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Vol. 58 No. 2

February 2006

Offshore Facilities: Construction and Design

High-Mode-Number Vortex-Induced-Vibration Field Experiments

This paper presents the initial results from vortex-induced-vibration (VIV) field testing of a long, flexible, model riser at a high mode number. The experiments were designed to gain understanding of the dynamic behavior of a long riser in uniform flow responding at mode numbers ranging from 10 to 25 in crossflow vibration. The observed reduced velocity and root-mean-square (RMS) displacement-response levels were reported. Mean values of the drag coefficient, Cd, and hydrodynamic damping derived from measured data were compared with calculated values from formulas commonly used in engineering design of offshore systems.

View a Synopsis of OTC 17383.

This article, written by Technology Editor Dennis Denney, contains highlights of paper OTC 17383, "High-Mode-Number Vortex-Induced-Vibration Field Experiments," by J.K. Vandiver, Massachusetts Inst. of Technology; H. Marcollo, AMOG Consulting; and S. Swithenbank and V. Jhingran, Massachusetts Inst. of Technology, prepared for the 2005 Offshore Technology Conference, Houston, 2-5 May. Copyright 2005 Offshore Technology Conference. Reproduced by permission. The paper has not been peer reviewed.

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