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The aim of this study is the control of unsteady vortical flow occurred downstream of a circular cylinder located in shallow water flow using concentrically located outer perforated cylinder. The porosities, ȕ have been changed between 0.1 and 0.8 in the present study. The increments of porosity ȕ were taken as 0.05 in the range of 0.1 and 0.8 with a hole diameter of d=10 mm. The ratio of inner cylinder diameter to outer cylinder diameter, D i /D o was selected as 0.25, 0.3, 0.4, 0.5 and 0.6doi:10.1051/epjconf/201714302094 fatcat:2qboeog7ibf33gtzobfef6k7le