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Flow past a rotationally oscillating cylinder with an attached flexible filament

Published online by Cambridge University Press:  05 November 2021

Puja Sunil Open the ORCID record for Puja Sunil [Opens in a new window] ,
Sanjay Kumar Open the ORCID record for Sanjay Kumar [Opens in a new window]  and
Kamal Poddar Open the ORCID record for Kamal Poddar [Opens in a new window]
Puja Sunil
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur208016, India
Sanjay Kumar*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur208016, India
Kamal Poddar
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur208016, India
*
†Email address for correspondence: skmr@iitk.ac.in
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Abstract

Experimental studies are conducted on a rotationally oscillating cylinder with an attached flexible filament at a Reynolds number of 150. Parametric studies are carried out to investigate the effect of cylinder forcing parameters and filament stiffness on the resultant wake structure. The diagnostics are flow visualization using the laser-induced fluorescence technique, frequency measurement using a hot film, and characterization of the velocity and vorticity field using planar particle image velocimetry. The streamwise force and power are estimated through control volume analysis, using a modified formulation, which considers the streamwise and transverse velocity fluctuations in the wake. These terms become important in a flow field where asymmetric wakes are observed. An attached filament significantly modifies the flow past a rotationally oscillating cylinder from a Bénard–Kármán vortex street to a reverse Bénard–Kármán vortex street, albeit over a certain range of Strouhal number, $St_{A} \sim 0.25\text {--}0.5$, encountered in nature in flapping flight/fish locomotion and in the flow past pitching airfoils. The transition from a Kármán vortex street to a reverse Kármán vortex street precedes the drag-to-thrust transition. The mechanism of unsteady thrust generation is discussed. Maximum thrust is generated at the instants when vortices are shed in the wake from the filament tip. At $St_{A} > 0.4$, a deflected wake associated with the shedding of an asymmetric vortex street is observed. Filament flexibility delays the formation of an asymmetric wake. Wake symmetry is governed by the time instant at which a vortex pair is shed in the wake from the filament tip.

JFM classification

Vortex Flows: Vortex shedding Wakes/Jets: Separated flows Wakes/Jets: Vortex streets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 930 , 10 January 2022 , A3
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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Sunil et al. supplementary movie 1

An example of tadpole locomotion

Download Sunil et al. supplementary movie 1(Video)
Video 8.5 MB

Sunil et al. supplementary movie 2

Flow past a rotationally oscillating cylinder with and without an attached filament

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Video 10.1 MB

Sunil et al. supplementary movie 3

Formation of a chain of vortices

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Video 9.5 MB

Sunil et al. supplementary movie 4

Transition in the wake structure from a Kármán vortex street to a reverse Kármán vortex street

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Video 55 MB

Sunil et al. supplementary movie 5

Effect of filament stiffness on wake symmetry

Download Sunil et al. supplementary movie 5(Video)
Video 9.9 MB