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On a mechanism of near-wall reverse flow formation in a turbulent duct flow

Published online by Cambridge University Press:  28 July 2021

Dinar Zaripov Open the ORCID record for Dinar Zaripov [Opens in a new window] ,
Vladislav Ivashchenko ,
Rustam Mullyadzhanov Open the ORCID record for Rustam Mullyadzhanov [Opens in a new window] ,
Renfu Li ,
Nikolay Mikheev  and
Christian J. Kähler
Dinar Zaripov*
Affiliation:
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, PR China Institute of Thermophysics SB RAS, Lavrentyev ave. 1, 630090Novosibirsk, Russia
Vladislav Ivashchenko
Affiliation:
Institute of Thermophysics SB RAS, Lavrentyev ave. 1, 630090Novosibirsk, Russia Novosibirsk State University, Pirogov str. 1, 630090Novosibirsk, Russia
Rustam Mullyadzhanov
Affiliation:
Institute of Thermophysics SB RAS, Lavrentyev ave. 1, 630090Novosibirsk, Russia Novosibirsk State University, Pirogov str. 1, 630090Novosibirsk, Russia
Renfu Li*
Affiliation:
School of Aerospace Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, PR China
Nikolay Mikheev
Affiliation:
Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences, Lobachevskiy str. 2/31, 420111Kazan, Russia
Christian J. Kähler
Affiliation:
Institute of Fluid Mechanics and Aerodynamics, Bundeswehr University Munich, Werner-Heisenberg-Weg 39, 85577Neubiberg, Germany
*
†Email addresses for correspondence: [email protected], [email protected]
†Email addresses for correspondence: [email protected], [email protected]
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Abstract

We address the issue of the generation mechanism of near-wall reverse flow (NWRF) events in a fully developed turbulent duct flow using direct numerical simulations and particle image velocimetry at a relatively low Reynolds number $Re_\tau \simeq 200$. The analysis demonstrates the existence of a large-scale high-momentum flow structure originating upstream of a NWRF region. We propose a conceptual model of the NWRF formation and suggest that they are caused by intensive hairpin vortices incipient at the interface between large-scale high- and low-momentum flow regions identified using a conditional averaging procedure. The similarity of a flow topology associated with the NWRF region for $Re_\tau \simeq 200$ with those for $Re_\tau \simeq 1000$ (Chin et al., Phys. Rev. Fluids, vol. 3, issue 11, 2018, p. 114607) and $550 \leqslant Re_\tau \leqslant 2000$ (Cardesa et al., J. Fluid Mech., vol. 880, 2019) indicates the generality of the proposed mechanism.

JFM classification

Boundary Layers: Boundary layer structure Turbulent Flows: Turbulent boundary layers Turbulent Flows: Shear layer turbulence
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 923 , 25 September 2021 , A20
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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