Investigation Of A Catenary Riser
Undergoing VIV
Author(s)
J. M. Niedzwecki & G. Moe
Abstract
The vortex induced motion of structures in the ocean is a broad area of intense
research. This study focuses upon the analysis of data from an experimental
investigation of a towed instrumented catenary cylinder that was intended to
represent a steel catenary riser. The data that was collected at ten equally spaced
locations along the catenary included in-line and transverse are characterized in
terms of statistical parameters, extremes and mode shape. The extreme motion
response at selected elevations is presented in terms of probability of exceedance
graphs that provide a comparison of Gaussian and Weibull distribution models
with the measured data.
Keywords: SCR, catenary riser, model test, modes, Weibull distribution,
probability of exceedance.
1 Introduction
A great deal of attention has been focused upon developing a better
understanding of the behavior of offshore structures and, in particular, marine
risers undergoing vortex induced vibrations. Configurations involving of single
and multiple vertical standing risers have received the most attention. A variety
of computer codes have been developed for predicting their motion, but they two
rely heavily on empirics rather than a complete theoretical underpinning.
Steel catenary risers (SCRs) are a very important element in the production of
offshore reserves and have only recently been the subject of increasingly intense
investigation with regards to VIV excitation and response. Data selected from a
recent experimental study in which a model of a steel catenary riser was towed at
Keywords
SCR, catenary riser, model test, modes, Weibull distribution,
probability of exceedance.
Related Book
Other papers in this volume
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