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• W2734565635 endingPage "056006" @default.
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• W2734565635 abstract "Flight initiation is fundamental for survival, escape from predators and lifting payload from one place to another in biological fliers and can be broadly classified into jumping and non-jumping takeoffs. During jumping takeoffs, the legs generate most of the initial impulse. Whereas the wings generate most of the forces in non-jumping takeoffs, which are usually voluntary, slow, and stable. It is of great interest to understand how these non-jumping takeoffs occur and what strategies insects use to generate large amount of forces required for this highly demanding flight initiation mode. Here, for the first time, we report accurate wing and body kinematics measurements of a damselfly during a non-jumping takeoff. Furthermore, using a high fidelity computational fluid dynamics simulation, we identify the 3D flow features and compute the wing aerodynamics forces to unravel the key mechanisms responsible for generating large flight forces. Our numerical results show that a damselfly generates about three times its body weight during the first half-stroke for liftoff. In generating these forces, the wings flap through a steeply inclined stroke plane with respect to the horizon, slicing through the air at high angles of attack (45°-50°). Consequently, a leading edge vortex (LEV) is formed during both the downstroke and upstroke on all the four wings. The formation of the LEV, however, is inhibited in the subsequent upstrokes following takeoff. Accordingly, we observe a drastic reduction in the magnitude of the aerodynamic force, signifying the importance of LEV in augmenting force production. Our analysis also shows that forewing-hindwing interaction plays a favorable role in enhancing both lift and thrust production during takeoff." @default.
• W2734565635 created "2017-07-21" @default.
• W2734565635 creator A5007724234 @default.
• W2734565635 creator A5067836089 @default.
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• W2734565635 date "2017-09-26" @default.
• W2734565635 modified "2023-10-17" @default.
• W2734565635 title "Aerodynamics and flow features of a damselfly in takeoff flight" @default.
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• W2734565635 doi "https://doi.org/10.1088/1748-3190/aa7f52" @default.
• W2734565635 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28699620" @default.
• W2734565635 hasPublicationYear "2017" @default.
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