Abstract
Abstract
Highlights
The life of vortices around bluff bodies often begins with a shear layer (Jeon & Gharib 2004; Fernando & Rival 2016; Fernando et al 2017; Rosi & Rival 2017; Corkery, Babinsky & Graham 2019)
For all three Reynolds numbers, the centre of the primary vortex is located on the plate tip trajectory and the fitted spirals match the rolling up shear layer well based on visual inspection
The roll-up of a shear layer behind a rotating plate in a quiescent fluid is experimentally studied for different rotational velocities or Reynolds numbers
Summary
The life of vortices around bluff bodies often begins with a shear layer (Jeon & Gharib 2004; Fernando & Rival 2016; Fernando et al 2017; Rosi & Rival 2017; Corkery, Babinsky & Graham 2019). When a bluff body moves relative to a fluid flow, a thin layer of fluid emerges at the edge of the body where non-zero shear flow gradients are present. This shear layer is characterised by increased values of the flow vorticity. The interplay between the free stream or body’s velocity and the induced velocity of the growing coherent vortex cause the shear layer to become curved.
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