Hydrodynamics of the wind float OC3-Hywind with mooring loads estimated by the modular system

In this research, a modular system is preliminarily developed to estimate motion responses of wind floats with the quasi-static mooring loads in waves. The modular system consists of the hydrodynamic simulator and the BEM (Boundary Element Method) solver based on the 3D source-distribution method. Specifically, the hydrodynamic simulator can be divided into three modules, including body element module, constraint module and global reference frame module, respectively. Subsequently, an indicator, Response Amplitude Operator (RAO), is suggested to present the resonance frequencies of wind floats for determining stability and safety in the operational sea state. In addition, it can be used to realize the contribution of the mooring load to the six Degree-of-Freedom (6 DOF) motions at the resonance frequency, and be considered as the design concept of mooring lines. In case of the mooring load, our model results are reasonably in agreement with other published data of numerical simulations. Eventually, a modular system developed by the software, Simulink, would be compared to the present hydrodynamic models for verifying its capability.

[1]  Morten Thøtt Andersen,et al.  Influence of Model Simplifications Excitation Force in Surge for a Floating Foundation for Offshore Wind Turbines , 2015 .

[2]  Jason Jonkman,et al.  Definition of the Floating System for Phase IV of OC3 , 2010 .

[3]  J. R. Morison,et al.  The Force Exerted by Surface Waves on Piles , 1950 .

[4]  Ole Morten Aamo,et al.  Finite Element Modelling of Moored Vessels , 2001 .

[5]  Ming-Chung Fang,et al.  A parametric study of wave loads on trimaran ships traveling in waves , 2008 .

[6]  J. Jonkman,et al.  Offshore Code Comparison Collaboration (OC3) for IEA Wind Task 23 Offshore Wind Technology and Deployment , 2010 .

[7]  Michael J. Lawson,et al.  Development and Demonstration of The WEC-Sim Wave Energy Converter Simulation Tool , 2014 .

[8]  Finn Gunnar Nielsen,et al.  Integrated Dynamic Analysis of Floating Offshore Wind Turbines , 2006 .

[9]  A. Babarit,et al.  Theoretical and numerical aspects of the open source BEM solver NEMOH , 2015 .

[10]  Jun Xu,et al.  CFD Simulation of a Floating Offshore Wind Turbine System Using a Quasi-Static Crowfoot Mooring-Line Model , 2014 .

[11]  Hyunkyoung Shin,et al.  Model Test of the OC3-Hywind Floating Offshore Wind Turbine , 2011 .

[12]  Ho-Hwan Chun,et al.  An experimental study of the effect of mooring systems on the dynamics of a SPAR buoy-type floating offshore wind turbine , 2015 .

[13]  Fabian Wendt,et al.  COER HYDRODYNAMIC MODELING COMPETITION: MODELING THE DYNAMIC RESPONSE OF A FLOATING BODY USING THE WEC-SIM AND FAST SIMULATION TOOLS , 2015 .

[14]  Robert Hooke,et al.  `` Direct Search'' Solution of Numerical and Statistical Problems , 1961, JACM.

[15]  Winnifred R. Jacobs,et al.  PITCHING AND HEAVING MOTIONS OF A SHIP IN REGULAR WAVES , 1957 .

[16]  H. T. Shen,et al.  Numerical Calculation of the Wave Integrals in the Linearized Theory of Water Waves , 1977 .

[17]  E. S. Politis,et al.  Modeling wake effects in large wind farms in complex terrain: the problem, the methods and the issues , 2012 .

[18]  Ming-Chung Fang,et al.  An Integrated Approach for Site Selection of Offshore Wind-Wave Power Production , 2012, IEEE Journal of Oceanic Engineering.

[19]  Yu-Hsien Lin,et al.  Applying the self-tuning fuzzy control with the image detection technique on the obstacle-avoidance for autonomous underwater vehicles , 2015 .

[20]  Jason Jonkman,et al.  Development of Fully Coupled Aeroelastic and Hydrodynamic Models for Offshore Wind Turbines , 2006 .

[21]  Ming-Chung Fang,et al.  The Effect of Side Hull Arrangements on the Motions of the Trimaran Ship in Waves , 2006 .

[22]  Madjid Karimirad.  Stochastic Dynamic Response Analysis of Spar-Type Wind Turbines with Catenary or Taut Mooring Systems , 2011 .

[23]  Jason Jonkman,et al.  Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine , 2007 .

[24]  Torgeir Moan,et al.  Wave- and Wind-Induced Dynamic Response of a Spar-Type Offshore Wind Turbine , 2012 .

[25]  P. K. Taylor,et al.  The Dependence of Sea Surface Roughness on the Height and Steepness of the Waves , 2001 .

[26]  John Grue,et al.  Wave forces on three-dimensional floating bodies with small forward speed , 1991, Journal of Fluid Mechanics.

[27]  Nils Salvesen,et al.  SHIP MOTIONS AND SEA LOADS , 1970 .

[28]  F Noblesse,et al.  NUMERICAL EVALUATION OF THE GREEN FUNCTION OF WATER-WAVE RADIATION AND DIFFRACTION , 1986 .

[29]  Torgeir Moan,et al.  Stochastic Dynamics of Marine Structures: Index , 2012 .