InfIuence of wave induced second-order forces in semisubmersible fowt mooring design

López Pavón, Carlos and Watai, Rafael A. and Ruggeri, Felipe and Simos, Alexandre N. and Souto Iglesias, Antonio (2013). InfIuence of wave induced second-order forces in semisubmersible fowt mooring design. In: "32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013)", 09/06/2013 - 14/06/2013, Nantes, France. pp. 1-11.

Description

Title: InfIuence of wave induced second-order forces in semisubmersible fowt mooring design
Author/s:
  • López Pavón, Carlos
  • Watai, Rafael A.
  • Ruggeri, Felipe
  • Simos, Alexandre N.
  • Souto Iglesias, Antonio
Item Type: Presentation at Congress or Conference (Article)
Event Title: 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013)
Event Dates: 09/06/2013 - 14/06/2013
Event Location: Nantes, France
Title of Book: Proceedings of the ASME 2013
Date: 2013
Subjects:
Freetext Keywords: Floating offshore wind turbine (FOWT), semisubmersible, mooring design, slow-drift forces, captive model tests, bichromatic waves
Faculty: E.T.S.I. Navales (UPM)
Department: Enseñanzas Básicas de la Ingeniería Naval [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The main focus of this paper is on hydrodynamic modelling of a semisubmersible platform (which can support a 1.5MW wind turbine and is composed by three buoyant columns connected by bracings) with especial emphasis on the estimation of the wave drift components and their effects on the design of the mooring system. Indeed, with natural periods of drift around 60 seconds, accurate computation of the low-frequency second-order components is not a straightforward task. As methods usually adopted when dealing with the slow-drifts of deep-water moored systems, such as Newman?s approximation, have their errors increased by the relatively low resonant periods, and as the effects of depth cannot be ignored, the wave diffraction analysis must be based on full Quadratic Transfer Functions (QTF) computations. A discussion on the numerical aspects of performing such computations is presented, making use of the second-order module available with the seakeeping software WAMIT®. Finally, the paper also provides a preliminary verification of the accuracy of the numerical predictions based on the results obtained in a series of model tests with the structure fixed in bichromatic waves.

More information

Item ID: 25778
DC Identifier: http://oa.upm.es/25778/
OAI Identifier: oai:oa.upm.es:25778
Deposited by: Memoria Investigacion
Deposited on: 16 May 2015 07:44
Last Modified: 16 May 2015 07:44
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