Numerical Simulation of Ballast Water Sloshing inside OC4 Floating Offshore Wind Turbine
A floating offshore wind turbine(FOWT)can experience considerable six-degree-of-freedom motions due to waves and wind forces,thus exciting sloshing of ballast water inside the floating foundation,which may disrupt its normal operation.In this paper,sloshing inside the widely known OC4 DeepCwind semi-submersible FOWT subjected to prescribed sinusoidal excitations is investigated numerically using an open-source toolbox of computational fluid dynamics OpenFOAM.Excitation parameters are varied and a series of motion frequencies is simulated.The sloshing performance is analyzed by reducing the diameter of the upper column while keeping the base column unchanged.Results indicate that the maximum sloshing force and surface elevation occur near the natural period of the floating structure.Discrepancies in sloshing forces between adjacent columns are caused mainly by the differences in velocity components,while the sloshing force of the base column is primarily affected by the change in ballast water volume.Additionally,reducing the upper column's diameter can decrease the response of the sloshing force due to the reduction of the velocity component with the increase of ballast water depth.
NETL
NSTL
万方数据
