The stabilizing effect of streaks on Tollmien-Schlichting and oblique waves: A parametric study
2007 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 19, no 7, 078103-1-078103-4 p.Article in journal (Refereed) Published
The stabilizing effect of finite amplitude streaks on the linear growth of unstable perturbations [Tollmien-Schlichting (TS) and oblique waves] is numerically investigated by means of the nonlinear parabolized stability equations. We have found that for stabilization of a TS-wave, there exists an optimal spanwise spacing of the streaks. These streaks reach their maximum amplitudes close to the first neutral point of the TS-wave and induce the largest distortion of the mean flow in the unstable region of the TS-wave. For such a distribution, the required streak amplitude for complete stabilization of a given TS-wave is considerably lower than for beta=0.45, which is the optimal for streak growth and used in previous studies. We have also observed a damping effect of streaks on the growth rate of oblique waves in Blasius boundary layer and for TS-waves in Falkner-Skan boundary layers.
Place, publisher, year, edition, pages
2007. Vol. 19, no 7, 078103-1-078103-4 p.
blasius boundary-layer, transition
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-16836DOI: 10.1063/1.2746047ISI: 000248486100047ScopusID: 2-s2.0-34547814063OAI: oai:DiVA.org:kth-16836DiVA: diva2:334879
QC 20100525 Tidigare titel: The stabilizing effect of streaks on TS-waves: A parametric study2010-08-052010-08-052010-11-03Bibliographically approved