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공공누리This item is licensed Korea Open Government License

Drag Reduction of a Bluff Body by Grooves Laid Out by Design of Experiment
Publication Year
In this study, we used the Taguchi method to derive the optimal design parameters for the
grooves formed on the upper surface of a circular cylinder. Using the derived values of the
optimal design parameters, we created grooves on diphycercal the surfaces of a circular cylinder
and analyzed the wake flow and the boundary-layer flow of the circular cylinder. The
streamwise time mean velocity and turbulence intensity of the wake flow field were used as
the characteristics. Based on these characteristics, the optimal design parameter values
were selected: n¼3, k¼1.0mm (k/d¼2.5%), and h¼60 deg. When the grooved cylinder
was used, the streamwise time mean velocity in the wake of the cylinder showed 12.3%
recovery, the wake width was reduced by 18.4% compared to the results from the smooth
cylinder and we had 28.2% drag reduction from that of smooth cylinder. Also, the flow on
the smooth cylinder separated at around 82 deg but the flow separation on a grooved cylinder
appeared beyond 90 deg, that reducing the drag
bluff body; circular cylinder; blade; groove; drag reduction; energy saving; design of experiment(DOE); the Taguchi method; PIV
Journal Title
Journal of fluids engineering
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