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Efficiency of fish propulsion.

A P Maertens, M S Triantafyllou, D K P Yue

    Bioinspiration & Biomimetics
    |July 31, 2015
    PubMed
    Summary
    This summary is machine-generated.

    We introduce quasi-propulsive efficiency to measure the propulsive fitness of self-propelled flexible bodies like fish. This metric reveals that poor efficiency often stems from complex hydrodynamic interactions, not just friction drag.

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    Area of Science:

    • Fluid Dynamics
    • Biomechanics
    • Robotics

    Background:

    • The efficiency of self-propelled flexible bodies is poorly defined.
    • Existing metrics do not fully capture propulsive performance in aquatic locomotion.

    Purpose of the Study:

    • Introduce and define quasi-propulsive efficiency as a novel metric.
    • Evaluate the propulsive fitness of fish and fish-like mechanisms.
    • Analyze the efficiency of undulating foils with different kinematics.

    Main Methods:

    • Defined quasi-propulsive efficiency: ratio of towing power to self-propulsion power at the same speed.
    • Conducted two-dimensional viscous simulations at a Reynolds number of 5,000.
    • Applied the metric to carangiform and anguilliform undulating foil kinematics.

    Main Results:

    • Quasi-propulsive efficiency serves as a rational, non-dimensional metric for propulsive fitness.
    • Low efficiency in undulating foils is linked to adverse body-propulsor hydrodynamic interactions.
    • Pressure drag, not just friction drag, significantly contributes to thrust and drag at Re=5,000.

    Conclusions:

    • Quasi-propulsive efficiency accurately assesses the propulsive performance of flexible swimmers.
    • Hydrodynamic interactions are critical factors influencing swimming efficiency.
    • The findings have implications for designing efficient biomimetic aquatic robots.