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The lift-up effect: The linear mechanism behind transition and turbulence in shear flows
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0002-4346-4732
2014 (engelsk)Inngår i: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 47, s. 80-96Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2014. Vol. 47, s. 80-96
Emneord [en]
Hydrodynamics stability, Shear flows, Transition to turbulence, Stability of non-Newtonian fluids
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-149183DOI: 10.1016/j.euromechflu.2014.03.005ISI: 000339131300012Scopus ID: 2-s2.0-84902553756OAI: oai:DiVA.org:kth-149183DiVA, id: diva2:738610
Forskningsfinansiär
Swedish e‐Science Research Center
Merknad

QC 20140818

Tilgjengelig fra: 2014-08-18 Laget: 2014-08-18 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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