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Dense, elastic microswimmers can achieve passive locomotion in oscillating fluid flows, breaking symmetry indirectly. This research explores microswimmer control via fluid actuation for applications in robotics and cell manipulation.

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Area of Science:

  • Fluid dynamics
  • Microscale physics
  • Biophysics

Background:

  • Purcell's scallop theorem states reciprocal motion cannot cause locomotion at low Reynolds numbers.
  • Traditional microswimmer locomotion relies on direct control of shape kinematics.
  • Indirect control of microswimmers via fluid actuation is less understood.

Purpose of the Study:

  • To investigate indirect actuation strategies for microswimmer locomotion.
  • To analyze a Λ-shaped model system deforming passively in oscillatory flows.
  • To demonstrate passive locomotion using flow oscillations.

Main Methods:

  • Analysis of a Λ-shaped model system.
  • Simulations of dense, elastic scallops in zero-mean oscillatory flows.
  • Examination of swimming efficiency and motion stability.

Main Results:

  • Neutrally buoyant scallops showed no net locomotion.
  • Dense, elastic scallops exhibited passive locomotion in oscillatory flows.
  • Observed transitions from stable to unstable swimming, including chaoticlike motions and tumbling.

Conclusions:

  • Flow oscillations can passively actuate and control microswimmer motion.
  • This indirect actuation method offers new possibilities for microswimmer design.
  • Potential applications include surgical robots and microfluidic cell sorting.