Abstract
The objective of this study is to understand the effects of the depths, widths and intervals of grooves on square cylinders for the flow characteristics. Experimental investigations on the flow around square cylinders were carried out at Re=7.4x10^4. Flow visualization with the Spark tracing method was also implemented. As the result we can determine the effect of flow characteristic by groove's interval and width in many condition. It is found that the drag coefficients of the square cylinder with grooves reduce in comparison with the square cylinder without grooves. Moreover, increasing the groove interval is more effective for reducing the drag coefficient than increasing the groove width.
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