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Adaptive simulation of unsteady flow past the submerged part of a floating wind turbine platform
KTH, School of Computer Science and Communication (CSC), High Performance Computing and Visualization (HPCViz). Basque Center for Applied Mathematics, Spain.
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2015 (English)In: MARINE 2015 - Computational Methods in Marine Engineering VI, International Center for Numerical Methods in Engineering (CIMNE), 2015, 35-46 p.Conference paper (Refereed)
Abstract [en]

Offshore floating platforms for wind turbines represent challenging concepts for designers trying to combine an optimal compromise between cost effectiveness and performance. Modelling of the hydrodynamic behaviour of the structure is still the subject of wide debate in the technical communities. The assessment of the hydrodynamics of the support structure is not an easy task as the floaters consist of an assembly of columns, braces and pontoons, commonly also with heave plates: Each of these components corresponds to a different hydrodynamic model and it further interacts with the other elements. This results in very complex non-linear modeling, which makes it necessary to resort to computational fluid dynamics (CFD) methods for the evaluation of the combined hydrodynamics. In the framework of the collaboration between the Basque Centre for Applied Mathematics (BCAM) and Tecnalia R&I, the interaction of the sea flow with a semisubmersible floating offshore wind platform have been calculated by using the open source solver Unicorn in the FEniCS-HPC framework when subject to a steady inflow. The prototype of the platform consists in a semi-submersible 4-columns column stabilized platform - NAUTILUS Floating Solutions concept-; columns are connected by a rigid ring pontoon provided with heave damping plates at the bottom. The novelty of the approach in FEniCS-HPC hinges upon an implicit formulation for the turbulence, a cheap free slip model of the boundary layer and goal-oriented mesh adaptivity [8, 6, 9, 20, 1]. We find that the results are consistent with experimental results for cylinders at high Reynolds number.

Place, publisher, year, edition, pages
International Center for Numerical Methods in Engineering (CIMNE), 2015. 35-46 p.
Keyword [en]
Adaptive, FEM, Marine engineering, Turbulence, Atmospheric thermodynamics, Boundary layers, Computational methods, Cost effectiveness, Finite element method, Fluid dynamics, Hydrodynamics, Plates (structural components), Pontoons, Reynolds number, Semisubmersibles, Wind turbines, Adaptive simulation, Applied mathematics, Computational fluid dynamics methods, Floating wind turbines, High Reynolds number, Implicit formulation, Stabilized platform, Computational fluid dynamics
National Category
Marine Engineering Computational Mathematics
URN: urn:nbn:se:kth:diva-177229ISI: 000380489300002ScopusID: 2-s2.0-84938865712ISBN: 9788494392863OAI: diva2:873904
6th International Conference on Computational Methods in Marine Engineering, MARINE 2015, 15 June 2015 through 17 June 2015

QC 20151125

Available from: 2015-11-25 Created: 2015-11-17 Last updated: 2016-09-02Bibliographically approved

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Jansson, JohanDe Abreu, Rodrigo VilelaHoffman, Johan
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