Underwater Flight of the Pteropod

Event Details
  • Date/Time:
    • Friday January 31, 2020
      3:00 pm - 4:00 pm
  • Location: Ford Environmental, Science & Technology (ES&T) Building, Rm. L1255, 3pm
  • Phone:
  • URL:
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  • Fee(s):
    Free
  • Extras:
Contact

Emanuele Di Lorenzo

Summaries

Summary Sentence: A seminar by Dr. Donald Webster, Ocean Science and Engineering

Full Summary: No summary paragraph submitted.

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  • Donald Webster Donald Webster
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GA Tech Ocean Science and Engineering Presents Dr. Donald R. Webster, GA Tech School Civil and Environmental Engineering

Underwater Flight of the Pteropod

The swimming characteristics achieved by flapping wings, translating motion, and shell pitching are studied from observations of shelled Antarctic pteropods (aquatic snails nicknamed `sea butterfies'). A portable tomographic particle image velocimetry (tomo-PIV) system was used to study these pteropods (Limacina helicina antarctica) swim with a pair of parapodia (or “wings”) via a unique flapping propulsion mechanism that incorporates similar techniques as observed in small flying insects. 

The swimming velocity is typically 14 – 30 mm/s for pteropod size ranging 1.5 – 5 mm, and the pteropod shell pitches forward-and-backward at 1.9 – 3 Hz. The pitching motion of the shell effectively positions the parapodia such that they flap downwards during both power and recovery strokes. The tomo-PIV measurements reveal the influence of the vortex structure created and shed from the parapodia on the generated lift forces. 

The non-dimensional variables characterizing the motion of swimming pteropods are flapping, translating, and pitching Reynolds numbers (i.e. Ref, ReU, and ReΩ). The observed specimens swim within the same optimal Strouhal number range as observed for a broad range of species in air and water. The complex combination of body kinematics, flow structures, and resulting force balance may be significantly altered by thinning of the pteropod shell, thus making pteropods an indicator of the detrimental effects of ocean acidification.

Webinar Link also available
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Additional Information

In Campus Calendar
Yes
Groups

Ocean Science and Engineering (OSE)

Invited Audience
Faculty/Staff, Postdoc, Graduate students, Undergraduate students
Categories
Seminar/Lecture/Colloquium
Keywords
OSE Seminar
Status
  • Created By: nlawson3
  • Workflow Status: Published
  • Created On: Jan 24, 2020 - 1:26pm
  • Last Updated: Jan 24, 2020 - 2:09pm