On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry

Olivier Cadot; Maha Almarzooqi; Antoine Legeai; Vladimir Parezanović; Luc Pastur

doi:10.5802/crmeca.32

Turbulence

On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry

Olivier Cadot ¹ ; Maha Almarzooqi ^2,¹ ; Antoine Legeai ^3,¹ ; Vladimir Parezanović ² ; Luc Pastur ³

¹ School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
² Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, UAE
³ IMSIA-ENSTA ParisTech, 828 Bd des Maréchaux F-91762 Palaiseau, France

Comptes Rendus. Mécanique, Volume 348 (2020) no. 6-7, pp. 509-517.

Résumé

The paper reports on the bi-stable turbulent wake dynamics of a three-dimensional bluff body. It is shown that the occurrence of the switching between the two wake states decreases as the turbulent intensity of the incoming flow is made larger by an additional upstream grid. A detailed analysis of the jumps statistics indicates that the turbulent fluctuation of each wake state is also decreased. It is concluded that the states switching is thus triggered by large fluctuations produced by the wake instabilities and not by those of the incoming flow. It is also shown that increasing the free-stream turbulence intensity reinforces the permanent asymmetry of each state and increases the wake sensitivity to residual asymmetries.

Publié le : 2020-11-16

DOI : 10.5802/crmeca.32

Mots clés : Turbulence, Instability, Wake, Asymmetry, Reversals, Aerodynamics, Analogy

Affiliations des auteurs :

Olivier Cadot ¹ ; Maha Almarzooqi ^{2, 1} ; Antoine Legeai ^{3, 1} ; Vladimir Parezanović ² ; Luc Pastur ³

¹ School of Engineering, University of Liverpool, Liverpool L69 3GH, UK
² Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, UAE
³ IMSIA-ENSTA ParisTech, 828 Bd des Maréchaux F-91762 Palaiseau, France

Licence :

CC-BY 4.0

Droits d'auteur : Les auteurs conservent leurs droits

@article{CRMECA_2020__348_6-7_509_0,
     author = {Olivier Cadot and Maha Almarzooqi and Antoine Legeai and Vladimir Parezanovi\'c and Luc Pastur},
     title = {On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {509--517},
     publisher = {Acad\'emie des sciences, Paris},
     volume = {348},
     number = {6-7},
     year = {2020},
     doi = {10.5802/crmeca.32},
     language = {en},
}

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JO  - Comptes Rendus. Mécanique
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PB  - Académie des sciences, Paris
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%A Maha Almarzooqi
%A Antoine Legeai
%A Vladimir Parezanović
%A Luc Pastur
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%J Comptes Rendus. Mécanique
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%I Académie des sciences, Paris
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Olivier Cadot; Maha Almarzooqi; Antoine Legeai; Vladimir Parezanović; Luc Pastur. On three-dimensional bluff body wake symmetry breaking with free-stream turbulence and residual asymmetry. Comptes Rendus. Mécanique, Volume 348 (2020) no. 6-7, pp. 509-517. doi : 10.5802/crmeca.32. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.32/

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