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CFD Study on Hydrodynamics of Three Fish-Like Undulating Hydrofoils in Side-by-Side Arrangement

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Fluid Mechanics and Fluid Power – Contemporary Research

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

Propulsive advantage in a three side-by-side (one above the other) arrangement as compared to single/isolated fish-like locomotion of a flexible hydrofoil is studied. A level set based immersed boundary method (LSIBM) is used for a transient 2D CFD simulation and analysis of hydrodynamics of fish like locomotion; modeled here by undulating NACA0012 hydrofoil. The study is undertaken for both antiphase and in-phase undulation (of the middle as compared to side foils) for various frequency (St = 0.4, 0.6 and 0.8) and gap ratios (d = 0.4, 0.6, 0.8 and 1), at a constant amplitude (Amax = 0.1), wavelength (λ = 1) and Reynolds number (Re = 400). Anti-phase as compared to in-phase undulation is found to give better propulsive performance. For side as well as middle hydrofoil, effect of frequency as compared to hydrofoil-spacing is found to be more dominant on the propulsive performance. Signature of thrust is shown with the help of momentum excess and reverse Von-Karman Street.

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Acknowledgment

The present work is part of a research project funded by the Department of Science and Technology, New Delhi under project No. SR/S3/MERC/040/2009; the financial support is acknowledged.

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Correspondence to Atul Sharma .

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Mukul Shrivastava, Malhar Malushte, Amit Agrawal, Atul Sharma (2017). CFD Study on Hydrodynamics of Three Fish-Like Undulating Hydrofoils in Side-by-Side Arrangement. In: Saha, A., Das, D., Srivastava, R., Panigrahi, P., Muralidhar, K. (eds) Fluid Mechanics and Fluid Power – Contemporary Research. Lecture Notes in Mechanical Engineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2743-4_138

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  • DOI: https://doi.org/10.1007/978-81-322-2743-4_138

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  • Publisher Name: Springer, New Delhi

  • Print ISBN: 978-81-322-2741-0

  • Online ISBN: 978-81-322-2743-4

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