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Self-selection of flow instabilities by acoustic perturbations around rectangular cylinder in cross-flow

Published online by Cambridge University Press:  04 November 2024

Atef Mohany Open the ORCID record for Atef Mohany [Opens in a new window] ,
Ahmed Shoukry Open the ORCID record for Ahmed Shoukry [Opens in a new window]  and
Luc Pastur Open the ORCID record for Luc Pastur [Opens in a new window]
Atef Mohany
Affiliation:
Ontario Tech University, Oshawa, ON L1H 4X8, Canada
Ahmed Shoukry
Affiliation:
Ontario Tech University, Oshawa, ON L1H 4X8, Canada
Luc Pastur*
Affiliation:
Fluid Mechanics Department, ENSTA Paris, Institut Polytechnique de Paris, F-91120 Palaiseau, France
*
†Email address for correspondence: [email protected]
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Abstract

This work experimentally investigates the flow structure around a rectangular cylinder with an aspect ratio of 2 under varying incidence angles to examine how acoustic perturbations modify and modulate the unsteady flow instabilities. In the absence of acoustic excitation, the angle of incidence is found to markedly influence the flow topology and the natural shedding pattern altering the vortex formation length and wake dynamics. With acoustic perturbations, it is observed that for incidence angles $\alpha = 0^{\circ }$ and $\alpha = 5^{\circ }$, the masked impinging leading-edge vortex (ILEV)/trailing-edge vortex shedding (TEVS) instability modes of $n= 1$ and $n= 2$ become evident when their frequencies coincide with the frequencies of the acoustic perturbations (i.e. resonant condition). Both trailing-edge and leading-edge vortices were found to be modulated by the acoustic pressure cycle. These instability modes, which are naturally present under non-resonant conditions for significantly higher aspect ratios, highlight the role of incidence angle and self-excited acoustic resonance in virtually augmenting the streamwise length of the cylinder, thereby facilitating the emergence and sustenance of the ILEV/TEVS shedding pattern.

JFM classification

Acoustics: Aeroacoustics Wakes/Jets: Wakes Wakes/Jets: Vortex streets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 998 , 10 November 2024 , A51
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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