Modifications of circular cylinder surfaces, such as strakes and helical wires, effectively mitigate Kármán vortex-induced vibrations normal to flow and have been applied to the reduction of large-amplitude vibrations of stay cables in bridges, which occur under wind oblique to a cable with or without rainfall. This aerodynamic control method cannot be fully effective without un-derstanding the behavior of the flow around and the associated forces on oblique cables. To ad-dress this issue, flow around a yawed cylinder with various strake patterns was studied using three-dimensional detached eddy simulation (DES) at Reynolds number of 1.4×105. Results demonstrated that strake patterns strongly influence the development of flow structures around a yawed cylinder and therefore the associated forces on the cylinder. The results suggest that par-ticular strake patterns can mitigate large-amplitude and low-frequency vibrations of stay cables induced by oblique wind.
Citation: Journal of Wind Engineering and Industrial Aerodynamics
Pub Type: Journals
cable vibration, cable-stayed bridge, yawed circular cylinder, detached eddy simulation (DES), strake effect, aerodynamic control.