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Aeroacoustics of vortex–wedge interaction

Published online by Cambridge University Press:  22 September 2025

Marios I. Spiropoulos Open the ORCID record for Marios I. Spiropoulos [Opens in a new window] ,
Florent Margnat ,
Vincent Valeau  and
Peter Jordan Open the ORCID record for Peter Jordan [Opens in a new window]
Marios I. Spiropoulos*
Affiliation:
Institute PPRIME UPR, 3346, CNRS – University of Poitiers – ENSMA, 86022 Poitiers, France
Florent Margnat
Affiliation:
Institute PPRIME UPR, 3346, CNRS – University of Poitiers – ENSMA, 86022 Poitiers, France
Vincent Valeau
Affiliation:
Institute PPRIME UPR, 3346, CNRS – University of Poitiers – ENSMA, 86022 Poitiers, France
Peter Jordan
Affiliation:
Institute PPRIME UPR, 3346, CNRS – University of Poitiers – ENSMA, 86022 Poitiers, France
*
Corresponding author: Marios I. Spiropoulos; Email: marios-ioannis.spiropoulos@ensma.fr
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Abstract

We consider the vortex–wedge interaction problem, taking as a departure point Howe’s model of a point vortex interacting with a semi-infinite half-plane, where the vortex path is influenced by its image and a closed-form analytical solution is obtained for the sound field. We generalise Howe’s model to consider wedges of arbitrary angles and explore the influence of vortex circulation, distance from the edge and the wedge half-angle. The effect of wedge angle on sound emission involves a reduced amplitude of the latter as the former is increased. An extension of the model is proposed to account for convection effects by a non-zero ambient flow. We identify a non-dimensional parameter that characterises the vortex kinematics close to the edge and the associated acoustic effect: high and low values of the parameter correspond, respectively, to high- and low-amplitude sound emission of high and low frequency.

JFM classification

Acoustics: Aeroacoustics Acoustics: Hydrodynamic noise Aerodynamics: Flow-structure interactions

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JFM Papers
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Journal of Fluid Mechanics , Volume 1019 , 25 September 2025 , A43
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© The Author(s), 2025. Published by Cambridge University Press

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