000013910 001__ 13910
000013910 005__ 20161115094005.0
000013910 04107 $$aeng
000013910 046__ $$k2016-08-21
000013910 100__ $$aAbe, Yoshiaki
000013910 24500 $$aFlow instability on airfoil separation control at optimum actuation frequency

000013910 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013910 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013910 506__ $$arestricted
000013910 520__ $$2eng$$aThe present study reveals a role of flow instabilities in the spatially developing disturbance induced by a synthetic jet device (SJ) with an optimum actuation frequency, which improves a separation-control capability around an airfoil. For this purpose, a high fidelity flow computation (large-eddy simulation) is conducted, where the chord Reynolds number and angle of attack are set to be 63,000 and 12 [deg], respectively. The linear stability analysis is conducted to detect an unstable mode of the wall-normal fluctuation in the separation controlled flows. In the well-controlled flows, the harmonics of the input fluctuation directly enhances the Kelvin-Helmholtz instability which linearly develops in the separated shear layer, followed by higher- and lower-frequency modes that are triggered by the most unstable modes (nonlinear growth regime). The process above effectively enhances a turbulent transition and generation of large-scale coherent vortices.

000013910 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013910 653__ $$a

000013910 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013910 720__ $$aAbe, Yoshiaki
000013910 8560_ $$ffischerc@itam.cas.cz
000013910 8564_ $$s157137$$uhttps://invenio.itam.cas.cz/record/13910/files/PO.FM07-1.01.117.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 989, code PO.FM07-1.01.117).
000013910 962__ $$r13812
000013910 980__ $$aPAPER