Asynchronous oscillations of rigid rods drive viscous fluid to swirl

Hayashi, Rintaro; Takagi, Daisuke

doi:10.1103/physrevfluids.2.124101

Cited by 1 publication

(1 citation statement)

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“…A common strategy adopted by microscopic organisms is to rely on many flexible flagella and cilia beating collectively in a metachronal rhythm [15,16], though other organisms such as larval copepods have relatively stiff and smaller number of appendages. Our previous experiments showed that two rigid arms are sufficient for generating flow, provided that there is a phase difference between the oscillating arms [17]. However, the arms were fixed in place and not mobile.…”

Section: Introductionmentioning

confidence: 99%

Metachronal Swimming with Rigid Arms near Boundaries

Hayashi

Takagi

2020

Fluids

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Various organisms such as crustaceans use their appendages for locomotion. If they are close to a confining boundary then viscous as opposed to inertial effects can play a central role in governing the dynamics. To study the minimal ingredients needed for swimming without inertia, we built an experimental system featuring a robot equipped with a pair of rigid slender arms with negligible inertia. Our results show that directing the arms to oscillate about the same time-averaged orientation produces no net displacement of the robot each cycle, regardless of any phase delay between the oscillating arms. The robot is able to swim if the arms oscillate asynchronously around distinct orientations. The measured displacement over time matches well with a mathematical model based on slender-body theory for Stokes flow. Near a confining boundary, the robot with no net displacement every cycle showed similar behavior, while the swimming robot increased in speed closer to the boundary.

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Section: Introductionmentioning

confidence: 99%