Abstract
The flow field produced by a vortex ring at Re = 2600 impinging on a flat plate was examined in detail using the smoke visualization method. The longitudinal vortex structure with a finger-like configuration was found which plays a crucial role in forming azimuthal coherent structures with a cross section that resembles that of an orange; the structures promote the flow field into turbulent state. The generating and developing process of the longitudinal vortex are discussed, and the topological aspects are inferred by integrating the information obtained through various local visualizations.
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