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- W2956069404 abstract "The resulting wavelength of Gortler vortices in boundary layers over concave surfaces is determined by the upstream history of the flow and by wall disturbances such as roughness, heating/cooling strips or suction and blowing. In isotropic disturbance conditions, the predominant spanwise wavelength corresponds to the strongest growing vortex mode predicted by the linear stability theory. If the disturbance environment is not isotropic, vortices with wavelength different from the one with the highest growth rate may emerge. The present investigation considers the wavelength selection when Gortler vortices are excited by a suction and blowing strip at the wall. The study is based on numerical simulations of the vorticity transport equations derived from the Navier-Stokes equations. They are solved using a compact high-order finite difference technique. The results show that, when the vortices are excited by suction and blowing at the wall, their spanwise wavelength does not necessarily correspond to the imposed wavelength. Curves of streamwise development of the disturbance energy for different harmonics are presented, showing the evolution of the dominant modes. Isolines of streamwise velocity in the spanwise plane are also presented, showing how the higher harmonics distort the characteristic mushroom structures." @default.
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- W2956069404 date "2003-01-01" @default.
- W2956069404 modified "2023-09-24" @default.
- W2956069404 title "Seeding of Görtler vortices through a suction and blowing strip" @default.
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