Abstract
A supersonic (M∞=5.95) flow around a blunted cone with a cylindrically shaped single roughness element located in the bluntness region is considered. Numerical simulations are performed by means of solving the unsteady three-dimensional Navier-Stokes equations with a computational module that takes into account the action of external acoustic waves on the flow. Numerical data are obtained for the mean flow characteristics and evolution of disturbances formed in the wake behind the roughness element. It is shown that intense interaction of steady streamwise vortices occurs behind the single roughness element (Rekk=4880, k/δ=3.95) on the cone with a bluntness radius of 5mm. This interaction is accompanied by formation of three-dimensional finger-shaped structures in the azimuthal direction, which testifies to the initial stage of the laminar-turbulent transition.
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