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UID:0-515@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150701T163000

DTEND;TZID=Asia/Jerusalem:20150701T173000

DTSTAMP:20230603T192730Z

URL:https://aerospace.technion.ac.il/events/experimental-study-of-unsteady
 -aerodynamics-during-flapping-flight-of-birds/

SUMMARY:Experimental Study of Unsteady Aerodynamics during Flapping Flight 
 of Birds
DESCRIPTION:Lecturer:Roi Gurka\n Faculty:School of Coastal and Marine Syste
 ms Science\n Institute:Coastal Carolina University\, SC\, USA\n Location:C
 lassroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract
 : \n Details: \n Case Study: Starling\, Sandpiper and Robin\nBirds’ uniq
 ue characteristics such as wing shape\, flexibility\, feathers\, and flapp
 ing motion\, result in high aerodynamic performance. Flapping flight mode 
 is common in low Reynolds number flyers and the contribution of unsteady e
 ffects to lift and drag is not entirely understood. To gain insight about 
 the unsteady contribution\, a controlled study in an avian wind tunnel on 
 the near wake flow behind freely flying birds was performed. Long duration
 \, time resolved particle image velocimetry (PIV)\, combined with high spe
 ed imaging has been used to characterize the various flow features at the 
 bird’s wake that are associated with flapping flight. Time series of the
  velocity and the vorticity fields have been expressed as composite wake p
 lots\, which reveal various characteristics of the wake during the upstrok
 e (US) and downstroke (DS) phases of the flapping mode as well as the tran
 sition between US to DS and vice versa. Unsteady drag and lift components 
 have been estimated over these wingbeat cycles\, demonstrating how the bir
 d manifests its aerodynamic performance through the kinematics of the wing
 s. Comparison between the near wake fields of the three birds shows remark
 able similarity in their wake structure. We have identified the presence o
 f what appears to be an overlap of two distinct patterns during the transi
 tion from US to DS. Over these regions\, the majority of net positive circ
 ulation is accumulated\, which indicates that this overlap may be a key fe
 ature in producing lift\, and thus contribute to the observed high aerodyn
 amic performance.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20150327T030000

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