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Influence of wing kinematics on aerodynamic performance in hovering insect flight

Published online by Cambridge University Press:  14 December 2007

FRANK M. BOS ,
D. LENTINK ,
B. W. VAN OUDHEUSDEN  and
H. BIJL
FRANK M. BOS
Affiliation:
Department of Aerospace Engineering, Delft University of Technology, Kluyverweg 2, PO. Box 5058, Delft, the Netherlandsf.m.bos@tudelft.nl
D. LENTINK
Affiliation:
Department of Aerospace Engineering, Delft University of Technology, Kluyverweg 2, PO. Box 5058, Delft, the Netherlandsf.m.bos@tudelft.nl Wageningen University, Marijkeweg 40, PO. Box 338, Wageningen, the Netherlands
B. W. VAN OUDHEUSDEN
Affiliation:
Department of Aerospace Engineering, Delft University of Technology, Kluyverweg 2, PO. Box 5058, Delft, the Netherlandsf.m.bos@tudelft.nl
H. BIJL
Affiliation:
Department of Aerospace Engineering, Delft University of Technology, Kluyverweg 2, PO. Box 5058, Delft, the Netherlandsf.m.bos@tudelft.nl
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Abstract

The influence of different wing kinematic models on the aerodynamic performance of a hovering insect is investigated by means of two-dimensional time-dependent Navier–Stokes simulations. For this, simplified models are compared with averaged representations of the hovering fruit fly wing kinematics. With increasing complexity, a harmonic model, a Robofly model and two more-realistic fruit fly models are considered, all dynamically scaled at Re = 110. To facilitate the comparison, the parameters of the models were selected such that their mean quasi-steady lift coefficients were matched. Details of the vortex dynamics, as well as the resulting lift and drag forces, were studied.

The simulation results reveal that the fruit fly wing kinematics result in forces that differ significantly from those resulting from the simplified wing kinematic models. In addition, light is shed on the effect of different characteristic features of the insect wing motion. The angle of attack variation used by fruit flies increases aerodynamic performance, whereas the deviation is probably used for levelling the forces over the cycle.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 594 , 10 January 2008 , pp. 341 - 368
Copyright
Copyright © Cambridge University Press 2008

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