Validation of Hydrodynamic Load Models Using CFD for the OC4-DeepCwind Semisubmersible

Jason Jonkman, Amy Robertson, M.A. Benitz, D.P. Schmidt, M.A. Lackner, G.M. Stewart

Research output: Contribution to conferencePaperpeer-review

39 Scopus Citations

Abstract

Computational fluid dynamics (CFD) simulations were carried out on the OC4-DeepCwind semisubmersible to obtain a better understanding of how to set hydrodynamic coefficients for the structure when using an engineering tool such as FAST to model the system. This study focussed on the drag behavior and the effects of the free surface, free ends and multimember arrangement of the semisubmersible structure. These effects are investigated through code-to-code comparisons and flow visualizations. The implications on mean load predictions from engineering tools are addressed. This study suggests that a variety of geometric factors should be considered when selecting drag coefficients. Furthermore, CFD simulations demonstrate large time-varying loads caused by vortex shedding that FAST's hydro-dynamic module, HydroDyn, does not model. The implications of these oscillatory loads on the fatigue life needs to be addressed.

Original languageAmerican English
Number of pages12
DOIs
StatePublished - 2015
EventASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015 - St. John's, Canada
Duration: 31 May 20155 Jun 2015

Conference

ConferenceASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015
Country/TerritoryCanada
CitySt. John's
Period31/05/155/06/15

Bibliographical note

See NREL/CP-5000-63751 for preprint

NREL Publication Number

  • NREL/CP-5000-65593

Keywords

  • CFD
  • fast
  • HydroDyn
  • model validation
  • OC4-DeepCwind semisubmersible
  • OpenFOAM

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