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Motion of a single microalga with one defective flagellum

Published online by Cambridge University Press:  14 May 2025

Zhenyu Ouyang ,
Chen Liu Open the ORCID record for Chen Liu [Opens in a new window] ,
Jianzhong Lin Open the ORCID record for Jianzhong Lin [Opens in a new window] ,
Fubing Bao  and
Chengxu Tu
Zhenyu Ouyang
Affiliation:
Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education, 315201 Ningbo, PR China
Chen Liu
Affiliation:
Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education, 315201 Ningbo, PR China
Jianzhong Lin*
Affiliation:
Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education, 315201 Ningbo, PR China Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, 310027 Hangzhou, PR China
Fubing Bao
Affiliation:
Zhejiang Province Key Laboratory of Flow Measurement Technology, China Jiliang University, 310018 Hangzhou, PR China
Chengxu Tu
Affiliation:
Zhejiang Province Key Laboratory of Flow Measurement Technology, China Jiliang University, 310018 Hangzhou, PR China
*
Corresponding author: Jianzhong Lin, mecjzlin@public.zju.edu.cn
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Abstract

We experimentally identify a rotational motion of a single microalga (Chlamydomonas reinhardtii) within a microcontainer believed to be induced by one defective flagellum. We numerically adapt the classic two-dimensional squirmer model to replicate this unique motion by partially inhibiting the slip velocity on the boundaries of the squirmer. Subsequently, we employ a lattice Boltzmann method to simulate the motion of the single microalga with one defective flagellum. We examine the influence of swimming Reynolds numbers, self-propelling strength ($\beta$) and angle ($\alpha$) on the locomotion of the squirmer with one defective flagellum. The results indicate that a large $\beta$ leads to a large rotational diameter, positively correlating with the speed. Additionally, we observe that a low self-propelling strength ($\beta =0.5$) yields a monotonically increasing speed for the squirmer with $\alpha$. In general, high $\beta$ values result in fast speeds for the squirmer. This differs from the behaviour observed in a classic squirmer ($\alpha =360^{\circ }$), where high $\beta$ leads to a slow speed of puller ($\beta \gt 0$) owing to weak fluid inertia effects. Meanwhile, the energy expenditure increases monotonically with $\alpha$, contrasting with the non-monotonic trends observed for swimming speed and rotational diameter.

JFM classification

Biological Fluid Dynamics: Micro-organism dynamics Multiphase and Particle-laden Flows: Multiphase flow Complex Fluids: Active matter
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1010 , 10 May 2025 , A20
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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Footnotes

†

Zhenyu Ouyang and Chen Liu contributed equally to this work.

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Supplementary material: File

Ouyang et al. supplementary material movie 1

The rotational movement of a single Chlamydomonas in a circular microcontainer.
Download Ouyang et al. supplementary material movie 1(File)
File 23.3 MB
Supplementary material: File

Ouyang et al. supplementary material movie 2

The detailed diagram of Chlamydomonas rotation with one defective flagellum.
Download Ouyang et al. supplementary material movie 2(File)
File 48.1 MB