Ocean Engineering

Vortex-Induced Vibration and Coincident Current Velocity Profiles for a Deepwater Drilling Riser

[+] Author and Article Information
T. Srivilairit

 Bechtel Corporation, Houston, TX 77056tsrivila@bechtel.com

L. Manuel

Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Austin, TX 78712lmanuel@mail.utexas.edu

J. Offshore Mech. Arct. Eng 131(2), 021101 (Feb 26, 2009) (11 pages) doi:10.1115/1.3058684 History: Received June 27, 2007; Revised September 07, 2008; Published February 26, 2009

The objective of this study is to use full-scale field data on current velocities and riser motions to better understand the behavior of deepwater drilling risers. The data are comprised of riser accelerations and coincident current velocity profiles from the monitoring of vortex-induced vibration (VIV) of a drilling riser located at a 1000 m water depth site. Proper orthogonal decomposition (POD), an efficient numerical technique for characterizing the spatial coherence in a random field, is employed here to identify energetic current profiles. The accuracy resulting from the use of only a limited number of the most important POD modes is studied by comparing measured current velocity profiles with those reconstructed based on a reduced-order truncation. In addition to studying current velocity profiles, riser acceleration data from this deepwater drilling riser are also analyzed. In order to analyze the VIV response of this riser, in-line and cross-flow motions in different data segments are studied. Again, empirical POD procedures are employed—this time to derive energetic spatial vibration modes defining the riser motion. Importantly, these modes are identified without the need for either an analytical/computational model of the riser or any physical dimensions and material properties; instead, they are derived exclusively using the field data. Relationships between riser response and coincident current velocity profiles are investigated, especially for those data segments associated with observed lock-in response.

Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 8

Welch power spectra of rotated accelerations at nine loggers in the cross-flow (Y′) and in-line (X′) directions

Grahic Jump Location
Figure 1

Locations of (a) current velocity measurement units and (b) riser acceleration loggers

Grahic Jump Location
Figure 2

Histogram of current speed magnitudes at different measurement vertical levels along the depth

Grahic Jump Location
Figure 3

Circular histograms of current directions in (a) the upper 500 m and (b) the lower 500 m

Grahic Jump Location
Figure 9

The first three POD mode shapes of cross-flow riser displacements

Grahic Jump Location
Figure 10

Current profiles, riser and vessel rms displacements, and dominant current and riser response directions

Grahic Jump Location
Figure 7

Actual and POD-based correlation coefficient estimates between current components at various depths

Grahic Jump Location
Figure 11

First three POD mode shapes of current velocity for (a) components in the 0 deg and 90 deg directions and (b) resultant and associated direction

Grahic Jump Location
Figure 4

First five POD modes of the current velocity for the entire data set

Grahic Jump Location
Figure 5

Variance of the current field at different levels based on reconstruction using different numbers of POD modes

Grahic Jump Location
Figure 6

Measured and reconstructed (using three POD modes) current velocity profiles over the 2 month monitoring period



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In