Strip method for a laterally drifting ship in waves

Lateral drift occurs due to the effects of wind forces, wave drifting forces, or both on ships sailing in actual seas. It is important therefore to investigate the influence of lateral drift on seakeeping performance for improved ship operation. The velocity potential was expanded as an asymptotic p...

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Bibliographic Details
Published in:Journal of marine science and technology 2007-09, Vol.12 (3), p.139-149
Main Authors: Adnan, Faizul Amri, Yasukawa, Hironori
Format: Article
Language:English
Subjects:
Acceleration
Asymptotic properties
Design engineering
Drift
Marine
Mathematical analysis
Naval engineering
Seakeeping
Ships
Strip
Surges
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Summary:Lateral drift occurs due to the effects of wind forces, wave drifting forces, or both on ships sailing in actual seas. It is important therefore to investigate the influence of lateral drift on seakeeping performance for improved ship operation. The velocity potential was expanded as an asymptotic power series in terms of the lateral speed parameter, t, defined as w sub(e) V sub(0)/g, where w sub(e) is the frequency of wave encounter; V sub(0) denotes the lateral velocity, which is assumed to be sufficiently small; and g is the acceleration due to gravity. By combining this technique with the strip method, two sets of motion equations of all the hydrodynamic force coefficients for ship seakeeping were derived. The first set is for ships without lateral drift and is the same as the equations in the new strip method, and the second set is for the additional motions induced by lateral drift. It was found that all ship motion modes except surge are coupled when a ship drifts laterally in waves.
ISSN:0948-4280
1437-8213
DOI:10.1007/s00773-007-0224-2