The unsteady turbulent flow in a rotating channel provided with wall-mounted ribs is investigated by means of Time-Resolved Particle Image Velocimetry. Space-time series of instantaneous velocity highlight the flapping motion of the separating and reattaching shear layer, while the shedding of spanwise vortices from the ribs is visualized using the swirling strength criterion. Space-time velocity correlations provide the convection velocity, the Eulerian and the Lagrangian scales in the free shear layer behind the rib. The major effects of rotation on these flow characteristics are demonstrated: those are related to the ability of Coriolis forces of promoting/inhibiting turbulence activity depending on the mutual orientation of system angular velocity and relative mean vorticity.
|Original language||English (US)|
|State||Published - Jan 1 2011|
|Event||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada|
Duration: Jul 28 2011 → Jul 31 2011
|Other||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011|
|Period||7/28/11 → 7/31/11|