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An experimental study of oblique transition in a Blasius boundary layer flow
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-1146-3241
2000 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 19, no 5, 615-636 p.Article in journal (Refereed) Published
Abstract [en]

Transition initiated by a pair of oblique waves was investigated experimentally in a Blasius boundary layer how by using hot-wire measurements and flow visualisation. The oblique waves were generated by periodic blowing and suction through an array of pipes connecting to the flow through a transverse slit in the flat plate model. The structure of the flow held is described and the amplitude of individual frequency-spanwise wave number modes was determined from Fourier transforms of the disturbance velocity. In contrast to results from investigations of oblique transition at subcritical flow conditions, the transition process at the present conditions suggests the combined effect of non-modal growth of streaks and a second stage with exponential growth of oblique waves to initiate the final breakdown stage.

Place, publisher, year, edition, pages
2000. Vol. 19, no 5, 615-636 p.
Keyword [en]
oblique transition, boundary layer flow, non-modal disturbance, plane poiseuille flow, self-sustaining process, secondary instability, 3-dimensional disturbances, shear flows, hydrodynamic stability, streamwise streaks, growth, simulations, turbulence
Identifiers
URN: urn:nbn:se:kth:diva-20101ISI: 000089849100007OAI: oai:DiVA.org:kth-20101DiVA: diva2:338794
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Alfredsson, P. Henrik

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