A study of 3D flexible caudal fin for fish propulsion

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

6 Citations (Scopus)

Abstract

This paper is inspired by a recent numerical study (Shoele and Zhu, 2012, “Leading edge strengthening and the propulsion performance of flexible ray fins,” Journal of Fluid Mechanics, Vol. 693, pp. 402–432), which shows that, for a 2D flexible ray replicating the pectoral fins of live fish, undergoing a flapping motion in a viscous fluid, the performance can be significantly improved via the flexibility distribution on the rays. In present study, we investigate the propulsion capability of a 3D caudal fin undergoing a flapping motion. The embedded rays are modeled as linear springs and the soft membrane is modeled as a flexible plate being able to deform in span-wise direction. A finite-volume method based Navier-Stokes solver is used to solve the fluid-structure interaction problem. The present paper focuses on the effects of various distributions of the ray and the ray flexibilities, which can lead to different fin deformations. It is shown that the detailed ray distribution has significant influence on the propulsion performance. By distributing fin rays at the tips rather than the middle of fin, a less power expenditure is observed, leading to higher propulsion efficiency. However, larger thrust force is obtained through distributing the rays at the middle, which is attributed to larger effective flapping amplitude. Additionally, ray flexibilities also play a pivotal role in the thrust generation of the fin.
Original languageEnglish
Title of host publicationASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Place of PublicationNew York
Number of pages9
Volume7A
DOIs
Publication statusPublished - 25 Jun 2017
EventASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017 - Trondheim, Norway
Duration: 25 Jun 201730 Jun 2017

Conference

ConferenceASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017
Abbreviated titleOMAE 2017
Country/TerritoryNorway
CityTrondheim
Period25/06/1730/06/17

Keywords

  • propulsion capability
  • 3D caudal fin
  • Navier-Stokes solver
  • propulsion performance

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