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UID:0-530@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150401T163000

DTEND;TZID=Asia/Jerusalem:20150401T173000

DTSTAMP:20230603T193408Z

URL:https://aerospace.technion.ac.il/events/sea-lion-swimming-and-ship-air
 -wake-research-two-projects-at-the-george-washington-university/

SUMMARY:Sea Lion Swimming and Ship Air Wake Research\, Two Projects at the 
 George Washington University
DESCRIPTION:Lecturer:Dr. Ken Friedman\n Faculty:Department of Mechanical an
 d Aerospace Eng.\,\n Institute:School of Eng. and Applied Sciences\, Georg
 e Washington University\, Washington\, DC\n Location:Classroom 165\, groun
 d floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \n Details: \n Sea
  Lion Swimming:\nThe main objective of this research is to explore a mecha
 nism for underwater propulsion that leaves little traceable wake structur
 e while producing high levels of thrust. A potential  biological model i
 s the California sea lion\, an aquatic mammal that produces thrust primari
 ly using its foreflippers\, unlike most marine swimmers which use caudal 
 fin oscillation. Sea lions use a “clap and glide” method which appear
 s to have no characteristic frequency and thus are expected to generate a
  significantly different wake. In an effort to build a robotic sea lion fl
 ipper for water tunnel experimentation\, flipper kinematics have been qua
 ntified for the first time in both two and three dimensions\, and the fli
 pper’s geometry has been extracted using three non-invasive methods whi
 ch will be briefly compared for their overall quality and level of detail 
 captured.\nShip Air Wake:\nShipboard launch and recovery of naval rotary w
 ing aircraft is vital to several of the Navy’s mission areas\, but is c
 onsidered challenging and potentially dangerous\, often limited by rapidly
  changing flow conditions due to ship motion\, air turbulence created by 
 the ship’s superstructure\, and the dynamic interaction between the ves
 sel’s air wake and the rotor wake. This talk will present comparison be
 tween detailed in situ air wake measurements on a 32.9 m (108 ft) long Na
 vy vessel\, and both wind tunnel and CFD results (with matching Reynolds n
 umbers)\, in an attempt to validate computations for reducing the require
 d flight testing. Preliminary results from in situ dynamic interface expe
 riments will also be presented\, with a scaled RC helicopter producing an
  equivalent rotorcraft wake while mounted on a pole at a representative he
 ight.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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