Experimental study of the hydrodynamic interaction between a fish and an actively pitching airfoil

Rishita Das; Sean D. Peterson; Maurizio Porfiri

doi:10.1117/12.2658455

27 April 2023 Experimental study of the hydrodynamic interaction between a fish and an actively pitching airfoil

Rishita Das, Sean D. Peterson, Maurizio Porfiri

Proceedings Volume 12481, Bioinspiration, Biomimetics, and Bioreplication XIII; 124810A (2023) https://doi.org/10.1117/12.2658455
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

The phenomenon of fish schooling - coordinated swimming of fish in polarized groups of specific spatial formations - is commonly observed in several species of fish. Fish schooling may even provide hydrodynamic advantages reducing the overall swimming cost of the group. To date, the role of hydrodynamics in coordinated swimming is not completely understood as it is difficult to separately study the role of hydrodynamic interaction from other forms of interaction between the fish. Here, we propose a statistical methodology based on information theoretic tools and flow velocity measurements, that can potentially tease out the hydrodynamic interaction pathways from visual and tactile ones. To avoid experimental confounds from bidirectional interactions and objectively understand cause-and-effect relationships, we design a robotic platform that mimics the behavior of two fish swimming in-line in a controlled setup inside a water channel. We examine the response of a flag to the fish-like unsteady wake generated by an actively pitching airfoil located upstream. We systematically quantify the passive hydrodynamic effect by studying the flapping motion of the flag located downstream of the airfoil in response to both periodic pitching and less predictable, random startling motion of the upstream airfoil. The study integrates experimental biomimetics with information theory to establish a deeper understanding of hydrodynamics in fish schooling.

Conference Presentation

Citation Download Citation

Rishita Das, Sean D. Peterson, and Maurizio Porfiri "Experimental study of the hydrodynamic interaction between a fish and an actively pitching airfoil", Proc. SPIE 12481, Bioinspiration, Biomimetics, and Bioreplication XIII, 124810A (27 April 2023); https://doi.org/10.1117/12.2658455

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