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Propulsion velocity of a flapping wing at low Reynolds number

Title
Propulsion velocity of a flapping wing at low Reynolds number
Author
이상환
Keywords
Fruit fly; Propulsion velocity; Flapping wing; Fluid structure interaction; Lattice Boltzmann; Immersed boundary
Issue Date
2015-04
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Citation
JOURNAL OF FLUIDS AND STRUCTURES, v. 54, Page. 422-439
Abstract
This paper presents a computational fluid-structure interaction analysis for free movements with a flapping wing in a quiescent fluid. We demonstrated the moving velocity of a flapping wing according to the phase difference between the angle of attack and the positional angle in the case of a fruit fly with a Reynolds number of 136. If we considered the moving velocity of the flapping wing, the physics were different from that of hovering flight of previous studies, which did not consider the propulsive velocity and presented the advanced rotation of the angle of attack as the best mechanism for propulsion force, as compared to symmetric rotation and delayed rotation. We found that symmetric rotation produced a better propulsion velocity with less fluctuation in other direction than the advanced rotation. The hairpin vortex generated at the end of a stroke did not clearly contribute to the enhancement of propulsion; the wake capture is considered to be one of the main enhancements of the advanced rotation in a previous studies. We studied the effects of the angle of attack to determine why the fruit fly uses a large angle of attack during a constant angle of attack period. Larger angles of attack produced greater propulsion velocities. Further, larger angles of attack did not generate greater peal< force during the rotation of the angle of attack at the reversal of stroke, but they produced less fluctuation at the reversal of the stroke and greater force during the constant angle of attack period. (C) 2015 Published by Elsevier Ltd.
URI
http://www.sciencedirect.com/science/article/pii/S0889974614002692http://hdl.handle.net/20.500.11754/23883
ISSN
0889-9746
DOI
10.1016/j.jfluidstructs.2014.12.002
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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