| Abstract |
Understanding the effect of swirl on axisymmetric wakes is essential for both practical applications and fundamental research. Swirling flows exhibit different instabilities than their non-swirling counterparts. If better understood, this different instability can potentially be exploited to control these flows in various applications. To better understand the impacts of rotation on the wake, this study employs SPIV measurements of the wake behind a rotating porous disk, taken at a cross-plane located three diameters downstream, as input for Proper Orthogonal Decomposition (POD) analysis. The findings indicate that swirl has a significant impact on both single-point and two-point statistics, that alters the POD results significantly. Specifically, adding swirl to the flow results in an energy redistribution towards lower order modes and creates a rotation in the mode shapes, suggesting changes in the flow’s turbulence structure. |
, Jonathan W. Naughton 
