Abstract
Results of numerical simulations of low aspect-ratio rectangular jets are used to relate unsteady entrainment and fluid dynamics in the transitional regime, to examine their basic topological features and the role of aspect ratio effects. Two qualitatively different flow topologies for rectangular jets are demonstrated, with non-unity AR rectangular jets being characterized by single streamwise (rib) vortices aligned with comer regions — in contrast with pairs of counter rotating ribs aligned with corners for square jets. An overview of our present understanding of axis-switching phenomena for these jets is presented, and the important role of braid vortices is discussed in this context.
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