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A self-propelling clapping body

Mahulkar, SV and Arakeri, JH (2023) A self-propelling clapping body. In: Journal of Fluid Mechanics, 971 .

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Official URL: https://doi.org/10.1017/jfm.2023.657


We report an experimental study of the motion of a clapping body consisting of two flat plates pivoted at the leading edge by a torsion spring. Clapping motion and forward propulsion of the body are initiated by the sudden release of the plates, initially held apart at an angle. Results are presented for the clapping and forward motions, and for the wake flow field for 24 cases, where depth-to-length ratio , spring stiffness per unit depth , body mass and initial separation angle are varied. The body initially accelerates rapidly forward, then slowly retards to nearly zero velocity. Whereas the acceleration phase involves a complex interaction between plate and fluid motions, the retardation phase is simply fluid dynamic drag slowing the body. The wake consists of either a single axis-switching elliptical vortex loop (for) or multiple vortex loops (for). The body motion is nearly independent of and most affected by variation in and. Using conservation of linear momentum and conversion of spring strain energy into kinetic energy in the fluid and body, we obtain a relation for the translation velocity of the body in terms of the various parameters. Approximately 80 of the initial stored energy is transferred to the fluid, only 20 to the body. The experimentally obtained cost of transport lies between 2 and. © The Author(s), 2023. Published by Cambridge University Press.

Item Type: Journal Article
Publication: Journal of Fluid Mechanics
Publisher: Cambridge University Press
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Acceleration; Kinetic energy; Kinetics; Vortex flow; Wakes, Flat plate; Forward propulsion; Length ratio; Spring stiffness; Sudden release; Swimming/flying; Torsion Springs; Vortex dynamics; Vortex loops; Wake flow field, Strain energy, drag; experimental study; flow field; kinetic energy; swimming; torsion; vortex flow; wake
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 01 Dec 2023 10:20
Last Modified: 01 Dec 2023 10:20
URI: https://eprints.iisc.ac.in/id/eprint/83413

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