndonesia Department of Mechanical Engineering Politeknik Negeri SemarangSemarang 50275Central JavaIndonesia Department of Aeronautical and Automobile Engineering Manipal Institute of TechnologyManipalManipal Academy of Higher EducationManipal 576104KarnatakaIndia

BACKGROUND The four components that make up the current dual-mobility artificial hip joint design are the femoral head,the inner liner,the outer liner as a metal cover to prevent wear,and the acetabular cup.The acetabular cup and the outer liner were constructed of 316L stainless steel.At the same time,the inner liner was made of ultra-high-molecular-weight polyethylene(UHMWPE).As this new dual-mobility artificial hip joint has not been researched extensively,more tribological research is needed to predict wear.The thickness of the inner liner is a significant component to consider when calculating the contact pressure.AIM To make use of finite element analysis to gain a better understanding of the contact behavior in various inner liner thicknesses on a new model of a dual-mobility artificial hip joint,with the ultimate objective of determining the inner liner thickness that was most suitable for this particular type of dual-mobility artificial hip joint.METHODS In this study,the size of the femoral head was compared between two diameters(28 mm and 36 mm)and eight inner liner thicknesses ranging from 5 mm to 12 mm.Using the finite element method,the contact parameters,including the maximum contact pressure and contact area,have been evaluated in light of the Hertzian contact theory.The simulation was performed statically with dissipated energy and asymmetric behavior.The types of interaction were surface-to-surface contact and normal contact behavior.RESULTS The maximum contact pressures in the inner liner(UHMWPE)at a head diameter of 28 mm and 36 mm are between 3.7-13.5 MPa and 2.7-10.4 MPa,respectively.The maximum von Mises of the inner liner,outer liner,and acetabular cup are 2.4–11.4 MPa,15.7–44.3 MPa,and 3.7–12.6 MPa,respectively,for 28 mm head.Then the maximum von Mises stresses of the 36 mm head are 1.9-8.9 MPa for the inner liner,9.9-32.8 MPa for the outer liner,and 2.6-9.9 MPa for the acetabular cup.A head with a diameter of 28 mm should have an inner liner with a thickness of 12 mm.Whereas the head dia

关键词： Contact behavior Contact pressure Finite element analysis Dual-mobility Artificial hip joint

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A Lattice Boltzmann Study of Phase Separation in Liquid-Vapor Systems with Gravity

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Communications in Computational Physics 2010年第2期7卷 350-361页

作者： Artur Cristea Giuseppe Gonnella Antonio lamura Victor Sofonea Center for Fundamental and Advanced Technical Research Romanian AcademyBd.Mihai Viteazul 24300223 Timi¸soaraRomania Dipartimento di Fisica Universita di Bari and INFNSezione di BariVia Amendola 17370126 BariItaly Istituto Applicazioni Calcolo CNRVia Amendola 122/D70126 BariItaly

Phase separation of a two-dimensional van der Waals fluid subject to a grav-itational force is studied by numerical simulations based on lattice Boltzmann methodsimplemented with a finite difference scheme. A growth e... 详细信息

关键词： Lattice Boltzmann phase separation liquid-vapor gravity

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