The effects of surface roughness on the vortex-induced vibration (VIV) characteristics of a circular cylinder were studied numerically. The response amplitude, vortex shedding frequency, structural vibration frequency, lock-in region, vortex shedding flow pattern and hydrodynamic coefficient with different degrees of surface roughness were compared. The numerical results show that the reduced velocity could be divided into four parts: initial branch, upper branch, lower branch and desynchronisation region based on the VIV response amplitude and frequency. During initial branch, the obvious pure lock-in phenomenon can be found; however, in upper and lower branches, dual lock-in is detected. Rough cylinders have a smaller VIV displacement and a narrower lock-in region than a smooth cylinder. However, the vortex shedding flow pattern has not affected by the surface roughness. As surface roughness increases, the Strouhal number tends to increase; however, the mean drag coefficient has a decreasing tendency.


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    Title :

    Effect of surface roughness on vortex-induced vibration response of a circular cylinder


    Contributors:
    Gao, Yun (author) / Zong, Zhi (author) / Zou, Li (author) / Jiang, Zongyu (author)

    Published in:

    Publication date :

    2018-01-02


    Size :

    15 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English