Abstract
Effects of spanwise-periodic disturbances generated by steady active ventilation on the surface of a cylinder are investigated. The wake flow is studied experimentally using flow visualization and hot-wire measurements and numerically using FLUENT TM . Periodic porosity induces the formation of a series of steady counter-rotating vortex structures behind the porous patches, with or without suction being applied. A considerable closing of the wake occurs when porosity is placed on both the top and bottom surfaces, leading to a reduction in drag. The formation of spanwise vortices is suppressed, resulting in a reduction of the velocity fluctuation level and the elimination of oscillation in lift. The formation and spatial evolution of streamwise vortices is discussed.
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