Author(s): Tomonao Kobayashi; Toshifumi Aibara; Hirokazu Harada
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Abstract: Laboratory experiments to analyze horseshoe vortices around a vertical cylinder on a scoured bed by using an image processing technique are described. The horseshoe vortices are discussed in terms of vorticity distribution. Vorticity concentration of the horseshoe vortex's counter-rotating is observed in a deep part of the scour hole, close to where the stagnation area is gener-ated. This feature is invisible in the field of velocity distribution. Experimental results from different scour depths lead that, al-though a horseshoe vortex keeps its strength almost constant, its counter-rotating vorticity becomes stronger as the scour hole is deeper.
Year: 1997