What question did this study set out to answer?

Determine the optimal transverse oscillatory body movements that allow slender fish to achieve high Froude propulsive efficiency.

October 1, 1960Journal of Fluid Mechanics

Note on the swimming of slender fish

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Authors

MLM. J. LighthillUniversity of London

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Implication

Theoretical hydrodynamic modeling demonstrates optimal oscillatory kinematics in slender fish, indicating conditions that maximize Froude propulsive efficiency while minimizing recoil.

Key Points

Determine the optimal transverse oscillatory body movements that allow slender fish to achieve high Froude propulsive efficiency.
Applied slender-body theory for deformable bodies to analyze the hydrodynamics of undulatory fish swimming.
Formulated energy and thrust balance equations evaluating forward swimming velocity, frictional drag, and vortex wake energy loss.
High propulsive efficiency requires transmitting a transverse body wave at approximately 5/4 (1.25 times) the forward swimming speed.
Oscillation amplitude must increase from zero at the anterior body portion to a maximum at the tail, provided the tail span exceeds a critical minimum value.
Waveforms must feature both positive and negative phases to effectively minimize unwanted angular recoil during locomotion.

Cite This Study

M. J. Lighthill (1960) studied this question.

synapsesocial.com/papers/69dd547880eea7d3f699b867 https://doi.org/10.1017/s0022112060001110

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Implication

Theoretical hydrodynamic modeling demonstrates optimal oscillatory kinematics in slender fish, indicating conditions that maximize Froude propulsive efficiency while minimizing recoil.

Note on the swimming of slender fish

Discussion

Member takes

Implication

Key Points

Cite This Study

Note on the swimming of slender fish

Discussion

Member takes

Implication

Key Points

Cite This Study

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