Issue 17, 2025

Dynamics of a spheroidal squirmer interacting with a cylindrical obstacle

Abstract

Microorganisms or man-made microswimmers swimming near obstacles have been investigated intensively owing to their importance in biology, physiology, and biomedical engineering. In this work, a direct-forcing fictitious domain method is employed to numerically investigate the interaction between a prolate microorganism (modeled as a squirmer) and a cylindrical obstacle. We report four distinct types of swimming trajectories-forward orbiting, backward orbiting, hovering, and scattering depending on swimmer's aspect ratio. The results illustrate that strong pushers prefer a forward orbit with a low obstacle curvature and a high aspect ratio, while a backward orbit is favored for small aspect ratios. But spheroidal pullers generally scatter off the obstacle. We observe a ‘hovering’ mode between the backward orbiting and scattering mode for both spherical and spheroidal pushers. Our findings highlight a transition in swimming modes influenced by the geometry and dipolarity of the microswimmer.

Graphical abstract: Dynamics of a spheroidal squirmer interacting with a cylindrical obstacle

Transparent peer review

To support increased transparency, we offer authors the option to publish the peer review history alongside their article.

View this article’s peer review history

Article information

Article type
Paper
Submitted
18 Feb 2025
Accepted
23 Mar 2025
First published
24 Mar 2025

Soft Matter, 2025,21, 3267-3277

Dynamics of a spheroidal squirmer interacting with a cylindrical obstacle

Y. Xia, Z. Yu, J. Lin, Z. Lin and X. Hu, Soft Matter, 2025, 21, 3267 DOI: 10.1039/D5SM00172B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements