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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2016, 37 (5)                                     Back


nstantaneous and historical temperature effects on a-pinene

Hydrodynamic analysis of rigid and flexible pectoral fins

 

Ningyu Li1*, Yumin Su1, Zhaoli Wang2, Weixing Liu1, Muhammad Aqeel Ashraf3 and Zhiyang Zhang4

1Science and Technology on Underwater Vehicle Laboratory, Harbin Engineering University, Harbin-150 001, China

2Beijing Institute of Control Engineering, Beijing-100 190, China

3Faculty of Science and Natural Resources, University Malaysia Sabah-88400 Kota Kinabalu, Sabah, Malaysia

4Deepwater Engineering Research Center, Harbin Engineering University, Harbin-150 001, China

*Corresponding Author E-mail: liningyu123@aliyun.com

 

 Publication Data

Paper received:

21 February 2016

 

Revised received:

27 April 2016

 

Re-revised received:

5 May 2016

 

Accepted:

23 June 2016

 

Abstract

Numerical study on unsteady hydrodynamic characteristics of rigid and flexible pectoral fins in viscous flow-field was performed in the present study. The effect of key kinematical parameters on the propulsion performance was analyzed. The propulsion mechanism was explored by evolution of wake vortices. Computational results revealed that optimal combination for investigated parameters was U = 4C, fFLA = 45o, DfFL = 60o and a0 = 0.2. Wake vortices were shed from two edges of fin and fin tip and convect downstream as well as laterally. For flexible pectoral fin, the shedding time was delayed and shed wake vortices keep longer time near the fin that led to difference in variation amplitude of hydrodynamics as compared to rigid fin. The hydrodynamic performance of flexible fin was superior to that of rigid fin for low incoming velocity. However, the opposite situation occured for high incoming velocity.   

 

 

 Key words

CFD, Flexible body, Hydrodynamics, Pectoral fin, Wake vortex

 

 

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