In recent years, the near-wall reverse flow (NWRF) phenomenon taking place in wall-bounded turbulent flows has become the subject of comprehensive theoretical and experimental study. Currently, it is generally accepted that the NWRF events are caused by strong near-wall vortical structures located in the buffer region of the boundary layer, which are either quasi-streamwise vortices tilted with respect to a mean flow direction or transversely oriented hairpin-like vortices. In the present investigations, we demonstrate that there is at least one more mechanism that differs from the existing ones. Considering a fully developed turbulent duct flow studied by direct numerical simulations at a relatively low Reynolds number Reτ = 204, we found the presence of the NWRF events in the corner regions. The frequency of their appearance is three orders of magnitude higher than those appearing in the central area of the wall, and their lifetime is about three times longer. The mechanism of their formation is found to be associated with streamwisely oriented vortical structures located near the corner.
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August 2021
Research Article|
August 23 2021
Reverse flow phenomenon in duct corners at a low Reynolds number
Dinar Zaripov
;
Dinar Zaripov
a)
1
School of Mechanical Science and Engineering, Huazhong University of Science and Technology
, Wuhan, China
2
Institute of Thermophysics SB RAS
, Novosibirsk, Russia
a)Authors to whom correspondence should be addressed: zaripov.d.i@gmail.com and renfu.li@hust.edu.cn
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Vladislav Ivashchenko;
Vladislav Ivashchenko
2
Institute of Thermophysics SB RAS
, Novosibirsk, Russia
3
Novosibirsk State University
, Novosibirsk, Russia
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Rustam Mullyadzhanov;
Rustam Mullyadzhanov
2
Institute of Thermophysics SB RAS
, Novosibirsk, Russia
3
Novosibirsk State University
, Novosibirsk, Russia
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Renfu Li (李仁府)
;
Renfu Li (李仁府)
a)
4
School of Aerospace Engineering, Huazhong University of Science and Technology
, Wuhan, China
a)Authors to whom correspondence should be addressed: zaripov.d.i@gmail.com and renfu.li@hust.edu.cn
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Dmitriy Markovich;
Dmitriy Markovich
2
Institute of Thermophysics SB RAS
, Novosibirsk, Russia
3
Novosibirsk State University
, Novosibirsk, Russia
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Christian J. Kähler
Christian J. Kähler
5
Institute of Fluid Mechanics and Aerodynamics, Bundeswehr University Munich
, Neubiberg, Germany
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a)Authors to whom correspondence should be addressed: zaripov.d.i@gmail.com and renfu.li@hust.edu.cn
Physics of Fluids 33, 085130 (2021)
Article history
Received:
May 04 2021
Accepted:
July 31 2021
Citation
Dinar Zaripov, Vladislav Ivashchenko, Rustam Mullyadzhanov, Renfu Li, Dmitriy Markovich, Christian J. Kähler; Reverse flow phenomenon in duct corners at a low Reynolds number. Physics of Fluids 1 August 2021; 33 (8): 085130. https://doi.org/10.1063/5.0055859
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