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Two-dimensional resonant piston-like sloshing in a moonpool

Published online by Cambridge University Press:  07 March 2007

ODD M. FALTINSEN ,
OLAV F. ROGNEBAKKE  and
ALEXANDER N. TIMOKHA
ODD M. FALTINSEN
Affiliation:
Centre for Ships and Ocean Structures, NTNU, N-7491 Trondheim, Norway
OLAV F. ROGNEBAKKE
Affiliation:
Centre for Ships and Ocean Structures, NTNU, N-7491 Trondheim, Norway
ALEXANDER N. TIMOKHA
Affiliation:
Centre for Ships and Ocean Structures, NTNU, N-7491 Trondheim, Norway
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Abstract

This paper presents combined theoretical and experimental studies of the two-dimensional piston-like steady-state motions of a fluid in a moonpool formed by two rectangular hulls (e.g. a dual pontoon or catamaran). Vertical harmonic excitation of the partly submerged structure in calm water is assumed. A high-precision analytically oriented linear-potential-flow method, which captures the singular behaviour of the velocity potential at the corner points of the rectangular structure, is developed. The linear steady-state results are compared with new experimental data and show generally satisfactory agreement. The influence of vortex shedding has been evaluated by using the local discrete-vortex method of Graham (1980). It was shown to be small. Thus, the discrepancy between the theory and experiment may be related to the free-surface nonlinearity.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 575 , March 2007 , pp. 359 - 397
Copyright
Copyright © Cambridge University Press 2007

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Faltinsen appendix

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