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Machine learning active-nematic hydrodynamics [PDF]
Proceedings of the National Academy of Sciences, 2021 Hydrodynamic theories effectively describe many-body systems out of equilibrium in terms of a few macroscopic parameters. However, such parameters are difficult to determine from microscopic information. Seldom is this challenge more apparent than in active matter, where the hydrodynamic parameters are in fact fields that encode the distribution of ...
Jonathan Colen +12 more
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Defect dynamics in active nematics. [PDF]
Philos Trans A Math Phys Eng Sci, 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 L +4 more
europepmc +6 more sources
Active nematic multipoles: Flow responses and the dynamics of defects and colloids
Frontiers in Physics, 2023 We introduce a general description of localised distortions in active nematics using the framework of active nematic multipoles. We give the Stokesian flows for arbitrary multipoles in terms of differentiation of a fundamental flow response and describe ...
Alexander J. H. Houston +3 more
doaj +1 more source
Frontiers in Physics, 2022 Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids.
Fabian Jan Schwarzendahl +3 more
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Active nematics on flat surfaces: From droplet motility and scission to active wetting
Physical Review Research, 2023 We consider the dynamics of active nematics droplets on flat surfaces, based on the continuum hydrodynamic theory. We investigate a wide range of dynamical regimes as a function of the activity and droplet size on surfaces characterized by strong ...
Rodrigo C. V. Coelho +2 more
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Active nematic emulsions [PDF]
Science Advances, 2018 Droplets of active fluid form a dynamically self-assembled material based on the cross-talk between active and passive defects.
Guillamat, Pau +5 more
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Braiding Dynamics in Active Nematics
Frontiers in Physics, 2022 In active matter systems, energy consumed at the small scale by individual agents gives rise to emergent flows at large scales. For 2D active nematic microtubule (ANMT) systems, these flows are largely characterized by the dynamics of mobile defects in ...
Spencer Ambrose Smith, Ruozhen Gong
doaj +1 more source
Self-propulsive active nematics. [PDF]
Philos Trans A Math Phys Eng SciIncreasing evidence suggests that active matter exhibits instances of mixed symmetry that cannot be fully described by either polar or nematic formalism. Here, we introduce a minimal model that integrates self-propulsion into the active nematic framework.
de Graaf Sousa N +3 more
europepmc +4 more sources
Active nematics with quenched disorder [PDF]
Physical Review E, 2020 We introduce a two-dimensional active nematic with quenched disorder. We write the coarse-grained hydrodynamic equations of motion for slow variables, viz. density, and orientation. Disorder strength is tuned from zero to large values. Results from the numerical solution of equations of motion as well as the calculation of two-point orientation ...
Sameer Kumar, Shradha Mishra
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Machine learning forecasting of active nematics [PDF]
Soft Matter, 2021 Our model is unrolled to map an input orientation sequence (from time t-8 to t-1) to an output one (t,t + 1…) with trajectray tracing. Cyan labels are −1/2 defect while purple ones are +1/2.
Zhengyang Zhou +8 more
openaire +3 more sources