Streak oscillations of finite length: Disturbance evolution and growth
2004 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 16, no 8, 3227-3230 p.Article in journal (Refereed) Published
Secondary instabilities of low-velocity streaks are studied in a plane channel flow. The secondary instability is forced by a sinusoidal signal consisting of N periods, where N ranges from 0.5 to 30. The disturbance distribution of the secondary instability is found to be similar to previous measurements on streaks forced by infinitely long wave trains. The amplitude growth of the localized secondary instabilities is close to exponential for N>4. However, for N<4 it is found that the exponential growth factor varies considerably both in the streamwise direction and with N with high values at upstream positions. It is proposed that these effects are due to transient growth of the localized secondary instabilities.
Place, publisher, year, edition, pages
2004. Vol. 16, no 8, 3227-3230 p.
IdentifiersURN: urn:nbn:se:kth:diva-13100DOI: 10.1063/1.1758152ISI: 000222528300044ScopusID: 2-s2.0-4344625564OAI: oai:DiVA.org:kth-13100DiVA: diva2:320845
QC 201005272010-05-272010-05-272011-09-26Bibliographically approved