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Nonlinear Wave Scattering From a Single Surface-Piercing Column Comparison With Second-Order Theory

[+] Author Affiliations
Stephen Masterton, Hermione van Zutphen

Shell International Exploration & Production B. V., Rijswijk, The Netherlands

Chris Swan

Imperial College London, London, UK

Paper No. OMAE2007-29201, pp. 427-436; 10 pages
doi:10.1115/OMAE2007-29201
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 4: Materials Technology; Ocean Engineering
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4270-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME

abstract

This paper concerns nonlinear wave scattering from large surface-piercing columns. The motivation behind this study has principally arisen due to a number of operational problems observed on large volume structures, particularly, the loss of effective air-gap. The present study builds on recent observations of nonlinear wave scattering fully reported in (1). These observations are significant since they arise in a flow regime where no significant scattering is expected. The present paper extends these observations by considering two larger, practically important, column sizes; the largest lying just outside the linear diffraction regime, D/λ≥0.2 (where D is the column diameter and λ is the incident wavelength). Experimental observations are compared to second-order theory calculated using an industry standard panel method, WAMIT. Across the full range of column size the presence of the unexpected nonlinear scattering mechanisms reported by (1) is clearly demonstrated. However, their significance reduces with increasing column size. As a consequence the second-order prediction is shown to improve for the larger column sizes and for the largest cases the comparison with the measured data demonstrates excellent agreement. This latter aspect being important considering the steepness of the incident wave (Ak = 0.3) where typically the convergence of a truncated diffraction solution may be questioned.

Copyright © 2007 by ASME

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