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Spectral element FNPF simulations of focused wave groups impacting a fixed FPSO
DTU Technical University of Denmark, Denmark.
RISE - Research Institutes of Sweden, Safety and Transport, Safety. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
2018 (English)In: Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference, The International Society of Offshore and Polar Engineering , 2018, p. 1443-1450Conference paper, Published paper (Refereed)
Abstract [en]

For  the assessment of experimental measurements of focused wave groups impacting a surface-piecing fixed structure, we present a new Fully Nonlinear Potential Flow (FNPF) model for simulation of unsteady water waves. The FNPF model is discretized in three  spatial dimensions (3D) using high-order prismatic - possibly curvilinear - elements using a  spectral  element  method (SEM) that has support for adaptive unstructured meshes. This  SEM-FNPF model is based on an Eulerian formulation and deviates from past works in that a  direct discretization of the Laplace problem is used making it straightforward to handle  accurately floating structural bodies of arbitrary shape. Our objectives are; i) present detail of a new SEM modelling developments and ii) to consider its application to address a wave-body interaction problem for nonlinear design waves and their interaction with a model-scale fixed Floating Production, Storage and Offloading vessel (FPSO).  We first reproduce  experimental measurements for focused design waves that represent a probably extreme  wave event for a sea state represented by a wave spectrum and seek to reproduce these measurements in a numerical wave tank. The validated input signal based on measurements is then generated in a NWT setup that includes the FPSO and differences in the signal caused by nonlinear diffraction is reported.

Place, publisher, year, edition, pages
The International Society of Offshore and Polar Engineering , 2018. p. 1443-1450
Keywords [en]
Spectral element method, high order numerical methods, unstructured meshes, fully nonlinear potential flow, focused wave, wave-body interaction, FPSO
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-35961DOI: 10.17736/ijope.2019.jc753Scopus ID: 2-s2.0-85053448260ISBN: 978-1-880653-87-6 (electronic)OAI: oai:DiVA.org:ri-35961DiVA, id: diva2:1261241
Conference
the Twenty-eighth (2018) International Ocean and Polar Engineering Conference
Funder
Swedish Energy Agency, P41125-1Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-08-09Bibliographically approved

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  • apa
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