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

摘要

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 averaged 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.