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SUMMARY:Locomotion of helical bodies in viscoelastic fluids - Spagnolie\, 
 S (University of Wisconsin-Madison)
DTSTART:20130625T084500Z
DTEND:20130625T093000Z
UID:TALK45904@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Many microorganisms swim by rotating one or many helical flage
 lla\, often propelling themselves through fluids that exhibit both viscous
  and elastic qualities in response to deformations. In an effort to better
  understand the complex interaction between the fluid and body in such sys
 tems\, we have studied numerically the force-free swimming of a rotating h
 elix in a viscoelastic (Oldroyd-B) fluid. The introduction of viscoelastic
 ity can either enhance or retard the swimming speed depending on the body 
 geometry and the properties of the fluid (through a dimensionless Deborah 
 number). The numerical results show how small-amplitude theoretical calcul
 ations connect smoothly to large-amplitude experimental measurements.\n\nC
 o-authors: Bin Liu (Brown University)\, Thomas R. Powers (Brown University
 )\n
LOCATION:Seminar Room 1\, Newton Institute
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