Volume 133, Number 3, February 2021
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||30 March 2021|
Autonomous elastic microswimmer
1 Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University - Tokyo 192-0397, Japan
2 Department of Physics, Graduate School of Science, Tohoku University - Sendai 980-8578, Japan
3 Department of Physics, Graduate School of Science, Chiba University - Chiba 263-8522, Japan
Received: 6 October 2020
Accepted: 15 December 2020
A model of an autonomous three-sphere microswimmer is proposed by implementing a coupling effect between the two natural lengths of an elastic microswimmer. Such a coupling mechanism is motivated by the previous models for synchronization phenomena in coupled oscillator systems. We numerically show that a microswimmer can acquire a nonzero steady state velocity and a finite phase difference between the oscillations in the natural lengths. These velocity and phase differences are almost independent of the initial phase difference. There is a finite range of the coupling parameter for which a microswimmer can have an autonomous directed motion. The stability of the phase difference is investigated both numerically and analytically in order to determine its bifurcation structure.
PACS: 47.63.Gd – Swimming microorganisms / 47.63.mf – Low-Reynolds-number motions / 05.45.Xt – Synchronization; coupled oscillators
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