000014596 001__ 14596
000014596 005__ 20161115100156.0
000014596 04107 $$aeng
000014596 046__ $$k2016-08-21
000014596 100__ $$aRen, Jie
000014596 24500 $$aSecondary instabilities of Görtler vortices in high-speed boundary layer flows

000014596 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014596 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014596 506__ $$arestricted
000014596 520__ $$2eng$$aGortler vortices developed in laminar boundary layer experience remarkable changes when the flow is subj ected to compressibil- ity effect. In the present study, five Ma numbers, covering incompressible to hypersonic flows, at Ma : 0.015, 1.5, 3.0, 4.5 and 6.0 are specified to illustrate this compressibility effect. G'ortler vortices in subsonic and moderate supersonic flows (Ma : 0.015, 1.5, 3.0) are governed by the conventional wall-layer mode (mode W). In hypersonic flows (Ma : 4.5, 6.0), the trapped-layer mode (mode T) becomes dominant. This difference maintains and intensifies downstream leading to different scenarios of secondary instabilities. The secondary instabilities of G'ortler vortices set in when the resulting streaks are adequately developed. The secondary perturbations become unstable downstream following the sequence of sinuous mode type I, varicose mode and sinuous mode type 11 indicating an increasing threshold amplitude. Onset conditions are determined for these modes. The above three modes each can have the largest growth rate under the right conditions.

000014596 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014596 653__ $$a

000014596 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014596 720__ $$aRen, Jie
000014596 8560_ $$ffischerc@itam.cas.cz
000014596 8564_ $$s167340$$uhttps://invenio.itam.cas.cz/record/14596/files/TS.FM07-7.05.pdf$$yOriginal version of the author's contribution as presented on CD,  page 987, code TS.FM07-7.05
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000014596 962__ $$r13812
000014596 980__ $$aPAPER