... and propagation mechanism of the rotating stall of the hump instability region. The frequency characteristics and spatial intensity distribution of the stall cells are studied by adopting the proper orthogonal decomposition (POD) method. The results indicate that the energy loss at 0.80Q DES and 0.75Q DES...

... decomposition (POD) and spectral proper orthogonal decomposition (SPOD). Both POD and SPOD analysis reveal the existence of two types of unsteadiness in the flow field in the volute, one is the large-scale fluctuations at rotation frequency and its high-order harmonics in the main outlet flow, the other is due...

... using the time-resolved PIV technique and Laser-induced fluorescence technique at three different depths. The measured flow field was later decomposed by the time-resolved POD technique, which exposed the large-scale structures buried in the surface jet. Even though the time-averaged mean flow fields...

...). The large-scale structures were exposed by performing a proper orthogonal decomposition (POD) analysis of the velocity field obtained using a particle image velocimetry system. Measurements were made on vertical and horizontal planes—both containing the axis of the jet. All fields-of-view were positioned...

... for the vortices detection and the proper orthogonal decomposition (POD) technique to extract the most energetic modes contained in the turbulent flow and to the turbulent flow filtering. A database has been also constituted and was used to test the validity of the most models of turbulence, and in particular...

... 27 08 2007 29 12 2007 09 06 2008 blades boundary layer turbulence bubbles convection flow separation flow simulation shear turbulence turbines two-phase flow vortices wakes blade-wake interactions LPT blade flow structures POD LES Transition, in general...

... in the far field were investigated by performing a proper orthogonal decomposition (POD) analysis of the velocity field obtained using a particle image velocimetry system. The number of modes used for the POD reconstruction of the velocity fields was selected to recover 40% of the turbulent kinetic energy...