Abstract
The authors have reported that the two-dimensional Karman vortices behind a circular cylinder with diameter d are broken into lengths of about 8d and they form chains of spoon-shaped vortex couples. In the present experiment disks were attached to the cylinder so that the Karman vortices were artificially cut to fixed lengths of 4d, 6d, 8d and 10d. The structures with 8d were most stable forming a vortex chain with least irregularities and the wake was much wider than without the disks, while the neighbouring vortices with a length 4d merged to a scale of 8d, These results show that the length 8d is a unique scale in the deformation of the Karman vortices to a three-dimensional large scale structure.
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