How inertial lift affects the dynamics of a microswimmer in Poiseuille flow

Author:

Choudhary AkashORCID,Paul Subhechchha,Rühle FelixORCID,Stark HolgerORCID

Abstract

AbstractThe transport of motile microorganisms is strongly influenced by fluid flows that are ubiquitous in biological environments. Here we demonstrate the impact of fluid inertia. We analyze the dynamics of a microswimmer in pressure-driven Poiseuille flow, where fluid inertia is small but non-negligible. Using perturbation theory and the reciprocal theorem, we show that in addition to the classical inertial lift of passive particles, the active nature generates a ‘swimming lift’, which we evaluate for neutral and pusher/puller-type swimmers. Accounting for fluid inertia engenders a rich spectrum of complex dynamics including bistable states, where tumbling coexists with stable centerline swimming or swinging. The dynamics is sensitive to the swimmer’s hydrodynamic signature and goes well beyond the findings at vanishing fluid inertia. Our work will have non-trivial implications on the transport and dispersion of active suspensions in microchannels.

Funder

Alexander von Humboldt-Stiftung

Deutsche Forschungsgemeinschaft

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy

Cited by 13 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Active particle motion in Poiseuille flow through rectangular channels;Physical Review E;2024-09-05

2. Ciliary propulsion through non-uniform flows;Journal of Fluid Mechanics;2024-05-02

3. Investigating Poiseuille Flows in Rotating Inclined Pipes: An Analytical Approach;International Journal of Heat and Technology;2024-02-29

4. Jeffery’s Orbits and Microswimmers in Flows: A Theoretical Review;Journal of the Physical Society of Japan;2023-06-15

5. Lattice Boltzmann Simulations of Two Linear Microswimmers Using the Immersed Boundary Method;Communications in Computational Physics;2023-06

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