Development Of SCR VIV In A
Changing Flow Field
Author(s)
J. M. Niedzwecki & G. Moe
Abstract
The vortex induced vibrations targeted in laboratory model testing programs or
the vortex induced motions observed in many offshore systems remain a subject
of considerable interest and practical importance. In this study the role of a
varying flow field observed in the towing of a steel catenary riser model on the
analysis of the measured flow induced vibration phenomena is investigated.
More specifically, in this study the variation of the current flow field that begins
at or near zero and increases to a plateau level for the majority of the test run
before tapering off to near zero flow conditions is analyzed. A transformation of
the bi-axial data from Cartesian to Polar coordinates is used as a basis for
interpreting the measurements. By investigating the response of the SCR model
during the flow transition regions together with the region where the response
behaviour appears to be somewhat stabilized, one may gain some insight into
this complex response phenomena and the implications of truncating time series
records in the process of analyses.
Keywords: SCR, catenary riser, model test, Polar coordinate system, autospectral
analysis, Weibull distribution.
1 Introduction
As a whole, the offshore community has directed a great deal of attention upon
developing a better understanding of vortex induced vibrations (VIV) of slender
bodies and the vortex induced motions (VIM) of deepwater platforms [1–4].
Steel catenary risers (SCRs) have become an increasingly important component
in the operation of an increasing number of offshore activities. Consequently,
Keywords
SCR, catenary riser, model test, Polar coordinate system, autospectral
analysis, Weibull distribution.
Related Book
Other papers in this volume
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