Abstract
Recently, many studies on flow characteristics around square cylinder have been discussed especially on the shape modification and corner cuttings. However, the effect of grooves to the aerodynamic characteristics of square cylinder is still unknown. Therefore, in this study the flow characteristics around square cylinder with various grooves shapes is investigated in detailed by drag coefficient measurement. The shapes of the grooves are rectangle and arc. The drag is measured by a wind tunnel experiment. As the result, the square cylinders with grooves have a lower drag coefficient compared to square cylinder without grooves. Furthermore, the different drag coefficient reduction rate was observed in different grooves shape. The square cylinder with the rectangle shape grooves has a bigger reduction rate compared to arc shape grooves.
