0
Offshore Technology

Assessing the Dynamic Stability of an Offshore Supply Vessel

[+] Author and Article Information
Vladimir Shigunov, Ould el Moctar, Thomas E. Schellin, Jan Kaufmann

Rasmus Stute

Germanischer Lloyd, Brooktorkai 18, 20457 Hamburg, Germanyrasmus.stute@gl-group.com

J. Offshore Mech. Arct. Eng 134(4), 041302 (May 31, 2012) (10 pages) doi:10.1115/1.4006392 History: Received June 27, 2011; Revised February 02, 2012; Published May 30, 2012; Online May 31, 2012

The dynamic stability of a typical offshore service vessel operating under stability critical operating conditions was investigated. Excessive roll motions and relative motions at the stern were studied for two loading conditions for ship speeds ranging from zero to the design speed. A linear frequency-domain seakeeping analysis was followed by nonlinear time-domain simulations of ship motions in waves. Based on results from these methods, critical scenarios were selected and simulated using finite-volume solvers of the Reynolds-averaged Navier-Stokes equations to understand the phenomena related to dynamically unstable ship motions and to confirm the results of the simpler analysis methods. The results revealed the possibility of excessive roll motions and water run-up on deck; countermeasures such as a ship-specific operational guidance are discussed.

Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Bottom (left) and top (right) views of the OSV

Grahic Jump Location
Figure 2

Roll decay time history from the RANSE simulation

Grahic Jump Location
Figure 3

Roll damping as a percentage of critical damping versus roll amplitude

Grahic Jump Location
Figure 4

Roll amplitude versus wave encounter period for principal parametric resonance in stern quartering waves: GM = 0.88 m, μ = 310 deg, □ experiment, • simulations

Grahic Jump Location
Figure 5

Roll amplitude versus wave encounter period for synchronous rolling in beam waves: GM = 7.50 m, μ = 90 deg, □ experiment, • simulations

Grahic Jump Location
Figure 6

Roll amplitude versus Froude number, Fr; for different wave periods for principal parametric resonance in head waves: GM = 1.26 m, μ = 180 deg, □ experiment, ○ simulations with simulation time and initial conditions adjusted to the test, — simulations with a sufficiently long simulation time and a large initial roll angle

Grahic Jump Location
Figure 7

RAO of the relative motion at the stern of a fully loaded OSV for different ship speeds in 7.9 s period waves

Grahic Jump Location
Figure 8

Roll, heave, pitch, and water on deck for the fully loaded OSV at zero speed in regular following waves with freeing ports closed (—) and open ( ····· )

Grahic Jump Location
Figure 9

Maximum roll amplitudes of the partially loaded OSV in regular (top) and in short-crested irregular (bottom) waves versus wave period and wave direction

Grahic Jump Location
Figure 10

Roll angle time history from the RANSE simulation for scenario 1; principal resonance of the partially loaded OSV at low speed in regular bow waves

Grahic Jump Location
Figure 11

Roll angle time history from the RANSE simulation for scenario 1; principal resonance of the partially loaded OSV at low speed in an irregular head seaway

Grahic Jump Location
Figure 12

Time history of roll motion for scenario 2; fundamental resonance of the partially loaded OSV at medium speed in regular following waves

Grahic Jump Location
Figure 13

Time history of roll motion for scenario 3; fundamental resonance of the partially loaded OSV at a higher speed in regular quartering waves

Grahic Jump Location
Figure 14

Operability limiting wave heights for the bridge (left) and the 1/4 ship length from aft perpendicular (right) of the partially loaded OSV at zero speed

Grahic Jump Location
Figure 15

Operability limiting wave heights for the bridge (left) and the 1/4 ship length from aft perpendicular (right) of the partially loaded OSV at different ship speeds

Tables

Errata

Discussions

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.

Related Journal Articles
Related eBook Content
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