Related Experiment Video
Updated: Jul 1, 2026
05:12
Swimming Performance Assessment in Fishes
Published on: May 20, 2011
Tuna-like swimmers experience a fluid-mediated stable side-by-side formation
Pedro Costa Ormonde1,2, Matthew J Stasolla1, Alec Menzer3
1Department of Mechanical Engineering and Mechanics, Lehigh University, Packer Ave., Bethlehem, PA 18015, United States of America.
Bioinspiration & Biomimetics
|June 29, 2026
Summary
Bio-robotic tuna swimmers spontaneously form stable side-by-side schools. A "channeling effect" creates low pressure, ensuring stability and minimal impact on swimming efficiency for robotic and natural fish schools.
Area of Science:
- Fluid dynamics
- Robotics
- Biomimetics
Background:
- Fish schooling behavior is crucial for survival and energy conservation.
- Understanding the hydrodynamic principles behind schooling can inform robotic design.
- Previous studies on schooling foils showed sensitivity to phase synchronization.
Purpose of the Study:
- To investigate the spontaneous formation and stability of side-by-side schooling in bio-robotic swimmers.
- To identify the fluid dynamics mechanisms responsible for stable schooling formations.
- To explore the potential application of these findings to biological fish schools.
Main Methods:
- Free-swimming experiments with 3D bio-robotic swimmers mimicking Yellowfin tuna.
- Computational fluid dynamics (CFD) simulations to analyze flow patterns.
- Analysis of hydrodynamic forces and stability of schooling formations.
Main Results:
- Bio-robotic tuna swimmers spontaneously converged into a stable side-by-side schooling formation.
- A "channeling effect" due to flow constriction between closely spaced swimmers accelerated flow and created a low-pressure zone.
- This low-pressure zone generated a restorative force, ensuring hydrodynamic stability independent of phase synchronization.
Conclusions:
- The channeling effect provides a robust mechanism for stable schooling in bio-robotic swimmers, with minimal impact on swimming speed and energy cost.
- This mechanism may be relevant to the schooling behavior observed in natural tuna populations.
- Bio-robotic schools could potentially maintain formation with reduced active control, inspired by this hydrodynamic principle.
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