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Article Dans Une Revue Physical Review Fluids Année : 2023

Intermittent versus continuous swimming: An optimization tale

Résumé

Intermittent swimming, also termed as “burst-and-coast swimming”, has been reported as a strategy for fish to enhance their energetical efficiency. Intermittent swimming involves additional control parameters, which complexifies its understanding by means of quantitative and parametrical analysis, in comparison with continuous swimming. In this study, we used a hybrid computational fluid dynamic (CFD) model to assess the swimming performance in intermittent swimming parametrically and quantitatively. A Navier-Stokes solver is applied to construct a database in the multi-dimensional space of the control parameters to connect the undulation kinematics to swimming performance. Based on the database, an indirect numerical approach named “gait assembly” is used to generate arbitrary burst-and-coast gaits to explore the parameter space. Our simulations directly measured the hydrodynamics and energetics under the unsteady added-mass effect during burst-and-coast swimming. The results suggest that the instantaneous power of burst is basically determined by undulatory kinematics. The results show that the energetical performance of burst-and-coast swimming can be better than that of continuous swimming, but also that an unoptimized burst-and-coast gait may become very energetically expensive. These results shed light on the mechanisms at play in intermittent swimming, enabling us to better understand fish behavior and to propose design guidelines for fish-like robots.
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Dates et versions

hal-04290424 , version 1 (16-11-2023)

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Gen Li, Dmitry Kolomenskiy, Hao Liu, Ramiro Godoy-Diana, Benjamin Thiria. Intermittent versus continuous swimming: An optimization tale. Physical Review Fluids, 2023, 8 (1), pp.013101. ⟨10.1103/PhysRevFluids.8.013101⟩. ⟨hal-04290424⟩
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