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      Propulsion Performance of Spanwise Flexible Wing Using Unsteady Panel Method

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          Abstract

          In this paper, the propulsion performance of a spanwise flexible oscillating wing, which is broadly similar to the undulation of a fin fluke, is investigated. The geometry of the fluke underwent three prescribed harmonic oscillating motions simultaneously while surging with constant velocity. The effect of deflection phase angle, flexibility parameter, and wing tip deflection amplitude on thrust coefficient and swimming efficiency was studied. A low-order unsteady panel method coupled with a time stepping algorithm for free wake alignment is implemented in a computer program to estimate the propulsion efficiency of lifting bodies. A novel approach is introduced to evaluate the singular integrals of line vortices by using an adaptive mollifier function. This method is an efficient way to accelerate computational speed by reducing the order of problem from R 3 to body boundaries. Results present the significant effect of phase angle on the propulsion characteristics of oscillating fluke.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          02 May 2020
          01 June 2020
          : 19
          : 3
          : 505-518
          Affiliations
          1Ocean Engineering and Technology Department, Iranian National Institute for Oceanography (INIO), Tehran 1411813389, Iran
          2Marine, Offshore and Subsea Technology, School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
          Author notes
          *Corresponding author: NAJAFI Saeed, E-mail: najafi82@ 123456gmail.com
          Article
          s11802-020-4214-x
          10.1007/s11802-020-4214-x
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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