Abstract
A coupled floating body-mooring line model is developed by combining a boundary element model for a two-dimensional floating body and a catenary mooring line model. The boundary element model is formulated in the time domain by a continuous Rankine source, and a reflection potential is introduced to account for the wave reflection due to sloping seabed. This newly developed model is validated by comparisons against available data. Then, dynamic response analyses are performed for the moored body in various seabed conditions. Compared with a flat seabed, a sloping seabed causes unsymmetrical mooring line configuration and generates noticeable effects in the motion responses of the floating body.
Highlights
Many types of offshore structures, including floating islands [1], floating shelters [2], floating wind turbines [3], floating wave energy converters [4] and floating offshore fish farms [5], are moored in complicated coastal environments
Accurate predictions of dynamic responses are of practical importance for the design and manufacture of these offshore structures
Previous researches suggest that shallow waters can excite larger responses of offshore structures under hydrodynamic loading because of the flat seabed effects [6,7,8]
Summary
Many types of offshore structures, including floating islands [1], floating shelters [2], floating wind turbines [3], floating wave energy converters [4] and floating offshore fish farms [5], are moored in complicated coastal environments. [13] coupled a Rankine source model to the Boussinesq equation, which supplies all relevant information concerning the fluid domain They reported that the peak frequency of the exciting forces and motion responses are shifted ahead due to the sloping seabed effects. The numerical study shows that the sloping seabed significantly changes the fluid domain and mooring line profile and results in noticeable effects on the dynamic responses of the coupled floating body-mooring line system. These effects vary under different sloping seabed with asymmetrical mooring lines conditions compared with the flat seabed case. The investigation of vortices on the mooring line and body motion is out of the scope of the present study
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