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UID:0-396@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180131T163000

DTEND;TZID=Asia/Jerusalem:20180131T173000

DTSTAMP:20230527T141130Z

URL:https://aerospace.technion.ac.il/events/hydrodynamic-stability-in-shar
 ks/

SUMMARY:Hydrodynamic Stability in Sharks
DESCRIPTION:Lecturer:Alon Dahan\n Faculty:Department of Aerospace Engineeri
 ng\n Institute:Technion – Israel Institute of Technology\n Location:Clas
 sroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \
 n Details: \n Most sharks are heavier than the water they swim in and ther
 efore must generate hydrodynamic lift to compensate for the lack of buoyan
 cy. To this end\, they can use many possible combinations of fins\, includ
 ing the tail. This multitude of options is responsible for a long-standing
  debate about how the sharks distribute the lift along their body and fins
 .  It also raises a question of stability: are sharks stable?\nIn this st
 udy\, we address both questions using a combined theoretical/numerical/ ex
 perimental approach. We use wind tunnel experiments and CFD simulations to
  construct a hydrodynamic model of the Great Hammerhead shark (Sphyrna mok
 arran). We use this model in a standard ‘flight mechanics’ type analys
 is to assess its dynamic stability and identify its trim options.\nWe show
  that the shark’s body cannot provide the necessary lift by itself and m
 ost of the lift comes from its fins (mostly the pectoral fins) with the ta
 il providing a sizeable (10 to 30%) portion of the lift for balance. We al
 so show that the shark is unstable\, and needs an active control to keep i
 ts trim.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20171029T010000

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