Characteristics of scour and flow field beneath a forced vibrating circular cylinder

Characteristics of scour and flow field beneath a forced vibrating circular cylinder.
Chiew, Y.and Hsieh, S. and Low, Y.
In: ICSE 2016 (8th International Conference on Scour and Erosion), 12-15 September 2016, Oxford, UK. (2016)

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Abstract:The objective of the study is to enhance the understanding of scour under a steel catenary riser (SCR), in particular the influence of the SCR dynamic motions on scour. The motion of an SCR could be attributed to the motions of the attached floating platform induced by surface waves and/or currents. In this study, a circular cylinder mounted elastically on a forced vibrating rod was installed and three vibration frequencies were tested to simulate this phenomenon. Flow visualization and high time-resolved PIV measurement techniques were applied to observe and measure the flow field around the cylinder. The results show that there are two distinct types of scour processes, depending on the imposed vibration frequency even though they have the same amplitude. Based on the qualitative observation and quantitative measurement of the flow field and turbulence characteristics, the formation and transmission of the vortices are discussed in this paper.
Item Type:Conference or Workshop Item (Paper)
Subjects:Maritime > General
Coasts > General
ID Code:1587
Deposited On:22 Oct 2018 13:44
Last Modified:22 Oct 2018 13:44

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