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The wake behind the sphere; analysis of vortices during transition from steadiness to unsteadiness

Prządka W., Miedzik J., Gumowski K., Goujon-Durand S., Wesfreid J. E.

Archives of Mechanics

2008

Vol. 60, nr 6

467-474

This paper reports about an experimental investigation of the wake behind a solid sphere on a low velocity hydrodynamical channel for the Reynolds number in the range 250-310. The aim of the work is to analyze the size and shape of the vortices' cores and its change as a function of the Reynolds number. Special attention is paid to the transition from stationary flow, characterized by two counter-rotating longitudinal vortices, to instationary flow. The two-coloured visualization of the wake in steady and unsteady regimes is also presented.