Bichromatic Wave Selection for Validation of the Difference-Frequency Transfer Function for the OC6 Validation Campaign: Paper No. IOWTC2019-7572

Nathan Tom, Amy Robertson, Jason Jonkman, Manuela Bohm, Fabian Wendt

Research output: Contribution to conferencePaper

Abstract

The focus of the Offshore Code Comparison Collaboration, Continuation, with Correlation and unCertainity (OC6) project, which operates under the International Energy Agency Wind Task 30, is to refine the accuracy of engineering tools used to design offshore wind turbines. In support of this work, a new validation campaign is being developed that seeks to better understand the nonlinear wave loading that excites floating wind systems at their low-frequency, rigid-body modes in surge and pitch. The validation data will be employed in a three-way validation between simplified engineering tools and higher-fidelity tools, such as computational fluid dynamics (CFD). Irregular wave spectrums, which are traditionally used to examine the nonlinear wave interaction with offshore structures, are too computationally expensive to be simulated in CFD tools, and so we will employ bichromatic wave cases instead. This paper reviews the process used to choose the bichromatic wave pairs to be applied in the campaign to validate the second-order difference-frequency quadratic and potential loads at the surge and pitch natural frequencies of a floating semisubmersible.
Original languageAmerican English
Number of pages12
DOIs
StatePublished - 2019
EventASME 2019 2nd International Offshore Wind Technical Conference - St. Julian's, Malta
Duration: 3 Nov 20196 Nov 2019

Conference

ConferenceASME 2019 2nd International Offshore Wind Technical Conference
CitySt. Julian's, Malta
Period3/11/196/11/19

Bibliographical note

See NREL/CP-5000-73929 for preprint

NREL Publication Number

  • NREL/CP-5000-76148

Keywords

  • bichromatic waves
  • nonlinear hydrodynamics
  • offshore wind
  • second-order difference-frequency

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