Assessment of the Importance of Mooring Dynamics on the Global Response of the DeepCwind Floating Semisubmersible Offshore Wind Turbine

Marco Masciola, Amy Robertson, Jason Jonkman, Alexander Coulling, Andrew Goupee

Research output: Contribution to conferencePaperpeer-review

65 Scopus Citations

Abstract

This paper studies the influence of mooring line dynamics on the response of a coupled floating offshore wind turbine against an equivalent uncoupled model. The semisubmersible modeled in this paper is based on a design developed by the DeepCwind program and uses the National Renewable Energy Laboratorys (NRELs) 5-megawatt (MW) baseline wind turbine to represent the tower, nacelle, and blade properties. The uncoupled model was formed using FAST, an open-source program that models the wind turbine aerodynamics, control, motion, tower/blade flexure, and wave forces, but with the mooring line forces treated using a quasi-static approximation. In contrast, the coupled model was enabled by pairing FAST with OrcaFlex. OrcaFlex replaces FASTs wave force and quasi-static cable model with an equivalent subsea fluid-structure representation and a lumped-mass cable system to capture the mooring line dynamics. This analysis revealed that an uncoupled model using the quasi-static mooring approximation can underestimate peak mooring line loads versus a coupled model using a dynamic mooring line.

Original languageAmerican English
Pages359-368
Number of pages10
StatePublished - 2013
Event23rd International Offshore and Polar Engineering Conference, ISOPE 2013 - Anchorage, AK, United States
Duration: 30 Jun 20135 Jul 2013

Conference

Conference23rd International Offshore and Polar Engineering Conference, ISOPE 2013
Country/TerritoryUnited States
CityAnchorage, AK
Period30/06/135/07/13

NREL Publication Number

  • NREL/CP-5000-57869

Keywords

  • coupled analysis
  • floating wind turbine
  • mooring dynamics
  • semisubmesible

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