On low drag aerodynamically stable pe-stay-cables and separation control in the critical Reynolds number domain by newly developed lumped surface roughness

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Wind-induced vibrations of the stay-cables are well known as one of important points in the wind resistant design of the recent cable stayd bridge. They are mainly due to their low damping structural characteristics and basically circular cross section. On the other hand their multi-cable arrangement tends to increase importance of reduction of the wind load of the stay-cables, which become to be of same order as of their deck. In this research newly developed low drag and aerodynamically stable PE stay-cables with lumped surface roughness is illustrated under the idea of separation control at the critical Reynolds number domain through a series of wind tunnel investigation. Density of dots in the patterned roughness and its arrangement are concluded to be two key factors to control the drag coefficient characteristics and the flow separation around the critical Reynolds number.