000014443 001__ 14443
000014443 005__ 20161115100151.0
000014443 04107 $$aeng
000014443 046__ $$k2016-08-21
000014443 100__ $$aParedes, Pedro
000014443 24500 $$aInteraction of supersonic boundary layer instabilities with stationary streamwise streaks

000014443 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014443 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014443 506__ $$arestricted
000014443 520__ $$2eng$$aThe nonlinear evolution of the linearly optimal stationary perturbations in a Mach 3 flat plate boundary layer is computed using the nonlinear, perturbation form of parabolized Navier-Stokes equations. As noted in previous works, the optimal initial disturbances correspond to steady counter-rotating streamwise vortices, which subsequently lead to the formation of streamwise-elongated structures, i.e., streaks, via a lift-up effect. To assess the effect of the finite-amplitude streaks on boundary layer instabilities, the plane-marching PSE are used to investigate the instability of the boundary layer flow modified by spanwise periodic streaks. Finite-amplitude streaks are known to stabilize Tollmien-Schlichting waves in the incompressible regime. Here, subcritical streaks are observed to destabilize first mode instabilities with two spanwise wavelengths of the streak while they stabilize those with three and four spanwise wavelengths. These results support the passive flow control strategy of using micro-vortex-generators for delaying transition due to oblique first mode instabilities in supersonic boundary layers.

000014443 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014443 653__ $$a

000014443 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014443 720__ $$aParedes, Pedro
000014443 8560_ $$ffischerc@itam.cas.cz
000014443 8564_ $$s157293$$uhttps://invenio.itam.cas.cz/record/14443/files/TS.FM02-4.03.pdf$$yOriginal version of the author's contribution as presented on CD,  page 520, code TS.FM02-4.03
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000014443 962__ $$r13812
000014443 980__ $$aPAPER