A computational study based on well-resolved large-eddy simulations is performed to study the skin friction modification by a large-eddy breakup device (LEBU) in a zero-pressure-gradient turbulent boundary layer. The LEBU was modeled using an immersed boundary method. It is observed that the presence of the device leads to the generation of wake vortices, which propagate downstream from the LEBU and toward the wall. A skin friction decomposition procedure is utilized to study different physical mechanisms of the observed skin friction reduction. From the skin friction decomposition, it is found that the skin friction reduction can be characterized by three universal regions of different changes for the skin friction contributions. The first region is predominantly associated with the formation of the wake vortices and the reduction of Reynolds shear stress. In the second region, the mean streamwise velocity fields show that a region of velocity deficit formed downstream of the LEBU propagates toward the wall and leads to turbulence reduction due to wake wall interactions, which also induces a local maximum skin friction reduction. In the third region, the dissipation of wake vortices leads to the regeneration of Reynolds shear stress. A quadrant analysis of the Reynolds shear stress contribution reveals that the LEBU increases the Q2 and Q4 contributions and attenuates the Q1 and Q3 contributions in the first region, followed by an onset of Reynolds shear stress further downstream.
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The skin-friction coefficient of a turbulent boundary layer modified by a large-eddy break-up device
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March 2021
Research Article|
March 31 2021
The skin-friction coefficient of a turbulent boundary layer modified by a large-eddy break-up device
I. C. Chan (陳志燁)
;
I. C. Chan (陳志燁)
a)
1
School of Mechanical Engineering, University of Adelaide
, Adelaide, 5005 South Australia, Australia
a)Author to whom correspondence should be addressed: [email protected]
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R. Örlü
;
R. Örlü
2
SimEx/FLOW, Engineering Mechanics, KTH Royal Institute of Technology
, SE-100 44 Stockholm, Sweden
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P. Schlatter
;
P. Schlatter
2
SimEx/FLOW, Engineering Mechanics, KTH Royal Institute of Technology
, SE-100 44 Stockholm, Sweden
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R. C. Chin
R. C. Chin
1
School of Mechanical Engineering, University of Adelaide
, Adelaide, 5005 South Australia, Australia
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a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 33, 035153 (2021)
Article history
Received:
January 13 2021
Accepted:
March 08 2021
Citation
I. C. Chan, R. Örlü, P. Schlatter, R. C. Chin; The skin-friction coefficient of a turbulent boundary layer modified by a large-eddy break-up device. Physics of Fluids 1 March 2021; 33 (3): 035153. https://doi.org/10.1063/5.0043984
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