Tethered Semiflexible Polymer under Large Amplitude Oscillatory Shear

Abstract

The properties of a semiflexible polymer with fixed ends exposed to oscillatory shear flow are investigated by simulations. The two-dimensionally confined polymer is modeled as a linear bead-spring chain, and the interaction with the fluid is described by the Brownian multiparticle collision dynamics approach. For small shear rates, the tethering of the ends leads to a more-or-less linear oscillatory response. However, at high shear rates, we found a strongly nonlinear reaction, with a polymer (partially) wrapped around the fixation points. This leads to an overall shrinkage of the polymer. Dynamically, the location probability of the polymer center-of-mass position is largest on a spatial curve resembling a limaçon, although with an inhomogeneous distribution. We found shear-induced modifications of the normal-mode correlation functions, with a frequency doubling at high shear rates. Interestingly, an even-odd asymmetry for the Cartesian components of the correlation functions appears, with rather similar spectra for odd $x$- and even $y$-modes and vice versa. Overall, our simulations yielded an intriguing nonlinear behavior of tethered semiflexible polymers under oscillatory shear flow.

References in corpus (11)

• Multi-particle-collision dynamics: Flow around a circular and a square cylinder
• Semidilute Polymer Solutions at Equilibrium and under Shear Flow
• Single Polymer Dynamics for Molecular Rheology
• Statistics of tumbling of a single polymer molecule in shear flow
• Polymer collapse in the presence of hydrodynamic interactions
• Migration of semiflexible polymers in microcapillary flow
• Mesoscale simulations of polymer dynamics in microchannel flows
• Flow-Induced Helical Coiling of Semiflexible Polymers in Structured Microchannels
• Rouse Chains with Excluded Volume Interactions: Linear Viscoelasticity
• Tumbling motion of a single chain in shear flow: a crossover from Brownian to non-Brownian behavior
• Semiflexible polymers under external fields confined to two dimensions

Cited by in corpus (5)

• Wall-anchored semiflexible polymer under large amplitude oscillatory shear flow
• Self-attractive semiflexible polymers under an external force field
• Tethered flexible polymer under oscillatory linear flow
• Two-dimensional active polar semiflexible polymer under shear flow
• Trypanosoma brucei moving in microchannels and through constrictions