On the Vortex Dynamics in the Wake of High-Speed Low-Damping Galloping Cylinders
In this work, we focus on the vortex evolutions in the wake behind three non-axisymmetric rigid cylinders under high-speed, low-damping galloping in a wind tunnel. Laser displace sensor is used to measure the displacement amplitude and two branches of amplitude curves are observed—rising and falling range of galloping range. Particle Image Velocimetry is then used to investigate coherent vortex structures in the wake. It has been found that a D-section cylinder has a galloping response at the lowest free stream velocity, which also has the smallest formation length and recirculation bubble length when at static condition. The wake widths show a similar growth rate, which is independent of the galloping amplitudes.
KeywordsHigh-speed galloping Low-damping Amplitude spectra Vortex dynamics PIV
The authors thank the support from UK Royal Academy of Engineering (NRCP/1415/130) and China NSFC (11472158).
- 1.Williamson CHK, Govardhan R (2004) Vortex-induced vibrations. Annu Rev Fluid Mech 36Google Scholar
- 2.Wang Q, Song K, Xu S (2015) Experimental study of a spring-mounted wide-D-section cylinder in a cross flow. In: 3rd symposium on fluid-structure-sound interactions and controlGoogle Scholar
- 3.Mannini C, Marra AM, Bartoli G (2014) VIV galloping instability of rectangular cylinders: review and new experiments. J Wind Eng Ind Aerodyn 132Google Scholar