Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Reverse flow phenomenon in duct corners at a low Reynolds number. / Zaripov, Dinar; Ivashchenko, Vladislav; Mullyadzhanov, Rustam и др.
в: Physics of Fluids, Том 33, № 8, 085130, 01.08.2021.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Reverse flow phenomenon in duct corners at a low Reynolds number
AU - Zaripov, Dinar
AU - Ivashchenko, Vladislav
AU - Mullyadzhanov, Rustam
AU - Li, Renfu
AU - Markovich, Dmitriy
AU - Kähler, Christian J.
N1 - Funding Information: Numerical simulations and data analysis were conducted within the Russian Science Foundation, Grant No. 19–79-30075. The computational resources were provided by the Ministry of Science and Higher Education of the Russian Federation, Project No. 075–15-2019–1888. Publisher Copyright: © 2021 Author(s).
PY - 2021/8/1
Y1 - 2021/8/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85113593371&partnerID=8YFLogxK
U2 - 10.1063/5.0055859
DO - 10.1063/5.0055859
M3 - Article
AN - SCOPUS:85113593371
VL - 33
JO - Physics of Fluids
JF - Physics of Fluids
SN - 1070-6631
IS - 8
M1 - 085130
ER -
ID: 34086169