The lift-up effect: The linear mechanism behind transition and turbulence in shear flows
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
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.
Hydrodynamics stability, Shear flows, Transition to turbulence, Stability of non-Newtonian fluids
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-149183DOI: 10.1016/j.euromechflu.2014.03.005ISI: 000339131300012ScopusID: 2-s2.0-84902553756OAI: oai:DiVA.org:kth-149183DiVA: diva2:738610
FunderSwedish e‐Science Research Center
QC 201408182014-08-182014-08-182014-08-18Bibliographically approved