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Caltech

GALCIT Colloquium

Friday, February 21, 2014
3:00pm to 4:00pm
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Guggenheim 133 (Lees-Kubota Lecture Hall)
Sharks and Butterflies: Micro-Sized Scales Have Macro Effects
Amy Lang, Associate Professor, Aerospace Engineering and Mechanics, University of Alabama,

Sharks and butterflies swim and fly in two completely different flow regimes, yet the structure of their surfaces interacting with the surrounding fluid look amazingly similar. Both are not smooth but have unique microgeometries that potentially work to control the flow.  Sharks have moveable scales that appear to act as a passive, flow-actuated dynamic roughness for separation control.  Alternatively, butterfly scales appear to fundamentally alter the local skin friction drag depending on flow orientation.

For more information, please contact Charles (Stan) Wojnar by phone at 626-395-5760 or by email at [email protected].