Characteristic features of self-avoiding active Brownian polymers under linear shear flow

Panda, Arindam; Winkler, Roland G.; Singh, Sunil P.

doi:10.1039/d3sm01334k

Soft Matter

2023

DOI: 10.1039/d3sm01334k

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Characteristic features of self-avoiding active Brownian polymers under linear shear flow

Arindam Panda,

Roland G. Winkler,

Sunil P. Singh

Abstract: We present Brownian dynamics simulation results of a flexible linear polymer with excluded-volume interactions under shear flow in the presence of active noise.

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2024

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Cited by 3 publications

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Active polar ring polymer in shear flow—An analytical study

Winkler,

Singh

2024

The Journal of Chemical Physics

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We theoretically study the conformational and dynamical properties of semiflexible active polar ring polymers under linear shear flow. A ring is described as a continuous semiflexible Gaussian polymer with a tangential active force of a constant density along its contour. The linear but non-Hermitian equation of motion is solved using an eigenfunction expansion, which yields activity-independent, but shear-rate-dependent, relaxation times and activity-dependent frequencies. As a consequence, the ring’s stationary-state properties are independent of activity, and its conformations and rheological properties are equal to those of a passive ring under shear. The presence of characteristic time scales by relaxation and the activity-dependent frequencies give rise to a particular dynamical behavior. A tank-treading-like motion emerges for long relaxation times and high activities, specifically for stiff rings. In the case of very flexible polymers, the relaxation behavior dominates over activity contributions suppressing tank-treading. Shear strongly affects the crossover from a tank-treading to a relaxation-dominated dynamics, and the ring polymer exhibits tumbling motion at high shear rates. This is reflected in the tumbling frequency, which displays two shear-rate dependent regimes, with an activity-dependent plateau at low shear rates followed by a power-law regime with increasing tumbling frequency for high shear rates.

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Active polar ring polymer in shear flow—An analytical study

Winkler,

Singh

2024

The Journal of Chemical Physics

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Excluded volume effects on tangentially driven active ring polymers

Lamura

2024

Phys. Rev. E

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Dry polymer model for a string of pushers: Nontrivial scaling of tumbling time with shear rate

Saju,

Manna,

Kumar

2024

Phys. Rev. Research

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Understanding the dynamics of active polymers is an important component for modeling the dynamic response of biological cells and microorganisms when subjected to external forces. A minimal computational model of active filaments that captures all the essential features of activity-induced filament motion is required to study large systems of dense suspensions. In this paper we present a model of a dry active polymer, compare its steady-state static and dynamic properties with those of a polymer consisting of extensile stresslets, and show that the two models give very similar results. When subjected to shear flow, both models show two distinct regimes in the tumbling interval as a function of shear rate, with a diffuse crossover regime in between. At high shear rate, the active and passive polymers follow the same power law for the tumbling interval. However, the tumbling interval is smaller than that of the passive polymer for low shear rates and larger for the high shear rate. We show that activity-induced large bends increase the coupling of the polymer with the shear gradient in the low-shear-rate regime, leading to a decrease in the tumbling interval. However, in the high-shear-rate regime, the active forces on the folds at the end of the stretched polymer prevent it from tumbling, leading to a larger tumbling interval. We show that the critical shear rate, at which the tumbling interval versus the shear-rate curve of the active polymer crosses that of the passive polymer, is determined by the balance of bending and shear forces and increases with κ/N3, where κ is the bending coefficient and N is the length of the polymer. Published by the American Physical Society 2024

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Characteristic features of self-avoiding active Brownian polymers under linear shear flow

Abstract: We present Brownian dynamics simulation results of a flexible linear polymer with excluded-volume interactions under shear flow in the presence of active noise.

Cited by 3 publications

References 122 publications

Active polar ring polymer in shear flow—An analytical study

Active polar ring polymer in shear flow—An analytical study

Excluded volume effects on tangentially driven active ring polymers

Dry polymer model for a string of pushers: Nontrivial scaling of tumbling time with shear rate

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