Spectral element FNPF simulation of focused wave groups impacting a fixed FPSO

Allan P. Engsig-Karup, Claes Eskilsson

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationThe Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference : ISOPE2018
EditorsJin S. Chung, Beom-Soo Hyun, Dmitri Matskevitch, Alan M. Wang
Number of pages8
Volume1
PublisherInternational Society of Offshore & Polar Engineers
Publication date2018
Pages1443-1450
ISBN (Print)978-1-880653-87-6
Publication statusPublished - 2018
EventThe 28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Royton Sapporo Hotel, Sapporo (Hokkaido), Japan
Duration: 10 Jun 201815 Jun 2018
Conference number: 28

Conference

ConferenceThe 28th International Ocean and Polar Engineering Conference, ISOPE 2018
Number28
LocationRoyton Sapporo Hotel
CountryJapan
CitySapporo (Hokkaido)
Period10/06/201815/06/2018
SeriesProceedings of the International Offshore and Polar Engineering Conference
Number28
ISSN1098-6189

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Keywords

  • Spectral element method
  • High order numerical methods
  • Unstructured meshes
  • Fully nonlinear potential flow
  • Focused wave
  • Wave-body interaction
  • FPSO

Cite this

Engsig-Karup, A. P., & Eskilsson, C. (2018). Spectral element FNPF simulation of focused wave groups impacting a fixed FPSO. In J. S. Chung, B-S. Hyun, D. Matskevitch, & A. M. Wang (Eds.), The Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference: ISOPE2018 (Vol. 1, pp. 1443-1450). International Society of Offshore & Polar Engineers. Proceedings of the International Offshore and Polar Engineering Conference, No. 28