Abstract
Twenty-four small roughness elements in the boundary layer on a rotating cone trigger stationary vortices, which grow and saturate, followed by a rapid growth of non-stationary modes and a transition to turbulence.
Highlights
The transition to turbulence in the rotating-disk boundary layer has been investigated since the 1940s [1,2]
The route to turbulence in the boundary layer on a rotating broad cone is investigated using hot-wire anemometry measuring the azimuthal velocity
The stationary fundamental mode is triggered by 24 deterministic small roughness elements distributed evenly at a specific distance from the cone apex
Summary
The transition to turbulence in the rotating-disk boundary layer has been investigated since the 1940s [1,2]. Boundary-layer transition over a rotating broad cone In experiments one observes the development of stationary, with respect to the disk, corotating vortices in the boundary layer before transition to turbulence.
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