TY - JOUR
T1 - On a mechanism of near-wall reverse flow formation in a turbulent duct flow
AU - Zaripov, Dinar
AU - Ivashchenko, Vladislav
AU - Mullyadzhanov, Rustam
AU - Li, Renfu
AU - Mikheev, Nikolay
AU - Kähler, Christian J.
N1 - Funding Information:
Experiments were conducted within the Russian Science Foundation grant no. 19-19-00355. Numerical simulations and data analysis were conducted within the Russian Science Foundation grant no. 19-79-30075. The development of the numerical code was supported by the state contract with IT SB RAS. The computational resources were provided by the Joint Supercomputer Center of the Russian Academy of Sciences, Moscow.
Funding Information:
Experiments were conducted within the Russian Science Foundation grant no. 19-19-00355. Numerical simulations and data analysis were conducted within the Russian Science Foundation grant no. 19-79-30075. The development of the numerical code was supported by the state contract with IT SB RAS. The computational resources were provided by the Joint Supercomputer Center of the Russian Academy of Sciences, Moscow.
Publisher Copyright:
©
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021
Y1 - 2021
N2 - 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. 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 with those for (Chin et al., Phys. Rev. Fluids, vol. 3, issue 11, 2018, p. 114607) and (Cardesa et al., J. Fluid Mech., vol. 880, 2019) indicates the generality of the proposed mechanism.
AB - 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. 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 with those for (Chin et al., Phys. Rev. Fluids, vol. 3, issue 11, 2018, p. 114607) and (Cardesa et al., J. Fluid Mech., vol. 880, 2019) indicates the generality of the proposed mechanism.
KW - boundary layer structure
KW - shear layer turbulence
KW - turbulent boundary layers
UR - http://www.scopus.com/inward/record.url?scp=85111429547&partnerID=8YFLogxK
U2 - 10.1017/jfm.2021.526
DO - 10.1017/jfm.2021.526
M3 - Article
AN - SCOPUS:85111429547
VL - 923
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
M1 - A20
ER -