Results 51 to 60 of about 2,992 (173)
Velocity Correlations in an Active Nematic [PDF]
Physical Review Letters, 2013 The flow properties of a continuum model for an active nematic is studied and compared with recent experiments on suspensions of microtubule bundles and molecular motors. The velocity correlation length is found to be independent of the strength of the activity while the characteristic velocity scale increases monotonically as the activity is increased,
Sumesh P. Thampi +2 more
openaire +4 more sources
Boltzmann-Ginzburg-Landau approach for continuous descriptions of generic Vicsek-like models [PDF]
, 2014 We describe a generic theoretical framework, denoted as the Boltzmann-Ginzburg-Landau approach, to derive continuous equations for the polar and/or nematic order parameters describing the large scale behavior of assemblies of point-like active particles ...
Bertin, Eric +3 more
core +4 more sources
Proceedings of the National Academy of SciencesMicrofluidics involves the manipulation of flows at the microscale, typically requiring external power sources to generate pressure gradients. Alternatively, harnessing flows from active fluids, which are usually chaotic, has been proposed as a paradigm for the development of micromachines.
Ignasi Vélez-Cerón +6 more
openaire +3 more sources
A unified field theory of topological defects and non-linear local excitations
npj Computational Materials, 2023 Topological defects and smooth excitations determine the properties of systems showing collective order. We introduce a generic non-singular field theory that comprehensively describes defects and excitations in systems with O(n) broken rotational ...
Vidar Skogvoll +3 more
doaj +1 more source
Geometry and Topology of Turbulence in Active Nematics
Physical Review X, 2015 The problem of low Reynolds number turbulence in active nematic fluids is theoretically addressed. Using numerical simulations, I demonstrate that an incompressible turbulent flow, in two-dimensional active nematics, consists of an ensemble of vortices ...
Luca Giomi
doaj +1 more source
Antipolar ordering of topological defects in active liquid crystals [PDF]
, 2016 ATP-driven microtubule-kinesin bundles can self-assemble into two-dimensional active liquid crystals (ALCs) that exhibit a rich creation and annihilation dynamics of topological defects, reminiscent of particle-pair production processes in quantum ...
Dunkel, Jörn, Oza, Anand U.
core +2 more sources
Driven active and passive nematics
, 2015 We investigate similarities in the micro-structural dynamics between externally driven and actively driven nematics. Walls, lines of strong deformations in the director field, and topological defects are characteristic features of an active nematic ...
Golestanian, Ramin +2 more
core +1 more source
Dynamical subclasses of dry active nematics [PDF]
Physical Review E, 2019 5 pages, 4 figures.
Cai, Li-Bing +3 more
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Hydrodynamics of Active Defects: From Order to Chaos to Defect Ordering
Physical Review X, 2019 Topological defects play a prominent role in the physics of two-dimensional materials. When driven out of equilibrium in active nematics, disclinations can acquire spontaneous self-propulsion and drive self-sustained flows upon proliferation.
Suraj Shankar, M. Cristina Marchetti
doaj +1 more source
Cross-talk between topological defects in different fields revealed by nematic microfluidics [PDF]
, 2017 Topological defects are singularities in material fields that play a vital role across a range of systems: from cosmic microwave background polarization to superconductors, and biological materials.
Giomi, Luca +3 more
core +3 more sources