Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D22: Biological Fluid Dynamics: Bird and Insect Wings
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B310
Chair: Roi Gurka, Coastal Carolina University
Abstract ID: BAPS.2018.DFD.D22.1
Abstract: D22.00001 : Aerodynamics of owls during flapping flight; comparative study: great horned owl, tawny owl and boobook owl
2:30 PM–2:43 PM
Presenter:
Roi Gurka
(Coastal Carolina University)
Authors:
Hadar Ben-Gida
(Technion IIT)
Krishnamoorthy Krishnan
(Coastal Carolina University)
Roi Gurka
(Coastal Carolina University)
Owls are known for silent flight during gliding and flapping thanks to their unique wing morphology. However, the current knowledge regarding their aerodynamic capabilities is incomplete. Here, we investigate owl’s aerodynamics; steady and unsteady contributions estimated from near wake flow measurements using long duration time resolved PIV. Three different owl’s species were flown in a wind tunnel in two flight configurations: perch-to-perch and steady flapping flight. Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases during flight. Drag and lift were obtained using the momentum equation for viscous flows and were found to share a highly unsteady behavior. The owls’ aerodynamics appeared to be different when comparing the two different flight modes over the two wingbeat phases. However, similarity was observed during transition phases. When comparing the flight performance of owls to other birds tested in the same facility, we found that the owls generate significantly more drag and less lift during steady flapping flight.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D22.1
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