Dynamically generated patterns in dense suspensions of active filaments

Prathyusha Kokkoorakunnel Ramankutty, Silke Henkes, Rastko Sknepnek (Lead / Corresponding author)

Research output: Contribution to journalArticle

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Abstract

We use Langevin dynamics simulations to study dynamical behavior of a dense planar layer of active semiflexible filaments. Using the strength of active force and the thermal persistence length as parameters, we map a detailed phase diagram and identify several nonequilibrium phases in this system. In addition to a slowly flowing melt phase, we observe that, for sufficiently high activity, collective flow accompanied by signatures of local polar and nematic order appears in the system. This state is also characterized by strong density fluctuations. Furthermore, we identify an activity-driven crossover from this state of coherently flowing bundles of filaments to a phase with no global flow, formed by individual filaments coiled into rotating spirals. This suggests a mechanism where the system responds to activity by changing the shape of active agents, an effect with no analog in systems of active particles without internal degrees of freedom.

Original languageEnglish
Article number022606
JournalPhysical Review E: Statistical, Nonlinear, and Soft Matter Physics
Volume97
Issue number2
DOIs
Publication statusPublished - 12 Feb 2018

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Filament
filaments
Active Particles
Langevin Dynamics
bundles
crossovers
degrees of freedom
phase diagrams
signatures
Dynamical Behavior
Dynamic Simulation
Persistence
analogs
Phase Diagram
Non-equilibrium
Crossover
Bundle
Rotating
Signature
Degree of freedom

Cite this

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title = "Dynamically generated patterns in dense suspensions of active filaments",
abstract = "We use Langevin dynamics simulations to study dynamical behavior of a dense planar layer of active semiflexible filaments. Using the strength of active force and the thermal persistence length as parameters, we map a detailed phase diagram and identify several nonequilibrium phases in this system. In addition to a slowly flowing melt phase, we observe that, for sufficiently high activity, collective flow accompanied by signatures of local polar and nematic order appears in the system. This state is also characterized by strong density fluctuations. Furthermore, we identify an activity-driven crossover from this state of coherently flowing bundles of filaments to a phase with no global flow, formed by individual filaments coiled into rotating spirals. This suggests a mechanism where the system responds to activity by changing the shape of active agents, an effect with no analog in systems of active particles without internal degrees of freedom.",
author = "{Kokkoorakunnel Ramankutty}, Prathyusha and Silke Henkes and Rastko Sknepnek",
note = "RS acknowledges the support from UK EPSRC (EP/M009599/1) and SH acknowledges support from UK BBSRC (BB/N009150/1).",
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Dynamically generated patterns in dense suspensions of active filaments. / Kokkoorakunnel Ramankutty, Prathyusha; Henkes, Silke; Sknepnek, Rastko (Lead / Corresponding author).

In: Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, Vol. 97, No. 2, 022606, 12.02.2018.

Research output: Contribution to journalArticle

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T1 - Dynamically generated patterns in dense suspensions of active filaments

AU - Kokkoorakunnel Ramankutty, Prathyusha

AU - Henkes, Silke

AU - Sknepnek, Rastko

N1 - RS acknowledges the support from UK EPSRC (EP/M009599/1) and SH acknowledges support from UK BBSRC (BB/N009150/1).

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Y1 - 2018/2/12

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AB - We use Langevin dynamics simulations to study dynamical behavior of a dense planar layer of active semiflexible filaments. Using the strength of active force and the thermal persistence length as parameters, we map a detailed phase diagram and identify several nonequilibrium phases in this system. In addition to a slowly flowing melt phase, we observe that, for sufficiently high activity, collective flow accompanied by signatures of local polar and nematic order appears in the system. This state is also characterized by strong density fluctuations. Furthermore, we identify an activity-driven crossover from this state of coherently flowing bundles of filaments to a phase with no global flow, formed by individual filaments coiled into rotating spirals. This suggests a mechanism where the system responds to activity by changing the shape of active agents, an effect with no analog in systems of active particles without internal degrees of freedom.

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