Comparison of Flow Structures in the Downstream Region of a Cylinder with Flexible Strip

Department of Mechanical Engineering, Yuzuncu Yil University, 65080 Van, Turkey

^a Corresponding author: steksin@yyu.edu.tr

Published online: 6 May 2015

Abstract

The present study investigates the details of flow structure to downstream of a circular cylinder mounted on a flat surface, in successive plan-view plane both in the boundary layer and up level region. The behavior of the flow in the wake of the bare cylinder and attached a flexible strip which has a 1400 N/mm² modulus of elasticity vinyl PVC transperent film. The length of strip 240 mm (L/D=4) is investigated using Particle Image Velocimetry (PIV) technique for Reynolds numbers based on the cylinder diameter of 2500. The flow data downstream of the cylinder are presented using time-averaged velocity vector map, V_avg, streamline patterns, ψ_avg, vorticity contours, ω_avg, and Reynolds stress correlations, u^’u^’ _avg, v^’v^’ _avg, u^’v^’ _avg and rms velocity values. The locations of the peak values of Reynolds stress correlations and other data are also presented in both bare cylinder and attached body in order to determine the regions under high fluctuations. Another L/D ratios will be investigated in other experiments.