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Ship motions in oblique regular waves

Westlake, P.C. and Wilson, P.A. (1998) Ship motions in oblique regular waves , Southampton, UK University of Southampton 89pp. (Ship Science Reports, 104).

Record type: Monograph (Project Report)


The motions/responses of displacement monohulls in oblique regular waves are investigated using a time domain approach. The five significant degrees of freedom are coupled through the equations of motion and solved to yield earth fixed rotational and translational displacements of the body. The coefficients in the equations are obtained using strip theory. As a consequence of this coupling and the forces acting on the body, the hullform cannot be assumed to be symmetric about its centreplane and a multi-parameter conformal mapping technique is developed which permits the transformation of asymmetric sections to a circle. Using this method the mapping of unusual sections such as large bulbous bows and propeller tunnels may be achieved. The added mass and damping values at the frequency of oscillation may then be determined by the definition of a potential for the circle oscillating on the free surface. The transfer functions obtained using this technique broadly agree with other strip theories and indicate significant improvements may be possible through the coupling mechanism and mapping procedures.

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Published date: 20 February 1998
Organisations: Fluid Structure Interactions Group


Local EPrints ID: 51248
ISSN: 0140-3813
PURE UUID: 8cd1069c-95b3-4cb1-8e95-f574ee76b3d0
ORCID for P.A. Wilson: ORCID iD

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Date deposited: 15 May 2008
Last modified: 17 Jul 2017 14:49

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Author: P.C. Westlake
Author: P.A. Wilson ORCID iD

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