Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X06: Biofluids: General Locomotion II
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 102B
Chair: Xuanhong An, San Jose State University
Abstract: X06.00003 : Optimal fluid pumping within confinement by a Giant-Larvacean-inspired undulator*
8:26 AM–8:39 AM
Presenter:
Yicong Fu
(Cornell University)
Authors:
Yicong Fu
(Cornell University)
Sunghwan Jung
(Cornell)
transport (Robison et al 2005; Kajita et al 2017), but their tail undulation for effective fluid pumping and
locomotion is still understudied. Direct observations have found non-uniform flexibilities along the tail
and a recent computational model suggested an optimal tissue activation location for downstream fluid
transport (Hoover et al 2021). To experimentally investigate the benefit of an anguilliform undulator
with flexible trailing edge attachments, we build a robot to parametrically varied the attachment size,
flexural rigidity, undulation speed, fluid channel depth, etc. Preliminary results have shown that fluid
pumping has strong correlations with the tail property and undulation speed and a rather weak
correlation with the fluid channel depth. To further understand the coupling of active undulation and
passive tail movement, Euler-Bernoulli Beam theory is applied to model the kinematics of the propulsor,
whereas volumetric flux, vorticity, and Lagrangian Coherent Structures are examined to understand the
dynamics of the cyclic fluid motion. Dimensionless numbers including Keulegan-Carpenter number,
Reynolds number, and reduced frequency are computed to identify the optimal kinematic and fluid
regimes for pumping effectiveness. Our results are compared with similar modes of flexible flappers
(Quinn et al 2014; Fernandez-Prats et al 2015) for commonalities and differences.
*CMMI-2042740
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