Focusing of active particles in a converging flow

Mykhailo Potomkin, Andreas Kaiser, Leonid Berlyand, Igor Aranson

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We consider active particles swimming in a convergent fluid flow in a trapezoid nozzle with no-slip walls. We use mathematical modeling to analyze trajectories of these particles inside the nozzle. By extensive Monte Carlo simulations, we show that trajectories are strongly affected by the background fluid flow and geometry of the nozzle leading to wall accumulation and upstream motion (rheotaxis). In particular, we describe the non-trivial focusing of active rods depending on physical and geometrical parameters. It is also established that the convergent component of the background flow leads to stability of both downstream and upstream swimming at the centerline. The stability of downstream swimming enhances focusing, and the stability of upstream swimming enables rheotaxis in the bulk.

Original languageEnglish (US)
Article number115005
JournalNew Journal of Physics
Issue number11
StatePublished - Nov 2017

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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