Author(s)

R. Ramamurti, R. Lohner & W. Sandberg

Abstract

Computation of the unsteady flow past a tuna with caudal fin oscillation R. Ramamurti," R. L6hner,*> W. Sandberg* "Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington DC 20375, USA ^Institute for Computational Sciences and Informatics, The George , K4 220% Introduction The graceful motions of swimming fish, which appear almost effortless, have fascinated people for thousands of years, dating at least back to Aristotle, and possibly earlier, according to Lindsey [1]. In recent years, since the early 1970's, there has been increased experimental and analytical investigation of the physiology, biomechanics, and hydrodynamics of fish propulsion, for the purposes of quantifying the energy budget and actual swimming speeds for a variety of fish propulsive modes. These modes were classified by Breder [2] in 1926 and characterized steady forward swimming according to the oc- currence and extent of body undulations, fin oscilla

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