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A comparative study of the velocity and vorticity structure in pipes and boundary layers at friction Reynolds numbers up to 104

A comparative study of the velocity and vorticity structure in pipes and boundary layers at friction Reynolds numbers up to 104
A comparative study of the velocity and vorticity structure in pipes and boundary layers at friction Reynolds numbers up to 104

This study presents findings from a first-of-its-kind measurement campaign that includes simultaneous measurements of the full velocity and vorticity vectors in both pipe and boundary layer flows under matched spatial resolution and Reynolds number conditions. Comparison of canonical turbulent flows offers insight into the role(s) played by features that are unique to one or the other. Pipe and zero pressure gradient boundary layer flows are often compared with the goal of elucidating the roles of geometry and a free boundary condition on turbulent wall flows. Prior experimental efforts towards this end have focused primarily on the streamwise component of velocity, while direct numerical simulations are at relatively low Reynolds numbers. In contrast, this study presents experimental measurements of all three components of both velocity and vorticity for friction Reynolds numbers

ranging from 5000 to 10 000. Differences in the two transverse Reynolds normal stresses are shown to exist throughout the log layer and wake layer at Reynolds numbers that exceed those of existing numerical data sets. The turbulence enstrophy profiles are also shown to exhibit differences spanning from the outer edge of the log layer to the outer flow boundary. Skewness and kurtosis profiles of the velocity and vorticity components imply the existence of a ‘quiescent core’ in pipe flow, as described by Kwon et al. (J. Fluid Mech., vol. 751, 2014, pp. 228–254) for channel flow at lower

, and characterize the extent of its influence in the pipe. Observed differences between statistical profiles of velocity and vorticity are then discussed in the context of a structural difference between free-stream intermittency in the boundary layer and ‘quiescent core’ intermittency in the pipe that is detectable to wall distances as small as 5 % of the layer thickness.
0022-1120
182-213
Zimmerman, S.
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Philip, J.
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Monty, J.P.
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Talamelli, A.
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Marusic, I.
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Ganapathisubramani, B.
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Hearst, R.J.
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Bellani, G.
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Baidya, R.
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Samie, M.
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Zheng, X.
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Dogan, E.
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Mascotelli, L.
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Klewicki, J.
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Zimmerman, S.
df5ea839-3bf1-4d8b-91d3-b4abaa5ed5be
Philip, J.
f1fbacf5-cfa7-4801-8eff-02324b4aa51b
Monty, J.P.
b73588eb-5749-46f9-8efb-b2e52924c27e
Talamelli, A.
e500644c-4a0c-44e4-8563-409f9a6a4fef
Marusic, I.
59f585da-d4ab-4dbf-8a74-421f5fb90e6a
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
Hearst, R.J.
965708e6-ddf4-4cbb-af74-866bb4cdb4de
Bellani, G.
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Baidya, R.
70ad4296-d11d-4b17-a40d-58fb038b0705
Samie, M.
9a0309ef-0fe8-4ff7-88bb-ba8d218ae2c4
Zheng, X.
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Dogan, E.
3e8b9ffd-3879-4407-a326-57f909916ba7
Mascotelli, L.
3f328e9c-32d7-440f-9e64-2f3460974ff4
Klewicki, J.
23e3e0d9-fc56-4494-a7b9-6bc02191f636

Zimmerman, S., Philip, J., Monty, J.P., Talamelli, A., Marusic, I., Ganapathisubramani, B., Hearst, R.J., Bellani, G., Baidya, R., Samie, M., Zheng, X., Dogan, E., Mascotelli, L. and Klewicki, J. (2019) A comparative study of the velocity and vorticity structure in pipes and boundary layers at friction Reynolds numbers up to 104. Journal of Fluid Mechanics, 869, 182-213. (doi:10.1017/jfm.2019.182).

Record type: Article

Abstract


This study presents findings from a first-of-its-kind measurement campaign that includes simultaneous measurements of the full velocity and vorticity vectors in both pipe and boundary layer flows under matched spatial resolution and Reynolds number conditions. Comparison of canonical turbulent flows offers insight into the role(s) played by features that are unique to one or the other. Pipe and zero pressure gradient boundary layer flows are often compared with the goal of elucidating the roles of geometry and a free boundary condition on turbulent wall flows. Prior experimental efforts towards this end have focused primarily on the streamwise component of velocity, while direct numerical simulations are at relatively low Reynolds numbers. In contrast, this study presents experimental measurements of all three components of both velocity and vorticity for friction Reynolds numbers

ranging from 5000 to 10 000. Differences in the two transverse Reynolds normal stresses are shown to exist throughout the log layer and wake layer at Reynolds numbers that exceed those of existing numerical data sets. The turbulence enstrophy profiles are also shown to exhibit differences spanning from the outer edge of the log layer to the outer flow boundary. Skewness and kurtosis profiles of the velocity and vorticity components imply the existence of a ‘quiescent core’ in pipe flow, as described by Kwon et al. (J. Fluid Mech., vol. 751, 2014, pp. 228–254) for channel flow at lower

, and characterize the extent of its influence in the pipe. Observed differences between statistical profiles of velocity and vorticity are then discussed in the context of a structural difference between free-stream intermittency in the boundary layer and ‘quiescent core’ intermittency in the pipe that is detectable to wall distances as small as 5 % of the layer thickness.

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Accepted/In Press date: 26 February 2019
e-pub ahead of print date: 23 April 2019
Published date: 25 June 2019

Identifiers

Local EPrints ID: 432815
URI: http://eprints.soton.ac.uk/id/eprint/432815
ISSN: 0022-1120
PURE UUID: 2640bc4f-42e7-438d-a15f-4d861d1f6731
ORCID for B. Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

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Date deposited: 26 Jul 2019 16:30
Last modified: 07 Oct 2020 01:58

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