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Updated: Aug 22, 2025
06:50
Preparation and 3D Tracking of Catalytic Swimming Devices
Published on: July 1, 2016
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Fine-tuning near-boundary swimming equilibria using asymmetric kinematics
Leo Liu1, Qiang Zhong2, Tianjun Han3
1Mechanical & Aerospace Engineering, University of Virginia, Charlottesville, VA 22904, United States of America.
Bioinspiration & Biomimetics
|November 8, 2022
Summary
Bio-inspired propulsors near boundaries adjust their distance. Asymmetric swimming kinematics, like bias angle or stroke-speed ratio, alter these equilibria, enabling fine-tuned control for efficient propulsion.
Area of Science:
- Fluid dynamics
- Bio-inspired robotics
- Biomechanics
Background:
- Bio-inspired propulsors naturally maintain equilibrium distances from solid boundaries.
- The impact of asymmetric swimming kinematics on these near-boundary equilibria is not well understood.
Purpose of the Study:
- To investigate how asymmetric pitch kinematics influence the near-boundary equilibrium of pitching hydrofoils.
- To determine the effects of spatial and temporal asymmetries on hydrofoil positioning relative to a boundary.
Main Methods:
- Conducted water channel experiments with pitching hydrofoils.
- Utilized potential flow simulations to model hydrofoil dynamics.
Main Results:
- Asymmetric pitch kinematics significantly affect near-boundary equilibria.
- Spatial asymmetry (bias angle) and temporal asymmetry (stroke-speed ratio) cause shifts in equilibrium distance.
- Shifting equilibrium closer to the boundary can increase thrust without reducing propulsive efficiency.
Conclusions:
- Asymmetric kinematics offer a method to fine-tune hydrofoil interactions with boundaries.
- This research provides insights into how aquatic and avian species utilize asymmetries for near-surface or near-wall locomotion.
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