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Thermophysics and Aeromechanics

2021 year, number 6

3D structure of the flow in a near wake behind a cylinder in the slot channel

M.V. Shestakov, D.M. Markovich
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: flow around a cylinder, slot channel, three-dimensional flow structure, longitudinal vortex structures, tomographic PIV method


The three-dimensional structure of the flow in the near field of a wake behind a cylinder in a slot channel was experimentally investigated. Based on direct measurements of three-component volumetric velocity distributions, the ave-raged flow structure in a wake behind the cylinder is presented for the cylinder height-to-diameter ratio of 0.4 and Reynolds number Re D = 3500. It is shown that the horseshoe vortices formed in front of the cylinder affect the flow structure significantly. It is found that two quadrupole distributions of mean longitudinal vorticity are formed in the near wake.