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The lift-up effect: The linear mechanism behind transition and turbulence in shear flows
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-4346-4732
2014 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 47, 80-96 p.Article in journal (Refereed) Published
Abstract [en]

The formation and amplification of streamwise velocity perturbations induced by cross-stream disturbances is ubiquitous in shear flows. This disturbance growth mechanism, so neatly identified by Ellingsen and Palm in 1975, is a key process in transition to turbulence and self-sustained turbulence. In this review, we first present the original derivation and early studies and then discuss the non-modal growth of streaks, the result of the lift-up process, in transitional and turbulent shear flows. In the second part, the effects on the lift-up process of additives in the fluid and of a second phase are discussed and new results presented with emphasis on particle-laden shear flows. For all cases considered, we see the lift-up process to be a very robust process, always present as a first step in subcritical transition.

Place, publisher, year, edition, pages
2014. Vol. 47, 80-96 p.
Keyword [en]
Hydrodynamics stability, Shear flows, Transition to turbulence, Stability of non-Newtonian fluids
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Other Physics Topics
URN: urn:nbn:se:kth:diva-149183DOI: 10.1016/j.euromechflu.2014.03.005ISI: 000339131300012ScopusID: 2-s2.0-84902553756OAI: diva2:738610
Swedish e‐Science Research Center

QC 20140818

Available from: 2014-08-18 Created: 2014-08-18 Last updated: 2014-08-18Bibliographically approved

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Brandt, Luca
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MechanicsLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
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