Results 41 to 50 of about 4,695,040 (225)
Optimal Control of Active Nematics [PDF]
Physical Review Letters, 2020 In this work we present the first systematic framework to sculpt active nematics systems, using optimal control theory and a hydrodynamic model of active nematics. We demonstrate the use of two different control fields, (1) applied vorticity and (2) activity strength, to shape the dynamics of an extensile active nematic that is confined to a disk.
Michael M. Norton +3 more
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Morphology of Active Deformable 3D Droplets
Physical Review X, 2021 We numerically investigate the morphology and disclination line dynamics of active nematic droplets in three dimensions. Although our model incorporates only the simplest possible form of achiral active stress, active nematic droplets display an ...
Liam J. Ruske, Julia M. Yeomans
doaj +1 more source
Helical flow states in active nematics [PDF]
Physical Review E, 2022 4 pages, 4 figures ...
Keogh, Ryan R. +6 more
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Nematic order condensation and topological defects in inertial active nematics [PDF]
Physical Review E, 2022 Living materials at different length scales manifest active nematic features such as orientational order, nematic topological defects, and active nematic turbulence. Using numerical simulations we investigate the impact of fluid inertia on the collective pattern formation in active nematics.
Saghatchi, Roozbeh +2 more
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Data-Driven Discovery of Active Nematic Hydrodynamics. [PDF]
Physical Review Letters, 2022 Active nematics can be modeled using phenomenological continuum theories that account for the dynamics of the nematic director and fluid velocity through partial differential equations (PDEs).
Chaitanya Joshi +7 more
semanticscholar +1 more source
Defect dynamics in active nematics [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2014 Topological defects are distinctive signatures of liquid crystals. They profoundly affect the viscoelastic behaviour of the fluid by constraining the orientational structure in a way that inevitably requires global changes not achievable with any set of local deformations.
Giomi, Luca +4 more
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Wrinkling Instability in 3D Active Nematics [PDF]
Nano Letters, 2020 In nature interactions between biopolymers and motor proteins give rise to biologically essential emergent behaviours. Besides cytoskeleton mechanics, active nematics arise from such interactions. Here we present a study on 3D active nematics made of microtubules, kinesin motors and depleting agent. It shows a rich behaviour evolving from a nematically
Tobias Strübing +5 more
openaire +7 more sources
Colloids in two-dimensional active nematics: conformal cogs and controllable spontaneous rotation
New Journal of Physics, 2023 A major challenge in the study of active systems is to harness their non-equilibrium dynamics into useful work. We address this by showing how to design colloids with controllable spontaneous propulsion or rotation when immersed in active nematics.
Alexander J H Houston +1 more
doaj +1 more source
Frontiers in Physics, 2021 One objective of active matter science is to unveil principles by which chaotic microscale dynamics could be transformed into useful work. A nematic liquid crystal environment offers a number of possibilities, one of which is a directional motion of an ...
Mojtaba Rajabi +7 more
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Exact Coherent Structures and Phase Space Geometry of Preturbulent 2D Active Nematic Channel Flow. [PDF]
Physical Review Letters, 2021 Confined active nematics exhibit rich dynamical behavior, including spontaneous flows, periodic defect dynamics, and chaotic "active turbulence." Here, we study these phenomena using the framework of exact coherent structures, which has been successful ...
Caleb G. Wagner +3 more
semanticscholar +1 more source