Abstract
The hydrodynamic performance of the floating foundation for offshore wind turbines is essential to its stability and energy harvesting. A semi-submersible platform with an integral heave plate is proposed in order to reduce the vertical motion responses. In this study, we compare the heave, pitch, and roll free decay motions of the new platform with a WindFloat-type platform based on Reynolds-Averaged Navier-Stokes simulations. The differences of the linear and quadratic damping properties between these platforms are revealed. Then, a FAST (Fatigue, Aerodynamics, Structures, and Turbulence) model with the consideration of fluid viscosity effects is set up to investigate the performance of the new platform under storm and operational conditions. The time-domain responses, motion spectra, and the mooring-tension statistics of these two platforms are evaluated. It is found that the integral heave plate can increase the viscous hydrodynamic damping, significantly decrease the heave and pitch motion responses, and increase the safety of the mooring cables, especially for the storm condition.
Highlights
With environmental pollution worsening and rise in depletion of non-renewable energy, clean and environmental renewable energies are of wide concern
Though several studies take into account the effect of the heave plate on hydrodynamics and the variational aerodynamic loads on rotor while simulating the dynamic response of the Floating Offshore Wind Turbine (FOWT) system, they mainly focus on the traditional oil and gas Spar platform, the load characteristic of which is quite different from that of the FOWT semi-submersible platform
FOWT system, two modules,load, AeroDyn are invoked in FAST. the AeroDyn is used for the of aerodynamic and itand adopts the HydroDyn, are invoked in AeroDyn is used for the calculation of aerodynamic load, and it and blade element momentum theory (BEM) and the generalized dynamic wake theory (GDW), adopts the blade element momentum theory (BEM) and the generalized dynamic wake theory (GDW), considers the dynamic stall correction
Summary
With environmental pollution worsening and rise in depletion of non-renewable energy, clean and environmental renewable energies are of wide concern. Li et al used a combinational method of NREL FAST, and WADAM to study hydrodynamic modelling for an offshore wind turbine, with emphasis on the computation of second-order difference-frequency wave forces and their effects on the global rigid-body motion response [13]. Though several studies take into account the effect of the heave plate on hydrodynamics and the variational aerodynamic loads on rotor while simulating the dynamic response of the FOWT system, they mainly focus on the traditional oil and gas Spar platform, the load characteristic of which is quite different from that of the FOWT semi-submersible platform. The heave, pitch, and roll-decay motion of the two platforms are simulated in the way of STAR-CCM+ to account for the viscous effects of the heave plate We obtain their hydrodynamic coefficients by using the potential-theory based model, WADAM. A comparison of the results of the HexaSemi and WindFloat-type platform is made to assess the performance and feasibility of the new proposed integral heave plate
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