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Barge motions in random seas – a comparison of theory and experiment

Published online by Cambridge University Press:  20 April 2006

D. T. Brown ,
R. Eatock Taylor  and
M. H. Patel
D. T. Brown
Affiliation:
London Centre for Marine Technology, Department of Mechanical Engineering. University College London
R. Eatock Taylor
Affiliation:
London Centre for Marine Technology, Department of Mechanical Engineering. University College London
M. H. Patel
Affiliation:
London Centre for Marine Technology, Department of Mechanical Engineering. University College London
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Abstract

This paper describes a comparison of experimental data and theoretical results for the motions in waves of large flat-bottomed barges having zero forward speed. The experimental data are derived from model tests at two scales (1:36 and 1:108). These consist of measurements of motions in surge, sway, heave, roll, pitch and yaw to long-crested seas approaching the barge models at two orientation angles (head and beam seas). The experimental data are compared with results computed from linearized potential-flow theory, which accounts for the diffraction and radiation of gravity waves around the barge. The boundary-integral scheme employed to solve this potential-flow problem is briefly reviewed.

The experimental data at two scales and the theoretical results show that potential-flow theory is in reasonable agreement with experimental data for all motions except roll near resonance. These roll-motion discrepancies, due to vortex shedding from bilge-keel edges, are discussed. Some of the observable effects of scale in the model tests are highlighted.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 129 , April 1983 , pp. 385 - 407
Copyright
© 1983 Cambridge University Press

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