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Hydrodynamics of an oscillating articulated eel-like structure

Apneseth, Claus Christian and Day, Alexander and Clelland, David (2010) Hydrodynamics of an oscillating articulated eel-like structure. Ocean Engineering, 37 (13). pp. 1221-1232. ISSN 0029-8018

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This study examines the hydrodynamic performance of a highly simplified eel-like structure consisting of three articulated segments with the two aft segments oscillating. A physical model was built and tested to determine the forces developed with the model stationary, to find the self-propulsion speed, and to explore the effect on hydrodynamic performance of different swimming patterns. It was found that hydrodynamic performance increases with increasing oscillation frequency; the highest forces when stationary, and the highest self-propulsion speeds were produced by swimming patterns in which the amplitude in the aft segment is larger than that in the forward segment, and in which the motion of the aft segment lags the forward segment. A simple semi-empirical model based on Morison’s equation was implemented to predict the hydrodynamic forces. This was shown to predict mean thrust well in cases in which the aft segment oscillates in phase with the forward segment, but less reliably when the phase difference between the segments increases. Force time histories are generally not well-predicted using this approach. Nonetheless, self-propulsion speeds are predicted within 30% in all cases examined.

Item type: Article
ID code: 29467
Keywords: hydrodynamics, fish locomotion, swimming, model testing, Naval architecture. Shipbuilding. Marine engineering, Ocean Engineering, Environmental Engineering
Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
Department: Faculty of Engineering > Naval Architecture and Marine Engineering
Depositing user: Pure Administrator
Date Deposited: 10 Mar 2011 14:24
Last modified: 24 Jul 2015 10:56

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