Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Vortex-Induced Motion of a Multicolumn Floating Offshore Wind Turbine Platform: a study comparing two modelling approaches - CFD and a Reduced Order Model
Submission Author:
Éverton Lins de Oliveira , SP
Co-Authors:
André Scopel, Éverton Lins de Oliveira, Bruno Carmo, CELSO Pupo Pesce
Presenter: CELSO Pupo Pesce
doi://10.26678/ABCM.COBEM2023.COB2023-1968
Abstract
The aim of this paper is to model the hydrodynamic behavior of a moored FOWT – Floating Offshore Wind Turbine platform - under a constant current flow, considering the motions in the horizontal plane only. The investigated floating unity is a multicolumn platform with the wind turbine mounted over one of the columns. Two modelling approaches are compared to experimental data, obtained with small-scale models, to access their validity, advantages, disadvantages, and usage. The first approach, the ROM, considers the hydrodynamic forces caused by the current represented with phenomenological models - wake oscillators based on forced van der Pol equations, where the adopted Strouhal numbers consider the aspect ratio of the columns. The CFD approach considers a time-dependent two-dimensional model, employing finite volume discretization applied to a URANS formulation which uses the k-omega SST turbulence closure model. The numerical model is built considering the platform as a rigid body and using a deformable mesh. Both approaches are calculated assuming average Reynolds numbers between 8000 and 70000, in the model scale, and reduced velocities between 3 and 24. Guided by the experimental tests, the resulting dynamic behaviors are compared, and conclusions are drawn about the efficiency, strengths, and limitations of the proposed approaches, assessing them as potential design tools.
Keywords
vortex induced motions, Floating offshore wind turbines, reduced order model, Phenomenological Models, forced van der Pol equation, Computational fluid dynamics (CFD), URANS, small scale experiments
