When rod surface roughness is introduced in a turbulent Couette–Poiseuille flow (CP-flow), it is known that the Reynolds stresses near the centerline decrease due to weakened very-large-scale motions (VLSMs) and roll-cell motions [Lee, Y. M. et al., “Direct numerical simulation of a turbulent Couette–Poiseuille flow with a rod-roughened wall,” Phys. Fluids 30, 105101 (2018)]. In the present study, we examine the origin of the weakened turbulent structures near the centerline in a CP-flow with roughness (CPR-flow) using a dataset from direct numerical simulation. The top–down and bottom–up interactions to organize a CP-flow are very similar to those found in earlier studies in turbulent channel/pipe and boundary layer flows. The circulation of roll-cells in the outer region induces the spanwise congregation of negative streamwise velocity fluctuating structures (u) near the wall, leading to a large-scale ejection into the outer region. This large-scale ejection contributes to the formation of a negative VLSM when two adjacent negative large-scale motions merge, and the VLSM induces the circulation of roll-cell motion due to the pure kinematics. A similar process for the inner–outer interactions is found for a CPR-flow. However, because the impact of the surface roughness suppresses the collective motion of negative u-structures near the surface roughness, strong congregation by roll-cells is observed to occur far from the wall, indicating that relatively few negative u-structures with low strength contribute to the formation of a large-scale ejection for the CPR-flow. The weakened large-scale ejection decreases the strength of the VLSM, resulting in weakened roll-cell motion.
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Influence of the surface roughness on inner–outer interactions in a turbulent Couette–Poiseuille flow
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April 2021
Research Article|
April 08 2021
Influence of the surface roughness on inner–outer interactions in a turbulent Couette–Poiseuille flow
Jeong Hyun Kim (김정현);
Jeong Hyun Kim (김정현)
Department of Mechanical Engineering, UNIST
, 50 UNIST-gil, Eonyang-eup, Ulsan 44919, South Korea
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Young Mo Lee (이영모);
Young Mo Lee (이영모)
Department of Mechanical Engineering, UNIST
, 50 UNIST-gil, Eonyang-eup, Ulsan 44919, South Korea
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Jae Hwa Lee (이재화)
;
Jae Hwa Lee (이재화)
a)
Department of Mechanical Engineering, UNIST
, 50 UNIST-gil, Eonyang-eup, Ulsan 44919, South Korea
a)Authors to whom correspondence should be addressed: [email protected] Tel.: 82-52-217-2350 and [email protected] Tel.: 82-52-217-2362
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Jooha Kim (김주하)
Jooha Kim (김주하)
a)
Department of Mechanical Engineering, UNIST
, 50 UNIST-gil, Eonyang-eup, Ulsan 44919, South Korea
a)Authors to whom correspondence should be addressed: [email protected] Tel.: 82-52-217-2350 and [email protected] Tel.: 82-52-217-2362
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a)Authors to whom correspondence should be addressed: [email protected] Tel.: 82-52-217-2350 and [email protected] Tel.: 82-52-217-2362
Physics of Fluids 33, 045113 (2021)
Article history
Received:
January 06 2021
Accepted:
March 09 2021
Citation
Jeong Hyun Kim, Young Mo Lee, Jae Hwa Lee, Jooha Kim; Influence of the surface roughness on inner–outer interactions in a turbulent Couette–Poiseuille flow. Physics of Fluids 1 April 2021; 33 (4): 045113. https://doi.org/10.1063/5.0043043
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