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Extreme wall shear stress events in turbulent pipe flows: spatial characteristics of coherent motions

Published online by Cambridge University Press:  07 October 2020

Byron Guerrero Open the ORCID record for Byron Guerrero [Opens in a new window] ,
Martin F. Lambert  and
Rey C. Chin
Byron Guerrero
Affiliation:
School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia5005, Australia
Martin F. Lambert
Affiliation:
School of Civil, Environmental and Mining Engineering, University of Adelaide, Adelaide, South Australia5005, Australia
Rey C. Chin*
Affiliation:
School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia5005, Australia
*
†Email address for correspondence: [email protected]
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Abstract

This work presents a detailed analysis of the flow structures relevant to extreme wall shear stress events for turbulent pipe flow direct numerical simulation data at a friction Reynolds number $\textit {Re}_{\tau} \approx 1000$. The results reveal that extreme positive wall-friction events are located below an intense sweep (Q4) event originated from a strong quasi-streamwise vortex at the buffer region. This vortex transports high streamwise momentum from the overlap and the outer layers towards the wall, giving rise to a high-speed streak within the inner region. This vortical structure also relates to regions with extreme wall-normal velocity. Consequently, the conditional fields of turbulence production and viscous dissipation exhibit peaks whose magnitudes are approximately 25 times higher than the ensemble mean quantities in the vicinity of the extreme positive events. An analysis of the turbulent inertia force reveals that the energetic quasi-streamwise vortex acts as an essential source of momentum at the near-wall region. Similarly, extremely rare backflow events are studied. An examination of the wall-normal vorticity and velocity vector fields shows an identifiable oblique vortical structure along with two other large-scale roll modes. These counter-rotating motions contribute to the formation of backflow events by transporting streamwise momentum from the inner to the outer region, creating a large-scale meandering low-speed streak. It is found that extreme events are clustered below large-scale structures of positive streamwise momentum that interact with near-wall low-speed streaks, related to regions densely populated with vortical structures. Finally, a three-dimensional model is proposed to conceptualise the flow dynamics associated with extreme events.

JFM classification

Turbulent Flows: Turbulence simulation Boundary Layers: Pipe flow boundary layer
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 904 , 10 December 2020 , A18
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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