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Internal shear layer and vortex shedding development of a structured porous coated cylinder using tomographic particle image velocimetry

Published online by Cambridge University Press:  17 July 2023

E.J.G. Arcondoulis Open the ORCID record for E.J.G. Arcondoulis [Opens in a new window] ,
Y. Liu Open the ORCID record for Y. Liu [Opens in a new window] ,
D. Ragni ,
F. Avallone Open the ORCID record for F. Avallone [Opens in a new window] ,
A. Rubio-Carpio Open the ORCID record for A. Rubio-Carpio [Opens in a new window] ,
N. Sedaghatizadeh ,
Y. Yang Open the ORCID record for Y. Yang [Opens in a new window]  and
Z. Li
E.J.G. Arcondoulis
Affiliation:
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, UK
Y. Liu*
Affiliation:
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China
D. Ragni
Affiliation:
Department of Flow Physics and Technology (FPT), Delft University of Technology, Delft 2629HS, The Netherlands
F. Avallone
Affiliation:
Department of Flow Physics and Technology (FPT), Delft University of Technology, Delft 2629HS, The Netherlands
A. Rubio-Carpio
Affiliation:
Department of Flow Physics and Technology (FPT), Delft University of Technology, Delft 2629HS, The Netherlands
N. Sedaghatizadeh
Affiliation:
School of Electrical and Mechanical Engineering, The University of Adelaide, Adelaide 5005, Australia
Y. Yang
Affiliation:
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Z. Li
Affiliation:
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China
*
†Email address for correspondence: liuy@sustech.edu.cn
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Abstract

Vortex shedding in the wake of a cylinder in uniform flow can be suppressed via the application of a porous coating; however, the suppression mechanism is not fully understood. The internal flow field of a porous coated cylinder (PCC) can provide a deeper understanding of how the flow within the porous medium affects the wake development. A structured PCC (SPCC) was three-dimensionally printed using a transparent material and tested in water tunnel facilities using flow visualisation and tomographic particle image velocimetry at outer-diameter Reynolds numbers of $Re = 7 \times 10^{3}$ and $7.3 \times 10^{4}$, respectively. The internal and near-wall flow fields are analysed at the windward and mid-circumference regions. Flow stagnation is observed in the porous layer on the windward side and its boundary is shown to fluctuate with time in the outermost porous layer. This stagnation region generates a quasi-aerodynamic body that influences boundary layer development on the SPCC inner diameter, that separates into a shear layer within the porous medium. For the first time via experiment, spectral content within the separated shear layer reveals vortex shedding processes emanating through single pores at the outer diameter, providing strong evidence that SPCC vortex shedding originates from the inner diameter. Velocity fluctuations linked to this vortex shedding propagate through the porous layers into the external flow field at a velocity less than that of the free stream. The Strouhal number linked to this velocity accurately predicts the SPCC vortex shedding frequency.

JFM classification

Acoustics: Aeroacoustics Low-Reynolds-number flows: Porous media Vortex Flows: Vortex shedding

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 967 , 25 July 2023 , A17
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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