Aerodynamic characteristics of flapping motion in hover |
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Authors: | D F Kurtulus L David A Farcy N Alemdaroglu |
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Institution: | (1) Laboratoire d’Etudes Aérodynamiques, ENSMA avenue Clément Ader, BP40109, 86961 Futuroscope Chasseneuil, France;(2) Laboratoire d’Etudes Aérodynamiques, SP2MI Université de Poitiers Boulevard Marie et Pierre Curie, BP30179, 86962 Futuroscope Chasseneuil, France;(3) Aerospace Engineering Department, Middle East Technical University, 06531 Ankara, Turkey |
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Abstract: | The aim of the present work is to understand the aerodynamic phenomena and the vortex topology of an unsteady flapping motion
by means of numerical and experimental methods. Instead of the use of real insect/bird wing geometries and kinematics which
are highly complex and difficult to imitate by an exact modeling, a simplified model is used in order to understand the unsteady
aerodynamics and vortex formation mechanisms during the different phases of the flapping motion. The flow is assumed to be
laminar with a Reynolds number of 1,000. Direct numerical simulations, laser sheet visualizations and particle image velocimetry
(PIV) measurements are performed for the phenomenological analysis of the flow. The vortex dynamics and their identification
are put in evidence with PIV measurements by considering velocity magnitude, streamlines, second invariant of velocity gradient
(Q-criteria), vorticity contours and Eurlerian accelerations. |
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Keywords: | |
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