Shape Asymmetry and Flexibility in Active Cross-Stream Migration in Nonuniform Shear
Phys. Rev. Lett. 135, 054001 – Published 30 July, 2025
DOI: https://doi.org/10.1103/6k4f-25hv
Abstract
We show that activity and broken fore-aft shape symmetry enable microswimmers to cross streamlines in nonuniform shear, a key yet overlooked factor in active cross-stream migration. Using a model of flagellated microswimmers in microchannel flow, we find that hydrodynamic coupling and flagellar flexibility significantly impact migration. A simplified theory identifies key factors driving the underlying rich nonlinear dynamics. Our findings apply to dynamics and control of both living and artificial microswimmers, while the hydrodynamic framework extends to diverse shear flow scenarios.
