Pinned Flexible Polymer under Oscillatory Linear Flow

The non-equilibrium structural and dynamical properties of a flexible polymer pinned to a reflecting wall and subject to oscillatory linear flow are studied by numerical simulations. Polymer is confined in two dimensions and is modeled as a bead-spring chain while the interaction with the fluid is described by the Brownian multiparticle collision dynamics. At low strain the polymer is stretched along the flow direction. When increasing strain, chains are completely elongated and compressed against the wall when the flow is reverted. The conformations are analyzed and compared to the case of stiffer polymers [1]. The dynamics is investigated by looking at the motion of the center of mass which shows a frequency doubling along the shear direction. [1] A. Lamura, R. G. Winkler, and G. Gompper, Wall-Anchored Semiflexible Polymer under Large Amplitude Oscillatory Shear, J. Chem. Phys. 154, 224901 (2021).