  Most flows in nature and engineering are turbulent because of their large
velocities and spatial scales. Laboratory experiments of rotating
quasi-Keplerian flows, for which the angular velocity decreases radially but
the angular momentum increases, are however laminar at Reynolds numbers
exceeding one million. This is in apparent contradiction to direct numerical
simulations showing that in these experiments turbulence transition is
triggered by the axial boundaries. We here show numerically that as the
Reynolds number increases turbulence becomes progressively confined to the
boundary layers and the flow in the bulk fully relaminarizes. Our findings
support that turbulence is unlikely to occur in isothermal constant density
quasi-Keplerian flows.
