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The influence of forward speed on ship motions in abnormal waves: experimental measurements and numerical predictions

The influence of forward speed on ship motions in abnormal waves: experimental measurements and numerical predictions
The influence of forward speed on ship motions in abnormal waves: experimental measurements and numerical predictions
Ship encounters with abnormal waves are increasingly well documented and it is therefore important to be able to model such encounters in order to assess the risks involved and whether there is a requirement for more stringent design rules.

This paper presents the results of an experimental investigation into the influence of abnormal waves on a vessel travelling with forward speed in irregular seas. The vessel studied in this case is a naval frigate travelling at a range of speeds. To put the motions measured in abnormal waves into context comparisons are made to those in random seas with a variety of significant wave heights, both non-severe and severe. A further objective is to compare experimental measurements with motion predictions from both a two-dimensional linear strip theory and a three-dimensional partly nonlinear seakeeping model.

Results demonstrate that abnormal waves may not necessarily be the worst conditions that a ship can encounter. However, accelerations derived from the rigid body motions appear to be in excess of rules values. This has implications for design due to the unexpected nature of abnormal wave occurrence and the consequent likelihood of encountering such a wave at a higher speed (hence in a more severe operating condition) than a random sea of an equivalent height.

The three-dimensional partly nonlinear model demonstrates improved agreement with experimental measurements of rigid body motions, compared to the two-dimensional strip theory. It is therefore considered to have greater potential as a design tool for abnormal wave encounters. Further validation with a wide range of sea states and vessel types is required.


abnormal waves, rogue waves, wave-vessel interactions, forward speed, experiments, motions
0889-9746
154-172
Bennett, S.S.
6c2fda55-1416-4cfa-ab39-9f6eea640b95
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf
Bennett, S.S.
6c2fda55-1416-4cfa-ab39-9f6eea640b95
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf

Bennett, S.S., Hudson, D.A. and Temarel, P. (2013) The influence of forward speed on ship motions in abnormal waves: experimental measurements and numerical predictions. Journal of Fluids and Structures, 39, 154-172. (doi:10.1016/j.jfluidstructs.2013.01.006).

Record type: Article

Abstract

Ship encounters with abnormal waves are increasingly well documented and it is therefore important to be able to model such encounters in order to assess the risks involved and whether there is a requirement for more stringent design rules.

This paper presents the results of an experimental investigation into the influence of abnormal waves on a vessel travelling with forward speed in irregular seas. The vessel studied in this case is a naval frigate travelling at a range of speeds. To put the motions measured in abnormal waves into context comparisons are made to those in random seas with a variety of significant wave heights, both non-severe and severe. A further objective is to compare experimental measurements with motion predictions from both a two-dimensional linear strip theory and a three-dimensional partly nonlinear seakeeping model.

Results demonstrate that abnormal waves may not necessarily be the worst conditions that a ship can encounter. However, accelerations derived from the rigid body motions appear to be in excess of rules values. This has implications for design due to the unexpected nature of abnormal wave occurrence and the consequent likelihood of encountering such a wave at a higher speed (hence in a more severe operating condition) than a random sea of an equivalent height.

The three-dimensional partly nonlinear model demonstrates improved agreement with experimental measurements of rigid body motions, compared to the two-dimensional strip theory. It is therefore considered to have greater potential as a design tool for abnormal wave encounters. Further validation with a wide range of sea states and vessel types is required.


Full text not available from this repository.

More information

e-pub ahead of print date: 22 February 2013
Published date: May 2013
Keywords: abnormal waves, rogue waves, wave-vessel interactions, forward speed, experiments, motions
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 350371
URI: https://eprints.soton.ac.uk/id/eprint/350371
ISSN: 0889-9746
PURE UUID: 7ffb34f1-9a47-4624-bbbd-8f504a948aa7
ORCID for D.A. Hudson: ORCID iD orcid.org/0000-0002-2012-6255
ORCID for P. Temarel: ORCID iD orcid.org/0000-0003-2921-1242

Catalogue record

Date deposited: 26 Mar 2013 09:53
Last modified: 06 Jun 2018 13:07

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