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Title: Computation of Nonlinear Hydrodynamic Loads on Floating Wind Turbines Using Fluid-Impulse Theory: Preprint

A hydrodynamics computer module was developed for the evaluation of the linear and nonlinear loads on floating wind turbines using a new fluid-impulse formulation for coupling with the FAST program. The recently developed formulation allows the computation of linear and nonlinear loads on floating bodies in the time domain and avoids the computationally intensive evaluation of temporal and nonlinear free-surface problems and efficient methods are derived for its computation. The body instantaneous wetted surface is approximated by a panel mesh and the discretization of the free surface is circumvented by using the Green function. The evaluation of the nonlinear loads is based on explicit expressions derived by the fluid-impulse theory, which can be computed efficiently. Computations are presented of the linear and nonlinear loads on the MIT/NREL tension-leg platform. Comparisons were carried out with frequency-domain linear and second-order methods. Emphasis was placed on modeling accuracy of the magnitude of nonlinear low- and high-frequency wave loads in a sea state. Although fluid-impulse theory is applied to floating wind turbines in this paper, the theory is applicable to other offshore platforms as well.
Authors:
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Publication Date:
OSTI Identifier:
1215123
Report Number(s):
NREL/CP-5000-63697
Resource Type:
Conference
Resource Relation:
Conference: 34th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2015), 31 May - 5 June 2015, St. John's, Newfoundland, Canada
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Contributing Orgs:
Massachusetts Institute of Technology, Cambridge, Massachusetts
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY FLOATING OFFSHORE WIND; HYDRODYNAMICS; FLUID-IMPULSE THEORY; FAST; WAMIT; NREL