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Drag amplification of long flexible riser models undergoing multi-mode VIV in uniform currents

Huang, Shan and Khorasanchi, Mahdi and Herfjord, Kjell (2011) Drag amplification of long flexible riser models undergoing multi-mode VIV in uniform currents. Journal of Fluids and Structures, 27 (3). pp. 342-353. ISSN 0889-9746

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Abstract

Measurement data of longf lexibleriser models are used to study the drag amplification due tomulti-mode vortex induced vibration (VIV). The riser model was towed in a towing tank, and vibration along its length was measured indirectly at a set of discrete points using accelerometers, along with the total drag and lift forces on the model. These data were used to fit expressions for the drag amplification taking into account the spatial variation of the vibration amplitude along the riser length.The result swere compared with the existing empirical expression used in the VIV analysis tool SHEAR7 as wellas other test data. It was found that the expression in SHEAR7 agrees well with the test data. However, for larger vibration amplitudes, it appears to under-predict the drag amplification.

Item type: Article
ID code: 35839
Keywords: vortex induced vibration, VIV , drag amplification, flexible cylinder, deepwater riser, Naval architecture. Shipbuilding. Marine engineering, Mechanical Engineering
Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
Department: Faculty of Engineering > Naval Architecture and Marine Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 11 Nov 2011 16:29
    Last modified: 30 May 2014 05:05
    URI: http://strathprints.strath.ac.uk/id/eprint/35839

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