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Reorientation dynamics of microswimmers at fluid-fluid interfaces

Harinadha Gidituri, Zaiyi Shen, Alois Würger, and Juho S. Lintuvuori

  • Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France

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Phys. Rev. Fluids 7, L042001 – Published 25 April, 2022Erratum Phys. Rev. Fluids 10, 029902 (2025)

DOI: https://doi.org/10.1103/PhysRevFluids.7.L042001

Abstract

We study the orientational and translational dynamics of spherical microswimmers trapped at fluid interfaces in terms of the force dipole and source dipole components of their flow field. Using numerical simulations and analytical calculations, we show that the force dipole exerts a torque, orienting pushers parallel to the interface and pullers in the normal direction. The source dipole results in particle rotation only for a finite viscosity contrast between the two fluids, in agreement with previous studies. The superposition of these two contributions leads to a rotational dynamics with a steady-state orientation that depends on the relative magnitudes of the force and source dipoles. In the general case, swimmers with weak force dipoles and strong pullers are observed to align perpendicular to the interface and become stationary, while strong pushers have a finite inclination angle toward the lower viscosity fluid and swim along the interface.

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Erratum

Erratum: Reorientation dynamics of microswimmers at fluid-fluid interfaces [Phys. Rev. Fluids 7, L042001 (2022)]

Harinadha Gidituri, Zaiyi Shen, Alois Würger, and Juho S. Lintuvuori
Phys. Rev. Fluids 10, 029902 (2025)

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Outline

Information

Phys. Rev. Fluids 7, L042001– Published 25 April, 2022
  • Received 5 August 2021
  • Accepted 13 April 2022
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