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The autonomous cycle of near-wall turbulence
Open accessAbstract
Numerical experiments on modified turbulent channels at moderate Reynolds numbers are used to differentiate between several possible regeneration cycles for the turbulent fluctuations in wall-bounded flows. It is shown that a cycle exists which is local to the near-wall region and does not depend on the outer flow. It involves the formation of velocity streaks from the advection of the mean profile by streamwise vortices, and the generation of the vortices from the instability of the streaks. Interrupting any of those processes leads to laminarization. The presence of the wall seems to be only necessary to maintain the mean shear. The generation of secondary vorticity at the wall is shown to be of little importance in turbulence generation under natural circumstances. Inhibiting its production increases turbulence intensity and drag.
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Citations
Cites
Turbulence statistics in fully developed channel flow at low Reynolds number
Kim, J., Moin, P., & Moser, R. (1987) · Journal of Fluid Mechanics · doi:10.1017/s0022112087000892 · Cited by 4,873
Cited by
On coherent-vortex identification in turbulence
Dubief †, Y., & Delcayre ‡, F. (2000) · Journal of Turbulence · doi:10.1088/1468-5248/1/1/011 · Cited by 787
Turbulence in supersonic boundary layers at moderate Reynolds number
Pirozzoli, S., & Bernardini, M. (2011) · Journal of Fluid Mechanics · doi:10.1017/jfm.2011.368 · Cited by 401
Metadata
- Authors
- JIMÉNEZ, J., & PINELLI, A.
- Venue
- Journal of Fluid Mechanics
- Publisher
- Cambridge University Press (CUP)
- Published
- 1999-06-25
- Volume
- 389
- Pages
- 335-359
- ISSN
- 0022-1120 (ISSN-L)
- 1469-7645
- OpenAlex
- W2099662911
- Cited by
- 876
- References
- 1
- FWCI
- 22.29
- Type
- journal article
- Language
- en
- Open access
- green
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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