A fundamental link between steady asymmetry and separation length in the wake of a 3D square-back body

En Chi Hsu; Luc Pastur; Olivier Cadot; Vladimir Parezanović

doi:10.1007/s00348-021-03201-y

A fundamental link between steady asymmetry and separation length in the wake of a 3D square-back body

En Chi Hsu, Luc Pastur, Olivier Cadot, Vladimir Parezanović

Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Abstract: Suction applied at the base of a square-back Ahmed body is shown to create a global effect on the wake, reducing the recirculating bubble length and increasing the base drag. Weak suction causes a small shortening of the bubble and intensifies the steady reflectional symmetry breaking (RSB) mode present in the horizontal direction. Stronger suction significantly suppresses the RSB mode, indicating that the steady asymmetric instability does not bear a highly curved bubble. The stabilized wake experiences very low frequency oscillations in the horizontal direction together with a well synchronized shedding mode in the vertical direction. Graphic abstract: [Figure not available: see fulltext.].

Original language	British English
Article number	95
Journal	Experiments in Fluids
Volume	62
Issue number	5
DOIs	https://doi.org/10.1007/s00348-021-03201-y
State	Published - May 2021

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title = "A fundamental link between steady asymmetry and separation length in the wake of a 3D square-back body",

abstract = "Abstract: Suction applied at the base of a square-back Ahmed body is shown to create a global effect on the wake, reducing the recirculating bubble length and increasing the base drag. Weak suction causes a small shortening of the bubble and intensifies the steady reflectional symmetry breaking (RSB) mode present in the horizontal direction. Stronger suction significantly suppresses the RSB mode, indicating that the steady asymmetric instability does not bear a highly curved bubble. The stabilized wake experiences very low frequency oscillations in the horizontal direction together with a well synchronized shedding mode in the vertical direction. Graphic abstract: [Figure not available: see fulltext.].",

author = "Hsu, {En Chi} and Luc Pastur and Olivier Cadot and Vladimir Parezanovi{\'c}",

note = "Funding Information: The authors would like to acknowledge the invaluable help of Thierry Pichon in getting the experimental setup operational. This work has been supported by the Khalifa University of Science and Technology under Award No(s). FSU-2018-21 and CIRA-2019-025. Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.",

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AU - Hsu, En Chi

AU - Pastur, Luc

AU - Cadot, Olivier

AU - Parezanović, Vladimir

N1 - Funding Information: The authors would like to acknowledge the invaluable help of Thierry Pichon in getting the experimental setup operational. This work has been supported by the Khalifa University of Science and Technology under Award No(s). FSU-2018-21 and CIRA-2019-025. Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2021/5

Y1 - 2021/5

N2 - Abstract: Suction applied at the base of a square-back Ahmed body is shown to create a global effect on the wake, reducing the recirculating bubble length and increasing the base drag. Weak suction causes a small shortening of the bubble and intensifies the steady reflectional symmetry breaking (RSB) mode present in the horizontal direction. Stronger suction significantly suppresses the RSB mode, indicating that the steady asymmetric instability does not bear a highly curved bubble. The stabilized wake experiences very low frequency oscillations in the horizontal direction together with a well synchronized shedding mode in the vertical direction. Graphic abstract: [Figure not available: see fulltext.].

AB - Abstract: Suction applied at the base of a square-back Ahmed body is shown to create a global effect on the wake, reducing the recirculating bubble length and increasing the base drag. Weak suction causes a small shortening of the bubble and intensifies the steady reflectional symmetry breaking (RSB) mode present in the horizontal direction. Stronger suction significantly suppresses the RSB mode, indicating that the steady asymmetric instability does not bear a highly curved bubble. The stabilized wake experiences very low frequency oscillations in the horizontal direction together with a well synchronized shedding mode in the vertical direction. Graphic abstract: [Figure not available: see fulltext.].

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A fundamental link between steady asymmetry and separation length in the wake of a 3D square-back body

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