Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session A09: Biofluids: High Re Locomotion I
8:00 AM–9:57 AM,
Sunday, November 19, 2023
Room: 140A
Chair: Megan C. Leftwich, George Washington University
Abstract: A09.00007 : Dynamics and propulsive performance of a flexible oscillating foil in a wavy flow
9:18 AM–9:31 AM
Presenter:
Abdur Rehman
(University of Houston)
Authors:
Abdur Rehman
(University of Houston)
Daniel Floryan
(University of Houston)
We have investigated the dynamics and propulsive performance of a thin foil, which serves as a simplified model for swimming or flying organisms. The foil is driven by a periodic heaving motion while being exposed to a wavy freestream. Flexibility is modelled via a torsional spring at the leading edge, and the pitching motion is passive. We employ a linearized thin airfoil model to capture the flow physics.
The kinematic response under applied heaving and wavy forcing is analyzed separately, revealing the dominance of wavy forcing at lower frequencies. The foil exhibits thrust generation despite purely passive kinematics in a wavy stream. The interactions between various time scales in the problem, including convective, elastic, and wave, give rise to unexpected results. Notably, when the freestream and wave speeds coincide, non-circulatory forces vanish, diminishing the expected elastic resonance.
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