Abstract
The objective of this study is to understand the aerodynamic characteristics of three-dimensional flow around square cylinder with grooves. This study clarifies the effects of the drag reduction using the grooves of square cylinders. Experimental investigations on the flow around square cylinders were implemented in the range of 5.0x10^4=<R=<1.0x10^5. Flow visualizations with the suspension method of the flow were also implemented. The results demonstrate that a drag coefficient also decreases, As the groove width become smaller. Furthermore, a drag coefficient increases by enlarging a groove interval. It is found that the drag coefficient with groove decreased by about 8% in compared without groove.
