  A three-dimensional direct numerical simulation (3D DNS) is performed to
describe the turbulent flow in an enclosed rotor-stator cavity characterized by
a large aspect ratio $G=(b-a)/h=18.32$ and a small radius ratio $a/b=0.15$ ($a$
and $b$ the inner and outer radii of the rotating disk and $h$ the interdisk
spacing). Recent comparisons with velocity measurements have shown that, for
the rotational Reynolds number $Re=\Omega b^2/\nu=95000$ ($\Omega$ the rate of
rotation of the rotating disk and $\nu$ the kinematic viscosity of water) under
consideration, the stator boundary layer is 3D turbulent and the rotor one is
still laminar. Budgets for the turbulence kinetic energy are here presented and
highlight some characteristic features of the effect of rotation on turbulence.
A quadrant analysis of conditionally averaged velocities is also performed to
identify the contributions of different events (ejections and sweeps) on the
Reynolds shear stress.
