Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M19: Biological Fluid Dynamics: Flying Insects
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B306
Chair: Laura Miller, University of North Carolina at Chapel Hill
Abstract ID: BAPS.2018.DFD.M19.7
Abstract: M19.00007 : Three-dimensional flow visualization of hawkmoth wakes in unsteady flow*
9:18 AM–9:31 AM
Presenter:
Megan G Matthews
(Georgia Inst of Tech)
Authors:
Megan G Matthews
(Georgia Inst of Tech)
Simon Sponberg
(Georgia Inst of Tech)
Recent work focuses on how unsteady aerodynamics are affected by unsteady flow. Flapping insects use unsteady flight mechanisms to navigate naturally unsteady environments. Capturing flight aerodynamics at the scale of flapping insects requires high spatial and temporal resolution. High wingbeat frequencies suggest aerodynamics may change on a millisecond timescale and wingspan is on the order of centimeters. In each wingstroke, vortices are produced along the wings and shed into the wake. These 3D flight mechanisms require 3D flow visualization with a behaving animal. We performed 3D particle tracking velocimetry (3D-PTV) on freely flying and tethered hawkmoths downstream of a 3D-printed flower. Within wingbeat time resolution was obtained with a 60mJ/pulse Nd:YLF laser operating at 1kHz. High spatial resolution was achieved in the 90mm x 50 mm x 20mm illuminated volume using micron-sized particles. The flower sheds vortices every 0.2-0.5s, but velocity in the downwash of the moth is the same as in steady flow. In free flight, the downwash is angled more below the animal than during tethered flight. Future work will quantify how flow around the wings changes in unsteady flow.
*This work was supported by an NSF GRFP (DGE-1650044), an NSF CAREER (MPS/PoLS 1554790), and an ARO DURIP.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M19.7
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