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Abstract A two MW floating offshore wind turbine is currently developed within the EU-FP7 project FLOATGEN. A wave tank test of the floater model at 1/32th scale has been performed in extreme wave conditions. In the present study numerical calculations of the floating foundation with regular waves using coupled MBS-CFD methods are compared to experimental data enabling a validation. Results of the wave elevation, floater motion and mooring line tension show a very good correlation. Flow phenomena like vortex shedding at the hull of the floater are shown. The presented methodology provides detailed knowledge allowing analysis of wave impact and resulting load assessment of floating offshore structures.
- Europe > Germany (0.29)
- North America > United States (0.29)
- Europe > Norway (0.29)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Platform design (0.94)
- Facilities Design, Construction and Operation > Facilities and Construction Project Management > Offshore projects planning and execution (0.94)
- Health, Safety, Environment & Sustainability > Sustainability/Social Responsibility > Sustainable development (0.88)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Mooring systems (0.71)
A Validation Method for Fluid-Structure-Interaction Simulations Based on Submerged Free Decay Experiments
Arnold, Matthias (University Stuttgart) | Kretschmer, Matthias (University Stuttgart) | Koch, Jonas (University Stuttgart) | Cheng, Po Wen (University Stuttgart) | Biskup, Frank (Voith Hydro Ocean Current Technologies GmbH & Co.)
Abstract Prior to using any simulation method for load simulations, it is required to verify and validate it. However, it is not only enough to find a discrepancy between the model and the reference data, but it is also required to identify the section within the code responsible for any bugs. Therefore the aim of this paper is to present a set of basic validation cases to be used in Fluid-Structure-Interaction (FSI) simulations. By splitting the FSI method up into its key functionalities of forces, torques, translations, rotations, etc., each part of the coupling can be validated by itself with a specific case. Each of the cases consists of a free decay pendulum in water. To gain experimental reference data, the cases are set up in a water basin and the motion over time is recorded by an optical measurement system. In a second step the validation cases are set up in a Fluid-Multibody FSI code and simulated. The motions from numerical simulation and experiment are compared and used to draw a conclusion on the integrity of the experimental data presented and the validity of the tested FSI code.
Abstract In this work a collective pitch feedforward controller for floating wind turbines is presented. The feedforward controller provides a pitch rate update to a conventional feedback controller based on a wind speed preview. The controller is designed similar to the one for onshore turbines, which has proven its capability to improve wind turbine control performance in field tests. In a first design step, perfect wind preview and a calm sea is assumed. Under these assumptions the feedforward controller is able to compensate almost perfectly the effect of changing wind speed to the rotor speed of a full nonlinear model over the entire full load region. In a second step, a nacelle-based lidar is simulated scanning the same wind field which is used also for the aero-hydro-servo-elastic simulation. With model-based wind field reconstruction methods, the rotor effective wind speed is estimated from the raw lidar data and is used in the feedforward controller after filtering out the uncorrelated frequencies. Simulation results show that even with a more realistic wind preview, the feedforward controller is able to significantly reduce rotor speed and power variations. Furthermore, structural loads on the tower, rotor shaft, and blades are decreased. A comparison to a theoretical investigation shows that the reduction in rotor speed regulation is close to the optimum.
- Europe (1.00)
- North America > United States > Colorado (0.28)
- Research Report > New Finding (0.34)
- Research Report > Experimental Study (0.34)
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Health, Safety, Environment & Sustainability > Sustainability/Social Responsibility > Sustainable development (0.72)
- Health, Safety, Environment & Sustainability > Environment (0.72)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems (0.68)