סמינר מחלקתי ביה"ס להנדסה מכאנית Prof. Gil Yosilevskii

20 במרץ 2017, 14:00 
 
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סמינר מחלקתי ביה"ס להנדסה מכאנית Prof. Gil Yosilevskii

 

 

 

 

School of Mechanical Engineering Seminar
Monday, March 20, 2017 at 14:00
Wolfson Building of Mechanical Engineering, Room 206

 

 

HYDRODYNAMICS OF A SWIMMING EEL

 

Prof. Gil Yosilevskii 

                             Technion Fac. Aero & Space   

 

 

 

 

 

  Eels swim by generating short lateral displacement waves that propagate backwards along the body of the fish faster than it swims. Hydrodynamic theory of elongated swimmers predicts that if the amplitude of the displacement waves does not increase toward the tail, the part of the fish behind of its widest point takes no part in propulsion. It also predicts that if the amplitude does increase toward the tail, then the hydrodynamic propulsion efficiency suffers.

Cusk eels reach their maximal width right behind their heads, and the bulk of their locomotive muscles (myomeres) is located aft of the widest section. Indeed, they swim so that the amplitude of the propulsion wave increases as it propagates along the fish. Does it imply that these fish evolved inefficient swimmers? As compared with cusk eels, true eels have much longer body aft of the widest section and have their locomotive muscles distributed along their entire length - but they swim as cusk eels, using only the tail. Does it imply that these fish deliberately choose an inefficient swimming gait? What is the optimal swimming gait of an eel? Answers to these questions will be given in the talk.

 

 

 

 

 

 

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