Simulation of Nonlinear Waves Interacting with a Heaving Floating Body using a p-Multigrid Spectral Element Method

Line K. Mortensen, Wojciech Jacek Laskowski, Allan P. Engsig-Karup, Claes Eskilsson, Carlos Monteserin

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Abstract

We present a Spectral Element Fully Nonlinear Potential Flow (FNPF- SEM) model developed for the simulation of wave-body interactions between nonlinear free surface waves and impermeable structures. The solver is accelerated using an iterative p-multigrid algorithm. Two cases are considered: (i) a surface piercing box forced into vertical motion creating radiated waves and (ii) a rectangular box released above its equilibrium resulting in freely decaying heave motion. The FNPF-SEM model is validated by comparing the computed hydrodynamic forces against those obtained by a Navier-Stokes solver. Although not perfect agreement is observed the results are promising, a significant speedup due to the iterative algorithm is however seen.
Original languageEnglish
Title of host publicationProceedings of the Thirty-first (2021) International Ocean and Polar Engineering Conference
PublisherInternational Society of Offshore and Polar Engineers
Publication date2021
Pages1569-1576
ISBN (Print)978-1-880653-82-1
Publication statusPublished - 2021
Event31st International Ocean and Polar Engineering Conference - Rhodes, Greece
Duration: 20 Jun 202125 Jun 2021

Conference

Conference31st International Ocean and Polar Engineering Conference
Country/TerritoryGreece
CityRhodes
Period20/06/202125/06/2021
SeriesProceedings of the International Offshore and Polar Engineering Conference
ISSN1098-6189

Keywords

  • Spectral element method
  • p-multigrid
  • Fully nonlinear potential flow
  • Wave-body interactions
  • Acceleration potential method

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