Aerodynamic properties of closely spaced triple circular cylinders

Experimental investigations for the wake galloping of closely spaced triple circular cylinders were carried out. It is clarified that the central cylinder shows almost the same wake galloping behaviors as those of the leeward cylinder of tandem cylinders in close arrangement and the leeward one of triple cylinders also has the resemblant properties in large staggered angles; however, the wake galloping of the leeward cylinder in the small staggered angles was stabilized due to complicated flows around cylinders. The connection of triple cylinders suppresses the wake galloping effectively.