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      Wake structure and thrust generation of a flapping foil in two-dimensional flow

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      Journal of Fluid Mechanics
      Cambridge University Press (CUP)

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          Abstract

          We present a combined numerical (particle vortex method) and experimental (soap film tunnel) study of a symmetric foil undergoing prescribed oscillations in a two-dimensional free stream. We explore pure pitching and pure heaving, and contrast these two generic types of kinematics. We compare measurements and simulations when the foil is forced with pitching oscillations, and we find a close correspondence between flow visualisations using thickness variations in the soap film and the numerically determined vortex structures. Numerically, we determine wake maps spanned by oscillation frequency and amplitude, and we find qualitatively similar maps for pitching and heaving. We determine the drag–thrust transition for both pitching and heaving numerically, and we discuss it in relation to changes in wake structure. For heaving with low oscillation frequency and high amplitude, we find that the drag–thrust transition occurs in a parameter region with wakes in which two vortex pairs are formed per oscillation period, in contrast to the common transition scenario in regions with inverted von Kármán wakes.

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          • Record: found
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          Review of fish swimming modes for aquatic locomotion

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            • Record: found
            • Abstract: not found
            • Article: not found

            Hydrodynamics of Fishlike Swimming

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              • Record: found
              • Abstract: not found
              • Article: not found

              Vortex formation in the wake of an oscillating cylinder

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                Author and article information

                Journal
                Journal of Fluid Mechanics
                J. Fluid Mech.
                Cambridge University Press (CUP)
                0022-1120
                1469-7645
                February 10 2017
                December 28 2016
                February 10 2017
                : 812
                Article
                10.1017/jfm.2016.808
                4755203b-b978-4507-85be-8aab797f0a5f
                © 2017

                https://www.cambridge.org/core/terms


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