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UID:6153@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20220209T160000
DTEND;TZID=Europe/Paris:20220209T170000
DTSTAMP:20241120T200923Z
URL:https://www.i2m.univ-amu.fr/evenements/sharks-and-butterflies-micro-si
 zed-surfaces-for-flow-control/
SUMMARY:Amy LANG (University of Alabama\, Tuscaloosa\, USA): Sharks and But
 terflies: Micro-Sized Surfaces for Flow Control
DESCRIPTION:Amy LANG: Sharks and butterflies swim and fly in different flow
  regimes\, yet the structure of their surfaces interacting with the surrou
 nding fluid appear to both contain very important microscopic features tha
 t lead to reduced drag and increased flying or swimming efficiency. Sharks
  have moveable scales (on the order of 200 microns in size) that have been
  demonstrated to act as a passive\, flow-actuated dynamic roughness for se
 paration control. Water tunnel experiments with real shortfin mako shark s
 kin samples mounted to models have shown significant control of flow separ
 ation in both laminar and turbulent boundary layer scenarios. Alternativel
 y\, butterfly scales (100 microns in size covering the wings in a roof shi
 ngle pattern) appear to fundamentally alter the local skin friction drag d
 epending on flow orientation for what is dominantly a laminar boundary lay
 er interacting with the wings. However\, in this case the surface may also
  slow the growth and formation of the leading-edge vortex and these effect
 s shown in experiments may help explain a mean decrease in climbing effici
 ency (joules per flap) of 32.2% for live butterflies once their scales wer
 e removed. An overview of these results will be presented bringing out the
  importance of finding solutions in nature for important engineering probl
 ems.\nIOSSB Seminar
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 021/12/Amy_Lang.jpg
CATEGORIES:Interdisciplinary online seminar series on
 Biolocomotion,Virtual event
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